Date post: | 17-Aug-2015 |
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PONTIC DESIGNBy
DR. MUSTAFA I. ELGHOUL B.SC,B.D.S,MS(ORTHO)
University of PalestineCollege of Dentistry
BRIDGE
•A fixed dental prosthesis which cannot be removed by the patient
•ABTUMENT :
•The tooth which support the bridge or part of the bridge and to which the retainer is cemented.
ABTUMENTs
The ponticPontics are the artificial teeth in a fixed partial prosthesis, that replace the lost natural teeth ,and restore function and appearance. Its suspended between cast abutment restorations ,and attached
to retainer by a rigid connectors
pontic retainer
Rigid connector
Functions of the pontic
1-mastication –the pontic provides hard surfaces against which
food can be chewed by teeth in the opposing arch
2 -Speech (phonetics) A space created by the loss of tooth alters the pattern
of airflow making normal speech difficult .pontic helps to restrict air passage through edentulous area to aid in the reestablishment of normal sounds
3 -maintenance of tooth relationship
when missing teeth are not replaced, the teeth posterior to edentulous areas can move forward from their normal position , its also possible for teeth anterior to and opposing edentulous
spaces to drift distally and occlusally into open area . .
•Pontics maintain the integrity
• of dental arches by preventing teeth that are adjacent to and opposing an
edentulous area
• from moving out of their
• relationship.
4- esthetics (appearance)
Dental esthetics affects personal appearance , the presence of a full complement of teeth with a natural appearance is important to an individual's self
image. -Pontics , fill in the empty spaces that would be observed
during talking and smiling, provide support for lips and cheeks to allow normal facial form.
Pontic space
•well-aligned teeth and a pleasing smile afford apositive social status !
presence of a full complement of teeth with a natural appearance is important to an individual's self-image
The requirements of a pontic •
• 1 -Provide esthetics and comfort
•2 -Restore function
•3 -Biologically acceptable
•4 -Permit effective oral hygiene
•5 -Preserve underlying residual mucosa
RESIDUAL RIDGE CONTOUR
•The edentulous edge's contour should evaluated carefully. The ridge should be smooth, regular and free of frenum
attachment .
•Loss of residual contour may lead to unaesthetic appearance and lead to food
impaction .
Classification of residual ridges
•1-Class I defects faciolingual loss of tissue width with normal height.
•2-Class II defects loss of ridge height with normal ridge width .
•3 -Class III defects a combination of loss in both dimensions.
Pontic space
•Preventing tilting or drifting of the adjacent teeth into the edentulous space is important function of the fixed partial denture (FBD).
TERMINOLGY
•SPAN the part of the bridge which covers the edentulous area . Its connected or jointed to retainers at both ends in most of the bridges. but at one end in the case of cantilever bridges.
•PIER (Intermediate abutment)
•Any abutment other than terminal abutment of abridge.
Types of pontics
According to design According to material
All metal
All ceramic
All acrylic
Metal-combinationMetal-ceramic – metal-acrylic
With Mucosal contact
WithoutMucosal contact
2-Without mucosal contact
Sanitary (hygienic)
Recommended
Location advantages
disadvantages
Posterior
mandible Good
access for hygiene
Poor esthetics
Pontic designs
Recommended
Location advantages
disadvantages form
Sanitary
)hygienic (
Posterior
mandible
Good access for hygiene Poor esthetics
saddle or ridge-lap
Not recommendedEsthetics
Not amenable to oral hygyeine
Modified ridge-lap
Anterior teeth and premolars , some maxillary molars
Good esthetics
Moderately easy to clean
Conical
Egg or heart shaped
Molars without esthetics requirements
Good access for oral hygiene
Poor esthetics
Ovate
Maxillary incisor and premolars
Superior esthetics negligible food entrapment easy to clean
Requires surgical preparation
Pontic selection
•Pontic selection depends primarily on esthetic and oral hygiene.
•In the anterior region where esthetic is a concern the pontic should be well adapted to the tissue to make it appear that emerge from the gingiva
•In the posteriors teeth conversely
Connectors(JOINTS) For Fixed Partial Dentures
connectors are those parts of a fixed partial denture (FBD) that join retainers and pontics together
Types of Connectors
•RIGID CONNECTORS•rigid connectors in metal can be made by:
a- cast connectors: shaped in wax as apart of the process.
•b. Soldering connectors: use of intermediate metal alloy whose melting temperature is lower than that of the parents metal.
•.
•c . Welded connectors: melting adjacent surfaces with heat or pressure
•D- loop connectors
•Sometimes required when an existing diastema is to be maintained in a planned fixed prosthesis.
NON RIGID CONNECTORS
•Is indicated when it is not possible to prepare two abutment for an (FPD) with a common path of placement. So segmentally the design of large , complex (FBD); into shorter compartments is easier
to replace .
PRINCIPLES CONNECTORS DESIGN
•1-size•Connectors must be sufficiently large to prevent
distortion or fracture during function. but not too large to prevent interference with plaque, periodontal tissue disturbance over time.
•2-shape•The shape of the tissue surface of the connector
should be curved faciolingually and highly polished and smooth to facilitate cleaning and patient should be satisfied with the
appeareance .
3-postion
•The location of the contact area should be established correctly to influence the success and stability of the prosthesis.
•In the anterior teeth
•The connector should placed lingually
•In the posterior teeth
•Located in the occlusal third of the crown and more lingually