Prostho Qs

Regarding the dental surveyor select the incorrect answer:

Y

A dental surveyor is used to determine the path of insertion.

A dental surveyor can be used by the dentist and the technician.

The surveyor is used to determine the maximum convexity of teeth only

It is an essential instrument for proper designing a RPD

Which of the following statements is incorrect regarding guiding planes:

1. They are used to limit the path of insertion. 2. They dont always need to be prepared 3. Guiding plane adjacent to a free end saddle should be 4mm in length 4. Guiding planes are determined at the surveying procedure of the primary cast.

1+2

1+2+3

2+3+4

2+3

3 only

With regard to cast tilting select the correct answer:

N

Tilting the cast should be the first choice for selecting the path of insertion.

Surveying at zero tilt should be performed for every case.

Tilting the cast will always insure the presence of retentive undercuts for clasps.

Tilting the cast cannot eliminate soft tissue undercuts.

None of the above

Which of the following lever systems is considered to be the most damaging to the abutment tooth?

Y

Class I

Class II

Class III

(1) Periodontal ligament fibers are arranged to resist axial forces more effectively than non-axial forces.

(2) Therefore, a Class III RPD is better than a free end saddle RPD in terms of force direction on abutment

teeth.

First statement is___________, second statement is_____________.

Y

correct, correct

false, correct

correct, false

false, false

the retentive tip of the clasp is placed in the middle third to reduce the torquing effect on the abutment

tooth.

Y

False

True

A free-end saddle RPD differs from a bounded saddle RPD in

Y

Support

Indirect retention

Clasp design

Denture base considerations

All of the other choices (above and below)

A periodontally weakened abutment could :

Y

Affect the clasp type

Affect RPD design

Affect RPD support

All of the other choices

All of the following are borders of the buccal shelf area except:

Y

External oblique ridge

Masseter muscle

Retromolar pad

Buccal frenum

The crest of the residual ridge

Regarding retromylohyoid fossa:

Y

It is the key support area in the mandible

It is bounded anteriorly by the superior constrictor muscle

It is bounded laterally by the tongue

It is distal and lateral to the internal oblique ridge

It is not essential for retention

Regarding the genial tubercles:

N

They are the insertion of multiple muscles

They need relief in the denture in the very resorbed ridges

They are almost in the midline of the mandible

They are bony prominences covered by thin soft tissues

All of the above

The distal extension of your lower complete denture could be affected by:

N

The superior constrictor muscle

the palatoglossus muscle

The pterygomandibular raphae

The ramus

All of the above

When considering the clinical scenario known as Combination (Kellys) Syndrome, all of the following are true EXCEPT:

N

This scenario is most commonly associated with a fully edentulous mandibular arch opposed by a

partially edentulous maxillary arch (Kennedy Class I).

It is helpful to maintain maxillary anterior teeth (even as overdenture abutments) to prevent this

clinical scenario from occurring.

This syndrome results mainly from an imbalance in loading and support between the dentate and

edentulous portions of the opposing arches.

This syndrome is a common clinical scenario when the patient is fully edentulous in both arches.

a and c

a and d

b and d

Overdenture abutments are favorable for all of the following reasons, EXCEPT:

Y

They reduce residual ridge resorption

They provide the patient with improved proprioceptive feedback during mastication

They provide the psychological advantage of natural feeling for the patient They provide improved support for the overdenture

None of the other choices (above and below)

Which of the following is TRUE regarding natural overdenture abutment without attachments?

a. Overdenture abutments should passively contact the denture during rest

b. Overdenture abutments should contact the denture only during function c. The height of the abutment should be at the level of the gingiva d. The root canal should always be endodontically treated

N

A+B

B+C

A+C

A+B+C

All of the above

The rate of residual ridge resorption (after the first year of edentulousness is generally greater in the

mandibular residual ridge than the maxillary. How much greater?

Y

2 times greater

3 times greater

4 times greater

5 times greater

The statement is incorrect. The rate of bone resorption in the mandibular residual ridge is the same as

the rate of bone resorption in the maxillary residual ridge

Which of the following clinical situations usually has the poorest prognosis?

N

Maxillary single complete denture opposing full natural mandibular dentition

Maxillary single complete denture opposing mandibular Kennedy Class I RPD

Maxillary single complete denture opposing mandibular Kennedy Class IV RPD

Mandibular single complete denture opposing full natural maxillary dentition

a and b

b an c

Hanau described five factors that affect occlusion in complete dentures. If a patient is to wear a single

complete denture opposing a fully dentate arch and we desire a balanced occlusal scheme, which of the

following factors is it most practical to adjust in the complete denture:

Y

Condylar guidance

Occlusal plane

Cusp height/ angle

Incisal guidance

Compensating curves

When considering the material to use for the artificial teeth in a single complete denture opposing

natural dentition, all of the following statements are true EXCEPT:

N

Acrylic resin artificial teeth bond chemically to the denture base acrylic and are easy to adjust and

reshape.

Although porcelain artificial teeth are difficult to adjust, they have the advantage of causing less wear

(abrasion) to opposing natural teeth than acrylic.

Although cast metal occlusal surfaces can be custom designed to match to opposing natural teeth, the

technique is often expensive and time-consuming.

Amalgam stops are placed in the occlusal surfaces of artificial porcelain teeth to reduce the wear of the porcelain by the natural teeth.

a and c

b and d

If a patient has Combination syndrome it is probable that we will see all of the following EXCEPT: Y

Anterior rotation of the mandible during occlusion (Class III / prognathic relationship)

Papillary hyperplasia of palatal soft tissue

Reduction of the Vertical Dimension of Occlusion

Maxillary anterior residual ridge resorbs and replaced by resilient flabby ridge

Occlusal plane tilts anteroposteriorly: anteriorly upwards and posteriorly downwards

Pendulous overgrowth of the retromolar pads

Epulis Fissuratum in maxillary labial vestibule

According to Monsons Spherical Theory of Occlusion, a number of occlusal landmarks lie on the surface of a 10 cm radius sphere with its center in the region of the glabella. These landmarks include all of

the following EXCEPT:

Y

The labial gingival margins of the mandibular central incisors

The centers of rotation of the mandibular condyles

The cusp tips of the mandibular second molars

Points approximately between the bottom two-thirds and top one-third of the mandibular retromolar

pads

Points approximately at the mesial slope inclines of the mandibular canines

According to Attwood classification of ridges, Class IV is:

Y

Good ridge without extraction.

Immediate post extraction.

Knife edge ridge

Well-rounded ridge form

Negative or concave form.

The most favorable ridge contour for complete denture is:

Y

High ridge with flat crest and parallel sides.

V shaped.

Knife edge.

Flat ridge.

Ridge with multiple spicules.

When making the final impression of the lower edentulous arch, the patient is asked to exert a closing

force while the dentist exerts a downward pressure. This is to activate:

Y

The masseter

The Pterygo mandibular raphe

The Pterygo mandibular raphe and the masseter

Medial Pterygoid and the Pterygomandibular raphe.

The masseter and medial pterygoid.

Once a stable and retentive peripheral seal is achieved and appropriate spacing is incorporated, your

choice of the final impression material for complete denture would be:

Y

addition silicone

polyether.

zinc oxide eugenol.

alginate.

secondary importance and dependant on the dentist preference.

Your impression technique of choice for ridges that equate to Atwood class V and VI is:

Y

Admix

Conventional technique.

Mucostatic impression on the ridge and mucocompressive else where

The final impression is taken with green stick tracing compound. Using the heated spoon-end of a Le Cron carver, the green stick related to the crestal ridge is removed and the related area of the tray is

perforated. Light-body Poly Vinyl Siloxane is injected into the buccal and lingual shelves of the green stick

and the tray is gently inserted in the mouth . This is a description of the impression technique used for : Y

The fibrous (un-employed) posterior mandibular ridge.

Flabby ridge

Atwwod class V lower ridge.

Immediate dentures.

Neutral Zone technique.

With regard to the Neutral Zone technique, when do you record the Vertical Dimension (VD)?

Y

Before the clinical stage of the neutral zone impression.

The VD is recorded at the same visit of recording the neutral zone.

The VD is recorded in a separate visit after recording the neutral zone.

The VD is recorded in the Try-in visit.

Which of the following is LEAST likely to cause a traumatic denture ulcer:

Y

ill-fitting denture

bleb of acrylic (positive) on the fitting surface of a new denture

internal acrylic porosity

premature occlusal contact

food entrapment under a denture

short denture flange

a+c

c+f

b+d

e+f

Which of the following is LEAST likely to cause inflammatory papillary hyperplasia:

Y

relief chamber in the maxillary denture

continuous 24-hour wearing of the denture

ill-fitting denture (combination syndrome)

poor occlusion that causes denture base movement

single mandibular denture

Which of the following is LEAST likely to cause epulis fissuratum:

Y

over-extended flanges of new dentures

continual ridge resorption that allows the denture flanges of existing dentures to dig into the buccal/labial vestibule

inadequate border molding

lack of peripheral seal in the maxillary denture

Which of the following statements is inaccurate:

Y

Type I denture stomatitis (candidosis) presents as a localized simple inflammation or pinpoint

hyperemia

Type II denture stomatitis (candidosis) presents as diffuse erythema involving part of all of the

dentrure covered mucosa

Diagnosis of denture stomatitis (candidosis) can be confirmed by direct smear from the denture and

identification of Candida albicans spores

Denture stomatitis (candidosis) often occurs in patients with predisposing factors such as xerostomia

Which of the following statements regarding angular chielitis is FALSE:

Y

moderately painful fissured encrusted lesions at the commissures of the mouth

associated with increased vertical dimension of occlusion

frequently associated with both Candidal and secondary bacterial (Staphylococcal) infection

often associated with underlying immune dysfunction

infection starts under complete denture prosthesis and spreads via saliva to the skin folds at the angles

of the mouth

Diagnosis of the underlying cause of burning mouth syndrome is difficult and frustrating for the doctor

because there are too many clinical signs.

N

TRUE

FALSE

V-shaped palatal vault is often associated with Class III posterior palatal form leading to improved in peripheral seal in maxillary complete dentures.

N

TRUE

FALSE

It is important not to look at a patients previous ill-fitting dentures, because such dentures will cause us to repeat the same errors in the new dentures.

N

TRUE

FALSE

Impressions for rebasing of existing complete dentures are made without using a closed mouth impression technique. In the final rebased dentures, which of the following error is most likely to occur:

Y

premature occlusal contact on the anterior teeth

premature occlusal contact on the right side of the mouth if the operator is left-handed

premature occlusal contact on the right side of the mouth if the operator is right-handed

premature occlusal contact on the posterior teeth

reduced overall vertical dimension of occlusion

Tissue conditioner can be used both (1) as a functional impression material and (2) to allow the soft tissue to heal before permanent relining and rebasing procedures are performed.

N

TRUE

FALSE

Which of the following statements is FALSE regarding relining and rebasing:

Y

Chairside relining involves the use of zinc-oxide eugenol impression paste

A common problem during relining is correct orientation of the dentures during the impression/

relining procedure

Impressions for relining and rebasing are usually performed using closed-mouth impression techniques

Occlusal pivots may be used to re-establish the correct vertical dimension of occlusion after excessive tooth wear and residual ridge resorption

Maxillary complete dentures require relining only slightly more often than mandibular complete

dentures.

N

TRUE

FALSE


Y

Rebasing is a procedure which involves resurfacing the tissue side of a denture with new base

material to make it fit more accurately

Rebasing is a procedure in which the teeth of the existing teeth are retained

Relining is not a useful procedure when a change in vertical dimension of occlusion is necessary

Immediate dentures usually require a reline within one year of extractions

Mandibular dentures often require a reline every 3 5 years

An edentulous patient has residual ridge undercuts. If alveoplasty surgery is performed, it is advisable

to remove only half of the alveolar bone creating the undercut.

N

TRUE

FALSE

Which of the following statements is TRUE regarding preprosthetic surgery in edentulous patients:

a. Autogenous hydroxyapatite can be used to augment and rebuild a resorbed ridge but may result in migration of the particles

b. Autogenous iliac crest block graft is effective in rebuilding resorbed ridges but may limit interocclusal space

c. Autogenous inferior border rib grafts may be used to augment resorbed mandibles, but may interfere with an ideal occlusal plane

d. Autogenous bone may resorb as much as 80 per cent within the first ten years after grafting

Y

A + B + C + D

B + D

A + B + C

A + B + D

A + D

In Mucosal Advancement Vestibuloplasty, the mucosa of the vestibule is used to line one side of the extended vestibule, and the other side heals by growth of a new epithelial surface.

N

TRUE

FALSE

Which of the following statements is TRUE:

a. Palatal tori should always be removed surgically because they interfere with denture retention b. Hyperplastic tuberosities are easy to remove surgically because they consist of healthy

alveolar bone

c. All other treatment options should be tried before surgically removing inflammatory papillary hyperplasia

d. Surgical removal of palatal tori may result in hematoma formation if a surgical stent is not used

Y

A + B

C + D

B + C + D

A + C

B + D

A patient has a single maxillary denture opposing natural lower anterior teeth and a Kennedy Class I

RPD. The patient has flabby resilient tissue in the anterior maxilla. Which of the following treatment

options would provide the best future prognosis.

Remove the flabby resilient tissue surgically

Place a bone graft and implants in the maxillary anterior region

Extract the lower remaining natural teeth

Remake a new maxillary denture using a special impression technique

Perform vestibuloplasty surgery in the maxaillary labial sulcus

Which of the following is NOT an indication for pre-prosthetic surgery

Y

Pendulous maxillary tuberosities

Pressure on the mental nerve/foramen

Epulis fissuratum that does not respond to non-surgical treatment

Type II denture stomatitis

Unfavorable frenum attachment (close to crest of residual ridge)


Y

Excessive space under overdentures over the gingival margins of abutment teeth may lead to the

development of dead space which may lead to gingival inflammation and hypertrophy Reducing the tooth height creates an unfavorable crown:root ratio for overdenture abutments

Fortunatley, the exposed dentine of overdenture abutments is naturally resistant to caries

Gold copings that cover overdenture abutments are the most effective means to prevent caries in these

abutments

Which of the following are possible problems associated with overdentures?

a. Reduced inter-arch space for the setting of teeth b. Increased labial fullness of the abutments c. Weakening and fracture of the denture base over the abutment d. Recurrent caries of natural overdenture abutments

N

A+B

A+B+D

All of the above

Regarding overdentures, which of the following is TRUE:

N

Canine abutments are the most commonly used overdenture abutments

Incisor overdenture abutments help restore natural labial fullness

Canine abutments may result in over-contoured labial flanges

A + B

B + C

A + C

A + B + C

The rate of residual ridge resorption is generally greater in the mandibular residual ridge than the

maxillary. How much greater?

Y

2 times greater

3 times greater

4 times greater

5 times greater

The statement is incorrect. The rate of bone resorption in the mandibular residual ridge is the same as

the rate of bone resorption in the maxillary residual ridge

Which of the following clinical situations usually has the poorest prognosis?

N





a and b

b an c

Hanau described five factors that affect occlusion in complete dentures. If a patient is to wear a single

complete denture opposing a fully dentate arch and we desire a balanced occlusal scheme, which of the

following factors is it most practical to adjust in the complete denture:

Y

Condylar guidance

Occlusal plane

Cusp height/ angle

Incisal guidance

Compensating curves

When considering the clinical scenario known as Combination (Kellys) Syndrome, all of the following are true EXCEPT:

N

This scenario is most commonly associated with a fully edentulous mandibular arch opposed by a

partially edentulous maxillary arch (Kennedy Class I).

It is helpful to maintain maxillary anterior teeth (even as overdenture abutments) to prevent this

clinical scenario from occurring.

This syndrome results mainly from an imbalance in loading and support between the dentate and

edentulous portions of the opposing arches.

This syndrome is a common clinical scenario when the patient is fully edentulous in both arches.

a and c

a and d

b and d

When considering the material to use for the artificial teeth in a single complete denture opposing

natural dentition, all of the following statements are true EXCEPT:

N

Acrylic resin artificial teeth bond chemically to the polymethyl-methacrylate (PMMA) denture base

and are easy to adjust and reshape.

Although porcelain artificial teeth are difficult to adjust, they have the advantage of causing less wear

(abrasion) to opposing natural teeth than acrylic.

Although cast metal occlusal surfaces can be custom designed to match to opposing natural teeth, the

technique is often expensive and time-consuming.


a and c

b and d

If a patient has Combination syndrome it is probable that we will see all of the following EXCEPT: Y

Anterior rotation of the mandible during occlusion (Class III / prognathic relationship)







According to Monsons Spherical Theory of Occlusion, a number of occlusal landmarks lie on the surface of a 10 cm radius sphere with its center in the region of the glabella. These landmarks include all of

the following EXCEPT:

Y




Points approximately between the bottom two-thirds and top one-third of the mandibular retromolar

pads


According to Attwood classification of ridges, Class IV is:

Y



Knife edge ridge



The most favorable ridge contour for complete denture is:

Y


V shaped.

Knife edge.

Flat ridge.

Ridge with multiple specules.

The retromylohyoid distal extension of the lower denture is limited by all of the following except:

Y

Mylohyoid muscle

Ramus

Buccinator.

Pterygo mandibular raphe.

Superior constrictor.

When making the final impression of the lower edentulous arch, the patient is asked to exert a closing

force while the dentist exerts a downward pressure. This is to activate:

Y

The masseter





Once a stable and retentive peripheral seal is achieved and appropriate spacing is incorporated, your

choice of the final impression material for complete denture would be:

Y

addition silicone

polyether.

zinc oxide eugenol.

alginate.


. Your impression technique of choice for ridges that equate to Atwood class V and VI is:

Y

Admix



The final impression is taken with green stick tracing compound. Using the heated spoon-end of a Le Cron carver, the green stick related to the crestal ridge is removed and the related area of the tray is

perforated. Light-body Poly Vinyl Siloxane is injected into the buccal and lingual shelves of the green stick

and the tray is gently inserted in the mouth . This is a description of the impression technique used for : Y

.The fibrous (un-employed) posterior mandibular ridge.

Flabby ridge


Immediate dentures.


With regard to the Neutral Zone technique, when do you record the Vertical Dimension (VD)?

Y





Which of the following is LEAST likely to cause a traumatic denture ulcer:

Y

ill-fitting denture





Which of the following is LEAST likely to cause inflammatory papillary hyperplasia:

Y






Which of the following is LEAST likely to cause epulis fissuratum:

Y


continual ridge resorption that allows the denture flanges of existing dentures to dig into the buccal/labial vestibule

inadequate border molding

lack of peripher seal in the maxillary denture

Which of the following statements is inaccurate:

Y

Type I denture stomatitis (candidosis) presents as a localized simple inflammation or pinpoint

hyperemia

Type II denture stomatitis (candidosis) presents as diffuse erythema involving part of all of the

dentrure covered mucosa

Diagnosis of denture stomatitis (candidosis) can be confirmed by direct smear from the denture and

identification of Candida albicans spores

Denture stomatitis (candidosis) often occurs in patients with predisposing factors such as xerostomia

Which of the following statement regarding angular chielitis is FALSE:

Y



frequently associated with both Candidal and secondary bacterial (Staphylococcal) infection


infection starts under complete denture prosthesis and spreads via saliva to the skin folds at the angles

of the mouth

All of the following are part of the routine management of denture stomatitis (candidosis), EXCEPT:

Y

correct ill-fitting dentures or fabricate new ones

improve oral and denture hygiene

antifungal therapy

complete surgical excision of infected mucosa

Diagnosis of the underlying cause of burning mouth syndrome is difficult and frustrating for the doctor

because there are too many clinical signs.

N

TRUE

FALSE

Burning mouth syndrome is most common in middle-aged females

N

TRUE

FALSE

V-shaped palatal vault is often associated with Class III posterior palatal form leading to improved in peripheral seal in maxillary complete dentures.

N

TRUE

FALSE

Accordin/g to Houses classification of mental attitude, a Skeptical patient is a patient who seeks treatment because a friend or relative has encouraged them to do so.

N

TRUE

FALSE

It is often more difficult to set complete denture teeth for patients who have had recent extractions than

patients who have been edentulous for several years

N

TRUE

FALSE

It is important not to look at a patients previous ill-fitting dentures, because such dentures will cause us to repeat the same errors in the new dentures.

N

TRUE

FALSE

Impressions for rebasing of existing complete dentures are made without using a closed mouth impression technique. In the final rebased dentures, which of the following error is most likely to occur:

Y


premature occlusal contact on the right side of the mouth if the operator is left-handed

premature occlusal contact on the right side of the mouth if the operator is right-handed



Tissue conditioner can be used both (1) as a functional impression material and (2) to allow the soft tissue to heal before permanent relining and rebasing procedures are performed.

N

TRUE

FALSE


Y


A common problem during relining is correct orientation of the dentures during the impression/

relining procedure



Maxillary complete dentures require relining only slightly more often than mandibular complete

dentures.

N

TRUE

FALSE


Y

Rebasing is a procedure which involves resurfacing the tissue side of a denture with new base

material to make it fit more accurately


Relining is not a useful procedure when a change in vertical dimension of occlusion is necessary



An edentulous patient has residual ridge undercuts. If alveoplasty surgery is performed, it is advisable

to remove only half of the alveolar bone creating the undercut.

N

TRUE

FALSE

Which of the following statements is TRUE regarding preprosthetic surgery in edentulous patients:

e. Autogenous hydroxyapatite can be used to augment and rebuild a resorbed ridge but may result in migration of the particles

f. Autogenous iliac crest block graft is effective in rebuilding resorbed ridges but may limit interocclusal space

g. Autogenous inferior border rib grafts may be used to augment resorbed mandibles, but may interfere with an ideal occlusal plane

h. Autogenous bone may resorb as much as 80 per cent within the first ten years after grafting

Y

A + B + C + D

B + D

A + B + C

A + B + D

A + D

In Mucosal Advancement Vestibuloplasty, the mucosa of the vestibule is used to line one side of the extended vestibule, and the other side heals by growth of a new epithelial surface.

N

TRUE

FALSE


e. Palatal tori should always be removed surgically because they interfere with denture retention f. Hyperplastic tuberosities are easy to remove surgically because they consist of healthy

alveolar bone

g. All other treatment options should be tried before surgically removing inflammatory papillary hyperplasia

h. Surgical removal of palatal tori may result in hematoma formation if a surgical stent is not used

Y

A + B

C + D

B + C + D

A + C

B + D

A patient has a single maxillary denture opposing natural lower anterior teeth and a Kennedy Class I

RPD. The patient has flabby resilient tissue in the anterior maxilla. Which of the following treatment

options would provide the best future prognosis.






Which of the following is NOT an indication for pre-prosthetic surgery

Y







Y

Excessive space under overdentures over the gingival margins of abutment teeth may lead to the

development of dead space which may lead to gingival inflammation and hypertrophy Reducing the tooth height creates an unfavorable crown:root ratio for overdenture abutments

Fortunatley, the exposed dentine of overdenture abutments is naturally resistant to caries

Gold copings that cover overdenture abutments are the most effective means to prevent caries in these

abutments

Which of the following is TRUE regarding natural overdenture abutment without attachments?

e. Overdenture abutments should passively contact the denture during rest f. Overdenture abutments should contact the denture only during function g. The height of the abutment should be at the level of the gingiva h. The root canal should always be endodontically treated

N

A+B

B+C

A+C

A+B+C

All of the above

Which of the following are possible problems associated with overdentures?

e. Reduced inter-arch space for the setting of teeth f. Increased labial fullness of the abutments g. Weakening and fracture of the denture base over the abutment h. Recurrent caries of natural overdenture abutments

N

A+B

A+B+D

All of the above

Regarding overdentures, which of the following is TRUE:

N




A + B

B + C

A + C

A + B + C

Overdenture abutments are favorable for all of the following reasons, EXCEPT:

Y



They provide the psychological advantage of natural feeling for the patient They always provide additional retention for the overdenture

They provide improved support for the overdenture


In which of the following situations is it ethically acceptable to cheat on a Prosthodontics

examination?

N

If the instructor is busy answering another student's question or talking on his mobile phone

If your grades are low and you are afraid of failing

If you can see your neighbor's computer screen clearly

If you didnt study because you thought the exam would be postponed due to snow If the pretty/handsome student next to you smiles at you and asks for help

If you are at the top of your class and you are afraid of dropping to second

If you are second in your class and you want to become first

If you didn't feel like studying last night and watched television instead

None of the above

**4When considering the clinical scenario known as Combination (Kellys) Syndrome, all of the following are true EXCEPT: N

This scenario is most commonly associated with a fully edentulous mandibular arch

opposed by a partially edentulous maxillary arch (Kennedy Class I).

It is helpful to maintain maxillary anterior teeth (even as overdenture abutments) to

prevent this clinical scenario from occurring.

This syndrome results mainly from an imbalance in loading and support between the

dentate and edentulous portions of the opposing arches.

This syndrome is a common clinical scenario when the patient is fully edentulous in

both arches.

a and c

a and d

b and d

*10The retromylohyoid distal extension of the lower denture is limited by all of the

following except:

Y

Mylohyoid muscle

Ramus

Buccinator.

Pterygo mandibular raphe.

Superior constrictor.

43Overdenture abutments are favorable for all of the following reasons, EXCEPT:

Y



They provide the psychological advantage of natural feeling for the patient They always provide additional retention for the overdenture

They provide improved support for the overdenture


40Which of the following is TRUE regarding natural overdenture abutment without

attachments?

i. Overdenture abutments should passively contact the denture during rest j. Overdenture abutments should contact the denture only during function k. The height of the abutment should be at the level of the gingiva l. The root canal should always be endodontically treated

N

A+B

B+C

A+C

A+B+C

All of the above

1The rate of residual ridge resorption is generally greater in the mandibular residual

ridge than the maxillary. How much greater?

Y

2 times greater

3 times greater

4 times greater

5 times greater

The statement is incorrect. The rate of bone resorption in the mandibular residual

ridge is the same as the rate of bone resorption in the maxillary residual ridge

2Which of the following clinical situations usually has the poorest prognosis?

N





a and b

b an c

3Hanau described five factors that affect occlusion in complete dentures. If a patient

is to wear a single complete denture opposing a fully dentate arch and we desire a

balanced occlusal scheme, which of the following factors is it most practical to adjust in

the complete denture:

Y

Condylar guidance

Occlusal plane

Cusp height/ angle

Incisal guidance

Compensating curves

5When considering the material to use for the artificial teeth in a single complete

denture opposing natural dentition, all of the following statements are true EXCEPT:

N

Acrylic resin artificial teeth bond chemically to the polymethyl-methacrylate

(PMMA) denture base and are easy to adjust and reshape.

Although porcelain artificial teeth are difficult to adjust, they have the advantage of

causing less wear (abrasion) to opposing natural teeth than acrylic.

Although cast metal occlusal surfaces can be custom designed to match to opposing

natural teeth, the technique is often expensive and time-consuming.


a and c

b and d

6If a patient has Combination syndrome it is probable that we will see all of the following EXCEPT:

Y

Anterior rotation of the mandible during occlusion (Class III / prognathic

relationship)







7According to Monsons Spherical Theory of Occlusion, a number of occlusal landmarks lie on the surface of a 10 cm radius sphere with its center in the region of the

glabella. These landmarks include all of the following EXCEPT:

Y




Points approximately between the bottom two-thirds and top one-third of the

mandibular retromolar pads


8According to Attwood classification of ridges, Class IV is:

Y



Knife edge ridge



9The most favorable ridge contour for complete denture is:

Y


V shaped.

Knife edge.

Flat ridge.

Ridge with multiple specules.

11When making the final impression of the lower edentulous arch, the patient is

asked to exert a closing force while the dentist exerts a downward pressure. This is to

activate:

Y

The masseter





12Once a stable and retentive peripheral seal is achieved and appropriate spacing is

incorporated, your choice of the final impression material for complete denture would be:

Y

addition silicone

polyether.

zinc oxide eugenol.

alginate.


13. Your impression technique of choice for ridges that equate to Atwood class V

and VI is:

Y

Admix



14The final impression is taken with green stick tracing compound. Using the heated spoon-end of a Le Cron carver, the green stick related to the crestal ridge is

removed and the related area of the tray is perforated. Light-body Poly Vinyl Siloxane is

injected into the buccal and lingual shelves of the green stick and the tray is gently

inserted in the mouth . This is a description of the impression technique used for : Y

.The fibrous (un-employed) posterior mandibular ridge.

Flabby ridge


Immediate dentures.


15With regard to the Neutral Zone technique, when do you record the Vertical

Dimension (VD)?

Y





16Which of the following is LEAST likely to cause a traumatic denture ulcer:

Y

ill-fitting denture





17Which of the following is LEAST likely to cause inflammatory papillary

hyperplasia:

Y






18Which of the following is LEAST likely to cause epulis fissuratum:

Y


continual ridge resorption that allows the denture flanges of existing dentures to dig into the buccal/labial vestibule inadequate border molding

lack of peripher seal in the maxillary denture

19Which of the following statements is inaccurate:

Y

Type I denture stomatitis (candidosis) presents as a localized simple inflammation or

pinpoint hyperemia

Type II denture stomatitis (candidosis) presents as diffuse erythema involving part

of all of the dentrure covered mucosa

Diagnosis of denture stomatitis (candidosis) can be confirmed by direct smear from

the denture and identification of Candida albicans spores

Denture stomatitis (candidosis) often occurs in patients with predisposing factors

such as xerostomia

20Which of the following statement regarding angular chielitis is FALSE:

Y



frequently associated with both Candidal and secondary bacterial (Staphylococcal)

infection


infection starts under complete denture prosthesis and spreads via saliva to the skin

folds at the angles of the mouth

21All of the following are part of the routine management of denture stomatitis

(candidosis), EXCEPT:

Y

correct ill-fitting dentures or fabricate new ones

improve oral and denture hygiene

antifungal therapy

complete surgical excision of infected mucosa

22Diagnosis of the underlying cause of burning mouth syndrome is difficult and

frustrating for the doctor because there are too many clinical signs.

N

TRUE

FALSE

23Burning mouth syndrome is most common in middle-aged females

N

TRUE

FALSE

24V-shaped palatal vault is often associated with Class III posterior palatal form leading to improved in peripheral seal in maxillary complete dentures.

N

TRUE

FALSE

25According to Houses classification of mental attitude, a Skeptical patient is a patient who seeks treatment because a friend or relative has encouraged them to do so.

N

TRUE

FALSE

26It is often more difficult to set complete denture teeth for patients who have had

recent extractions than patients who have been edentulous for several years

N

TRUE

FALSE

27It is important not to look at a patients previous ill-fitting dentures, because such dentures will cause us to repeat the same errors in the new dentures.

N

TRUE

FALSE

28Impressions for rebasing of existing complete dentures are made without using a

closed mouth impression technique. In the final rebased dentures, which of the following error is most likely to occur:

Y


premature occlusal contact on the right side of the mouth if the operator is left-

handed

premature occlusal contact on the right side of the mouth if the operator is right-

handed



29Tissue conditioner can be used both (1) as a functional impression material and (2) to allow the soft tissue to heal before permanent relining and rebasing procedures are

performed.

N

TRUE

FALSE

30 Which of the following statements is FALSE regarding relining and rebasing:

Y


A common problem during relining is correct orientation of the dentures during the

impression/ relining procedure



31Maxillary complete dentures require relining only slightly more often than

mandibular complete dentures.

N

TRUE

FALSE

32Which of the following statements is FALSE regarding relining and rebasing:

Y

Rebasing is a procedure which involves resurfacing the tissue side of a denture with

new base material to make it fit more accurately


Relining is not a useful procedure when a change in vertical dimension of occlusion

is necessary



33An edentulous patient has residual ridge undercuts. If alveoplasty surgery is

performed, it is advisable to remove only half of the alveolar bone creating the undercut.

N

TRUE

FALSE

34Which of the following statements is TRUE regarding preprosthetic surgery in

edentulous patients:

i. Autogenous hydroxyapatite can be used to augment and rebuild a resorbed ridge but may result in migration of the particles

j. Autogenous iliac crest block graft is effective in rebuilding resorbed ridges but may limit interocclusal space

k. Autogenous inferior border rib grafts may be used to augment resorbed mandibles, but may interfere with an ideal occlusal plane

l. Autogenous bone may resorb as much as 80 per cent within the first ten years after grafting

Y

A + B + C + D

B + D

A + B + C

A + B + D

A + D

35In Mucosal Advancement Vestibuloplasty, the mucosa of the vestibule is used to line one side of the extended vestibule, and the other side heals by growth of a new

epithelial surface.

N

TRUE

FALSE

36Which of the following statements is TRUE:

i. Palatal tori should always be removed surgically because they interfere with denture retention

j. Hyperplastic tuberosities are easy to remove surgically because they consist of healthy alveolar bone

k. All other treatment options should be tried before surgically removing inflammatory papillary hyperplasia

l. Surgical removal of palatal tori may result in hematoma formation if a surgical stent is not used

Y

A + B

C + D

B + C + D

A + C

B + D

37A patient has a single maxillary denture opposing natural lower anterior teeth and

a Kennedy Class I RPD. The patient has flabby resilient tissue in the anterior maxilla.

Which of the following treatment options would provide the best future prognosis.






38Which of the following is NOT an indication for pre-prosthetic surgery

Y






39Which of the following statements is TRUE:

Y

Excessive space under overdentures over the gingival margins of abutment teeth

may lead to the development of dead space which may lead to gingival inflammation and hypertrophy

Reducing the tooth height creates an unfavorable crown:root ratio for overdenture

abutments

Fortunatley, the exposed dentine of overdenture abutments is naturally resistant to

caries

Gold copings that cover overdenture abutments are the most effective means to

prevent caries in these abutments

41Which of the following are possible problems associated with overdentures?

i. Reduced inter-arch space for the setting of teeth j. Increased labial fullness of the abutments k. Weakening and fracture of the denture base over the abutment l. Recurrent caries of natural overdenture abutments

N

A+B

A+B+D

All of the above

42Regarding overdentures, which of the following is TRUE:

N




A + B

B + C

A + C

A + B + C

44In which of the following situations is it ethically acceptable to cheat on a

Prosthodontics examination?

N

If the instructor is busy answering another student's question or talking on his

mobile phone

If your grades are low and you are afraid of failing

If you can see your neighbor's computer screen clearly

If you didnt study because you thought the exam would be postponed due to snow If the pretty/handsome student next to you smiles at you and asks for help

If you are at the top of your class and you are afraid of dropping to second

If you are second in your class and you want to become first

If you didn't feel like studying last night and watched television instead

None of the above

1. Complete denture impression technique selective pressure technique. When using a selective pressure technique for complete denture impressions, what areas of the edentulous mouth require more pressure? a) Residual ridges b) Buccal shelf c) Border seal (posterior palatal seal area) d) a, b, c e) b and c only 2. Combination syndrome, Kellys syndrome which consists of all of the following except:

a) Loss of bone from the anterior part of the maxillary ridge b) Downgrowth of the maxillary tuberosities c) Candidiasis infection of the tissues of the hard palate d) Extrusion of the lower anterior teeth e) Loss of bone beneath the removable partial denture bases

3. Occlusal schemes for complete dentures. Which of the following statements concerning lingualized occlusion for complete dentures is correct? 1. Results in placement of the mandibular teeth lingual to the ridge crests. 2. Uses anatomical teeth for the maxillary denture and modified or semi anatomical teeth for the mandibular denture. 3. Concentrates forces of occlusion on lingual cusps of the upper posterior teeth and vertical forces centralized on mandibular teeth. 4. Contraindicated for patients with flat ridges, which are unable to resist lateral forces. (Although it can be used to reduce lat. forces)

a. 1, 2, 3 b. 2, 3, 4 (4 is not totally ok!!) c. 1, 3, 4 d. All of the above

4. While observing lateral excursions in your denture patient, the maxillary denture dislodges, but adequate flanges and borders are present. You would

a. check and adjust the labial frenum area b. check and adjust the buccal frenum area c. restart the case and have the teeth reset more lingually d. increase the thickness of the post-dam area e. check the distobuccal flanges for coronoid process impingement

5. After processing full upper and lower dentures with cusped teeth, selective grinding must be done to correct occlusal errors from fabrication procedures. What is the correct sequence of grinding?

a. protrusive, centric, balancing, working b. centric, protrusive, balancing, working c. centric, working, balancing, protrusive d. centric, balancing, working, protrusive e. centric, working, protrusive, balancing

6. Which of the following muscles aid in the retention and stabilization of complete dentures?

1. masseters 2. buccinators 3. mylohyoids 4. medial pterygoids 5. orbicularis oris

a. 1,2,4 b. 2,3,4 c. 1,3,5 d. 2,5 e. 2,3,5

7. Which of the following is the MOST important factor when making a

record of centric relation for complete dentures?

a. the patient should be in a reclined position b. accurate and stable recording bases should be used c. central bearing plates and a tracing device should be used d. the patient should be allowed to close in his accustomed position when a

wax registration is used e. the patient should not be allowed to wear their dentures for 24 hours

prior to recording centric relation

8. Gagging at denture insertion may be caused by 1. overextension of the posterior border of the maxillary denture. 2. overextension of the distal lingual flange of the mandibular denture. 3. an excessively thick posterior border of the maxillary denture. 4. a decreased vertical dimension in the final denture.

a. 1,2 b. 1,2,3 c. 2,3,4 d. 3,4 e. all of the above

9. When constructing complete dentures, which of the following factors is determined solely by the patients anatomical characteristic?

1. incisal guidance 2. centric relation 3. the compensating curve 4. orientation of the occlusal plane 5. condylar guidance

a. 1,3,5 b. 1,2,5 c. 2,4,5 d. 2,5 e. 2,3,5

10. The most reliable landmark for determining the posterior height of the occlusal plane is a point

a. 4mm below the parotid duct b. 2mm above the resting height of the tongue c. midway between the tuberosity of the maxilla and the retromolar pad d. at the middle of the retromolar pad (2/3 of retromolar pad) e. 3mm above the crest of the ridge

11. The infraorbital pointer is used for transferring: a. midline shift b. hinge-axis relation c. occlusal plane position (in relation to hinge of axis) d. radius of condyle reference point

e. horizontal condylar inclination

12. When viewed from the sagittal plane, what angle is formed between the protrusive and balancing condylar paths?

a. Christensens b. Bonwills c. Fischers d. Bennetts e. Wilsons

Regarding the denture base in tooth-borne partial dentures:

Y

The length of the saddle area could affect the type of it

Short span bases are usually metal especially in the anterior region

Limited inter-arch space usually indicate mesh form bases

Anticipated loss of teeth could affect the type of metal used for it

Generally, metal bases are contra-indicated

Which of the following alloys could be used in metal-base RPD:

Y

Co-Cr alloys with 60% chromium


Yellow gold alloys (ADA type III)

Low gold alloys with less than 85% gold and platinum

None of other choices

Base metal alloys are better than gold alloys in the following/s:

Y

Density

Elongation

Tensile strength

Yield strength

Hardness

If you need to add a clasp/s made from wrought alloys to metal-based RPD:

Y

You should add it to the acrylic part of the denture

They are usually made from Co-Cr alloys

It is usually soldered to the closest part of the metal base

They are made with a gauge from 18-22


Regarding special trays for metal-base RPDs:

Y

All special trays are spaced with a proper wax to give room for the impression materials

They should have handles

They should be perforated for alginate impression materials

They are made from acrylic resin

All of other choices

Regarding altered cast impressions:

Y

They are essential in every class I or II Kennedy classification

They are made after metal try-in with a full arch special tray

They are usually made with alginate impression material

They require full border moulding for the available tray


Regarding altered cast technique:

Y

The impression should be made with finger pressure on the saddle areas

You need to stabilise the framework with an anterior third point of reference for seating the tray

You need to cut the original cast at the external finish line border

You need a partial tray with 1 mm wax spacer


When you compare Applegate technique to relining RPDs:

Y

Applegate technique is less demanding

Relining is better to keep the original jaw registration

Relining is less accurate than Applegate technique

Both will produce an occlusal discrepancy


Regarding metal base RPDs try-in stage:

Y

Mandibular major connector must be polished on the fitting surface

It must have complete and stable seating on the master cast

Relief areas must be visible where indicated

The occlusal interferences is usually coming from an occlusal rest at the marginal ridge


Your patient has no lower posterior teeth. You have tried in the framework and are border molding the extension areas in preparation for an altered cast impression. The distolingual border molding is shaped by the?

Masseter muscle

Internal pterygoid muscle

Superior constrictor muscle

Mylohyoid muscle

The external finish line is

The external junction of framework metal and denture base plastic.

The external junction of framework metal and supporting tissues.

The external junction of the framework metal and the natural teeth.

The external junction of the natural teeth and the denture base plastic

1. The aesthetics of complete denture started in the stage of: a. Selection of teeth b. Setting of teeth c. Finished denture d. Final/Secondary Impression stage e. A and B

2. Artificial teeth are best selected from: a. Shape of the face b. Shape of the arch c. Age of the patient d. Pre-extraction records e. All of the above

3. The most important factor in the arrangement of teeth is: a. Aesthetics b. Leverage c. Occlusion d. Occlusal plane e. None of the above

4. Overbite is : a. The maximum horizontal overlap between the upper and lower anterior teeth b. 0.5-1.0 mm in the dentate patients c. Determined by the incisal/anterior guidance d. Helpful in denture stability e. Affecting the cusp angles

5. Regarding the distal extension of your upper complete denture: a. Ah/vibrating line is the functional border b. Can be determined at any stage following the primary impression

c. It ends in a the hard palate movable structures d. The distal area is the Postpalatal seal area only e. Essential for denture retention

6. Regarding the cusp angle for posterior acrylic teeth: a. The steeper the angle, the steeper the compensating curves b. It is formed by the cusp slopes of the functional cusp and the occlusal plane c. Indicated always to be efficient in chewing d. Essentially requires semi-adjustable articulators and face-bow record e. None of the above

7. Regarding teeth position in a complete denture: a. The lower anterior teeth are just on the crest of the ridge b. The upper posterior teeth are occluding over a line passing by the buccal shelf and

the Retromolar pad

c. The upper anterior teeth position is determined by the smile line, canine lines and visibility

d. The lower posterior teeth are centred over the crest of the upper posterior alveolar ridge

e. The lower posterior teeth are just inferior to the level of the lateral side of the tongue

8. Regarding compensating curves in a complete denture: a. They are not a factor in aesthetics b. Curve of monson is convex upward in the lower second molar area c. The lateral curves are important to keep teeth contacts in the orbital condyle

side

d. They can be produced in a monoplane articulator e. They are efficient in reducing the Bennett movement of the working condyle

9. Regarding the shape of the curve of the labial surfaces of the six anterior teeth when viewed occlusally in complete dentures:

a. Affected by the shape of the underlying alveolar ridge b. Not affected by the width of the sulcus c. Affected by the shape of the occlusal rim as carved in the registration stage d. Narrower in the V-shaped arches e. A+C+D

10. Regarding setting teeth for complete denture using plane-line articulator: a. It results in a balanced occlusion b. Usually indicated in the well formed ridges c. It results in cuspal interference which causes instability d. It reduces the trauma in atrophic ridges

e. C+D

11. In a balanced occlusion: a. You need at least an average-value articulator b. During protrusion, there must be a vertical drop less than the overbite c. Christensens phenomenon is essential in producing balanced occlusion d. The Condylar guidance is an important factor in a balanced occlusion which can

be controlled by the dentist to a certain extent

e. The compensating curves and cuspal angles could be used alternatively or synergistically in a balanced occlusion

12. Regarding phonetics in complete denture patients: a. Phonetics is important in registering the retruded contact position b. The closest speech space is considerably affected by the free-way space c. S and Z sounds are essential to check the labio-dental relation d. M,P and B sounds are affected by the occlusal vertical dimension e. B+D

13. Regarding the height of the occlusal plane: a. It is not important for upper denture stability b. The higher the occlusal plane, the longer the lower anterior teeth c. The higher the occlusal plane, the greater the distal directing lower forces d. This plane is affecting the occlusal vertical dimension e. All of the above

14. During the trial stage, you need to check the aesthetics: a. The incisal third of the lower teeth will show in smiling patient b. The vermilion border should be obvious only in the young patients c. There should be no oro-facial wrinkles when the dentures inserted d. The midline should coincide with the smile midline e. The visibility must be 2-3 mm

15. Regarding the Postpalatal seal area: a. It is bounded anteriorly by the maxillary tuborosity b. It is determined by the vibrating line posteriorly c. It is usually posterior to the fovea palatini d. It crosses the midpalatal raphe and the middle of the hamular notches e. B+C

16. Regarding this diagram: a. This is the classification of the vibrating lines b. In class A, you need a narrow postdam c. This movement result from saying (H) d. Essential to check in the secondary impression stage e. B+D

17. For denture cleaning, all are correct except: a. 10% Sodium hypochlorite is the material of choice for disinfection b. Hot water could cause warpage c. Water filled hand basin is indicated during cleaning d. It should be cleaned after each meal e. None of the above

18. Regarding the retromolar pad and occlusion of a complete denture:

a. It is important in determining teeth position b. The occlusal plane is just above the level of it c. The lower denture edge should cover 1/2-2/3 of it d. A+C e. None of the above

19. Regarding functional cusps in acrylic teeth: a. They are the palatal/lingual cusps b. They are the buccal cusps c. They are making centric stops in protrusion d. They are the palatal cusps only when you use lingualised occlusion teeth e. None of the above

20. Regarding the anatomical landmarks in setting teeth in a complete denture: a. A line bisecting the incisive papilla is bisecting the canines as well b. A line passes by the incisive papilla distally is 10 mm from the incisal edge c. A line bisecting the retromolar pad should pass over the lower crest d. The buccal cusps of the upper posterior teeth should be centred over the crest of

the lower ridge

e. None of the above

21. The width of the anterior teeth was 52 mm, then the distance from the midline to the canine line is:

a. 20mm-21mm b. 21mm-22mm c. 25mm-26mm d. 24mm-25mm e. None of the above

22. Regarding the selection of the shape of anterior teeth for complete denture: a. It usually follows the shape of the lower arch b. It usually follows the shape of the upper alveolar ridge according to Williams

classification

c. It usually follows the shape of the head as you look from the front d. It usually follows the reversed shape of the face

Q.16

e. It is mainly for the lateral and central incisors

23. In choosing a posterior acrylic tooth for your patients, you do not consider: a. The form of the ridge b. The type of the articulator c. The type of the occlusion d. The type of the material from which the tooth is made e. None of the above

24. The length of your anterior acrylic tooth could not be affected by: a. Mobility of the upper lip b. The visibility on smiling c. The visibility at rest d. The height of an occlusion e. None of the above

25. Regarding the shade selection of your acrylic teeth: a. It is a team work b. The maxillary centrals are the lightest teeth c. Teeth darken as you go posteriorly d. Teeth darken with age e. All of the above

26. The following materials could be used for your anterior teeth except: a. Porcelain b. Metal Onlay c. Resin composite d. Acrylic e. All of the above

27. Regarding the semi-adjustable articulators: a. All of them are ARCON type articulator b. They are essential to produce maximum intercuspation c. They are class II articulators d. They accept face-bow records e. They can receive pantograph records

28. The occlusal requirements for complete denture patients are: a. Maximum incisal guidance b. Maximum intercuspation c. Availability of cusp width d. Absence of deflective contacts e. 10 degree Condylar guidance

29. Regarding Hanua Quint: a. The condylar guidance is adjustable

b. The incisal guidance is determined by checking the speech c. The cusp height is mostly judged by the clinician d. The occlusal plane is always predetermined e. The compensating curves are optional

30. Regarding mounting the upper cast on an articulator: a. You need always a face-bow b. You need always a remounting jig c. The occlusal plane is usually between the horizontal and 100 degree with the

horizon

d. Mounting usually performed with a dental stone e. The incisal pin should be out of touch with the incisal table

The function of the proximal plate is to:

N

Help establish a definitive path of insertion/dislodgement.

Stabilize the RPD by controlling its horizontal position.

Provide contact with the adjacent tooth.

A and C

All of the above

A wrought wire clasp is NOT used in which of the following situations:

N

As an embrasure clasp

On a terminal abutment of an extension RPD.

On a tooth with an indirect retainer on it.

Both 1 and 2 above.

All of the above

Reciprocation between bracing and retentive components requires:

N

I-bars be used

Bracing components contact after retentive components

Correct timing of contact during seating and removal of the RPD

Both a and c

All of the above

Infrabulge clasps originate:

Y

Above the height of contour

Below the height of contour

Above the 0.01" undercut

Above the occlusal surfaces of most premolars


A clasp assembly should:

N

Have a retentive arm with adequate length and taper for flexibility

Have a retentive arm that terminates in an undercut

Have elements that considered together, provide 180 degree encirclement

A and B


The presence of mandibular lingual tori would indicate the need for:

Y

Metal base

Lingual plating

Tube teeth

Extra indirect retainers


In the design process for tooth-borne partial dentures:

N

c. Modified palatal plate is usually indicated

c. Adequate tissue relief is required for lower major connectors

c+. The anticipated loss of teeth could affect the choice of your major connector

c. 2-3mm from the lingual gingival is the minimal requirement for lower major connectors

c. B+C+D

When you select the clasps for tooth-borne RPDs, you need to consider the following except:

Y

The expected required support for your RPD

The coverage of both dental and gingival tissues

The periodontal status of the abutment teeth

The patient preference

The presence of previous RPDs

The following clasps are commonly used for tooth-borne RPD except:

Y

Cast combination clasps which provide bilateral bracing

Cast reciprocal arm and wrought retentive arm

T-clasps are common for aesthetic reasons

Hair pin clasps

. All of other choices

Regarding the denture base in tooth-borne partial dentures:

Y

The length of the saddle area could affect the type of it

Short span bases are usually metal especially in the anterior region

Limited inter-arch space usually indicate mesh form bases

Anticipated loss of teeth could affect the type of metal used for it

Generally, metal bases are contra-indicated

For designing RPD in distal extension bases:

Y

You need to evaluate the dento-alveoalar support potential only

The potential load from different forces is usually destructive

You need to assess the history of previous RPD

Acrylic partial dentures are good alternatives


The movement of extension base away from the ridge could be counteracted by:

Y

Direct retainers

Indirect retainers

Minor connectors

Gravity


The Mediolateral movements in distal extension bases are counteracted by:

Y

Denture bases

Mandibular major connectors

Roach clasps

Clasp retentive components

The artificial teeth

The most important factor/s in determining the success of bilateral free-end saddles lower RPD is:

Y

Maximum tissue coverage

RPI system

Using wrought alloys for the clasps

Altered cast technique


The block out used for maintaining a space for the acrylic resin in Co-Cr RPD is:

Y

Paralleled block-out

Shaped block-out

Arbitrary block-out

Relief block-out


Which of the following alloys could be used in metal-base RPD:

Y



Yellow gold alloys (ADA type III)

Low gold alloys with less than 85% gold and platinum


Base metal alloys are better than gold alloys in the following/s:

Y

Density

Elongation

Tensile strength

Yield strength

Hardness

If you need to add a clasp/s made from wrought alloys to metal-based RPD:

Y

You should add it to the acrylic part of the denture

They are usually made from Co-Cr alloys

It is usually soldered to the closest part of the metal base

They are made with a gauge from 18-22


Regarding preparing guiding planes:

Y

They are always prepared on the proximal surfaces

They are 4-5 mm cervico-occlusally

They are larger on the abutment teeth in distal extension RPD

They should be prepared after preparing the rests seats when applicable


The survey line of abutment teeth could be adjusted to:

Y

Permit the retentive arm tip to be placed in the middle third

Reduce the amount of relief for the minor connectors

Usually prepared with a bur angled to the log axis of the opposing tooth

It should be prepared before the primary impression stage


Regarding the preparation of rest seats for metal-based RPD:

Y

It should be always prepared whenever a rest is going to be placed

It should be prepared toward the pulp

It should be prepared with an inverted cone bur

It needs at least 2 mm depth whenever possible


For occlusal rest seats:

Y

It should be inclined toward the marginal ridge

It should be a rounded triangle with the base centrally when viewed occlusally

The width should be about 1/3 of the mesio-distal width of the abutment

The angle at the marginal ridges should be obtuse


For cingulum rest seats:

Y

It is usually prepared on the lower canines

It is usually 1.5 mm depth

It is prepared with a round diamond bur

It could be a part of lingual plating


What is the incorrect statement regarding an occlusal rest seat?

Y

It should be properly shaped with round angles

It should direct forces along the long axis of the tooth

It should be prepared before the guide planes

Its bucco-lingual width is one half the bucco-lingual dimension of the tooth


What is the least desirable rest of the followings?

Y

Incisal rest

Occlusal rest

Cingulum rest

Embrasure rest

Ball rests

All of the followings are functions of rests except:

Y

Transfer occlusal forces to the abutment teeth

They could perform function of direct retainers

Maintain the clasps in their position

Prevent the impaction of food between the abutment and the clasp


What is the incorrect statement regarding incisal rests?

Y

It is usually used on mandibular canines

It is the least desirable rest

Its seat form is usually V shape notch with 1.5 mm depth

It is always preferred over the lingual rests


When you plan a crown for a mandibular canine what type of rest would you prepare on this tooth?

Y

Occlusal rest

Lingual rest

Incisal rests

Right angle rest


29. The angle between the rest and the minor connector must be less than 90 degree because if it is not, the rest will allow the prosthesis to move away from the abutment tooth with the rapid failure of the prosthesis.

Y

The statement is correct but the cause is incorrect

The statement is incorrect but the cause is correct

The statement and the cause are correct

The statement and the cause are incorrect

None of the other choices

Which one of the following rests does not have a reciprocal arm?

Y

Spoon shape rest

Ledge shape rest

Inverted v-shaped rest

Half moon shape rest

None of the other choices

The best restoration to support an occlusal rest is:

Y

Silver amalgam

Resin composite

Porcelain of the full crown restoration

Metal of the full crown restoration


Regarding tripodizing a cast:

Y

It is essential for distal extension bases only

Requires cast being placed on zero tilt

It is not essential for bounded saddles

It is helpful for master cast surveying

none of other choices

Regarding zero-degree surveying:

N

It is essential in every case of partially dentate arch needs RPD treatment

The base of the cast should be parallel with the floor

It is highly indicated to be the only surveying for design


A+C

After surveying the study model, you need:

Y

To block out the proximal undercut areas

To assess the possible tooth preparation after secondary impression

To send the study model for duplication

To send the study model back to the clinic along with a proper design


Choose the correct serial for making metal-base RPD:

Y

Primary impression, Surveying and design, 2nd

impression, mouth preparation, Metal try-in

Primary impression, surveying and tripodizing, Design, Jaw registration, 2nd

impression, metal try-in

Primary impression, surveying and design, mouth preparation, 2nd


Primary impression, surveying and design, jaw registration, Moth preparation, 2nd



Regarding acrylic RPDs:

Y

They are lighter than metal RPD

They are less bulky than metal RPD

They require rest seat preparation

They are gum strippers

They are tooth and mucosa borne partial dentures

For making an acrylic RPD:

Y

You need to get 2nd

impression always

Jaw registration is essential

Shade selection is usually in the first visit

You need to block out the facial undercut areas


Regarding acrylic RPDs:

Y

The minimal thickness is 1.5-2 mm at any point

The flanges should follow the anatomical land marks when applicable

You need a retentive clasp on each abutment tooth

It is commonly used as a temporary aesthetic solution


Regarding classification of partially dentate arches:

Y

Kennedy classification is dependent on load distribution

Craddock one is dependent on saddle distribution

You need direct retainers only in class I, II, and IV Kennedy classification

Applegate one is a helpful classification system


Choose the correct serial of the following laboratory steps for metal-base RPDs:

Y

Master cast block-out, duplication, wax pattern build-up, casting, spruing, finishing and polishing

Duplication, wax pattern build-up, spruing, investing ring, casting, finishing and polishing

Duplication, wax pattern build-up, casting, investing ring, framework recovery, finishing and polishing

Master cast duplication, spruing, wax pattern build-up, investing ring, casting, finishing and polishing


For treatment plan formulation, choose the correct serial:

Y

Preparatory phase, corrective phase, treatment phase, maintenance

Preparatory phase, treatment phase, corrective phase, after care

Preparatory phase, prophylaxis phase, restorative phase, after care

Preparatory phase, treatment phase, laboratory phase, after care


Regarding special trays for metal-base RPDs:

Y

All special trays are spaced with a proper wax to give room for the impression materials

They should have handles

They should be perforated for alginate impression materials

They are made from acrylic resin


Regarding elastomeric impression materials for metal-base RPDs:

Y

They are rigid, making retrieval of the cast difficult

They are more accurate than alginate impression materials

They are of high dimensional stability

They require relatively long setting time


Regarding altered cast impressions:

Y

They are essential in every class I or II Kennedy classification

They are made after metal try-in with a full arch special tray

They are usually made with alginate impression material

They require full border moulding for the available tray


Regarding altered cast technique:

Y

The impression should be made with finger pressure on the saddle areas

You need to stabilise the framework with an anterior third point of reference for seating the tray

You need to cut the original cast at the external finish line border

You need a partial tray with 1 mm wax spacer


When you compare Applegate technique to relining RPDs:

Y

Applegate technique is less demanding

Relining is better to keep the original jaw registration

Relining is less accurate than Applegate technique

Both will produce an occlusal discrepancy


Regarding metal base RPDs try-in stage:

Y

Mandibular major connector must be polished on the fitting surface

It must have complete and stable seating on the master cast

Relief areas must be visible where indicated

The occlusal interferences is usually coming from an occlusal rest at the marginal ridge


Regarding the cast stops in Co-Cr RPDs:

Y

They are essential for bounded saddles

They are placed in the middle of distal extension base

They are required to keep a space for the impression materials

They are helpful to make intimate fit of the metal base


Comparing open construction (lattice) to mesh construction:

Y

Acrylic resin is better retained by the mesh form

It is usually recommended to use the lattice form

The mesh form is more rigid than the lattice one

It is easier to set teeth over the lattice form


Regarding theories of design:

Y

Stress equalization is employing stress directors

Stress equalization is better in bone resorption wise

Physiologic basing requires minimal retention

Broad stress distribution is complicating the oral hygiene


For designing class II Kennedy cases (no modification):

Y

Generally, you need at least 4 clasp assemblies

2 indirect retainers are required

You need a maximum coverage major connector in the maxilla

Lingual plating is contra-indicated


For designing class IV Kennedy cases:

Y

You need 4 clasps assemblies

Broad palatal co

Date post:	25-Nov-2015
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