Classification of Malocclusion

Classification of Malocclusion

Mohamed G. Hassan, Ph.D., M.Sc., B.D.S. Lecturer, Department of Orthodontics,

South Valley University, Qena, Egypt.

OCCLUSION1.Balanced Occlusion.

2.Functional Occlusion.

3.Traumatic Occlusion.

4.Trauma from Occlusion.

5.Ideal Occlusion.

OCCLUSION•Balanced Occlusion:

An occlusion in which balanced and equal contacts are maintained throughout the entire arch during all excursions of the mandible.

OCCLUSION•Functional Occlusion:

An arrangement of teeth which will provide the highest efficiency during all the excursive movements of the mandible which are necessary during function.

OCCLUSION•Traumatic Occlusion:

It’s an abnormal occlusal stress which is capable of producing an injury to the periodontist.

OCCLUSION•Trauma from Occlusion:

It’s the periodontal tissue injury caused by the occlusal forces due to abnormal occlusal contacts.

OCCLUSION•IDEAL Occlusion:

It’s a pre-conceived theoretical concept of occlusal structural and functional relationships that include idealized principles & characteristics that an occlusion should have.

CENTRIC RELATION

CENTRIC OCCLUSION

DISCLUSION

ECCENTRIC OCCLUSION

CLASSIFICATION

CENTRIC RELATION

It’s the relation of the mandible to the maxilla when the mandibular condyles are in the most superior and retruded position in their glenoid fossa

CENTRIC RELATION

CENTRIC OCCLUSION

DISCLUSION

ECCENTRIC OCCLUSION

CLASSIFICATION

CENTRIC OCCLUSION

It’s the position of the mandibular condyle when

the teeth are in the maximum intercuspation.

(Intercuspal Position)

CENTRIC RELATION

CENTRIC OCCLUSION

CENTRIC RELATION

CENTRIC OCCLUSION

DISCLUSION

ECCENTRIC OCCLUSION

CLASSIFICATION

ECCENTRIC OCCLUSION

FUNCTIONAL OCCLUSION

NON-FUNCTIONAL OCCLUSION

Remember

CLASSIFICATION

CLASSIFICATIONMeans??

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Objective

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Types!!!!

DEFINITION

• Is a process of analyzing cases of malocclusion for the purpose of aggregating them into a small number of groups and these groups are characterized by certain specific variations from normal occlusion

OBJECTIVES

• To identify the problem.

• To recall past difficulties in Rx with similar cases.

• For communications.

• For ease of referral of cases.

• Facilitate management of cases

• Help in research work and activities

Deviation in intramaxillary and/or

intermaxillary relations of teeth

MALOCCLUSION

Definition

Remember

DEVIATION IN INTRAMAXILLARY AND/OR INTERMAXILLARY RELATIONS OF TEETH

MALOCCLUSION

• Malpositioning of Individual Teeth.

• Malreation of dental arches.

• Malrelation of the bony bases themselves.

MALPOSITIONING OF INDIVIDUAL TEETH


1. Labial (Facial) Inclination

2. Labial (Buccal) Displacement

3. Lingual Inclination

4. Lingual Displacement

5. Medial Inclination

6. Medial Displacement

7. Distal Inclination

8. Distal Displacement

9. Infra-occlusion

10.Supra-occlusion

11.Medio-lingual Rotation

12.Disto-lingual Rotation

13.Transposition

14.Imbrication


LISCHER’S TERMINOLOGY

Version

Labio/Bucco Linguo Mesio Disto Supra Infra Axi

Torsi Trans

INTRA-ARCH VARIATIONS

MARELATIONS OF DENTAL ARCHES THEMSELVES

Protrusion



Retrusion



Crowding



Imbrication



Spacing

INTER-ARCH VARIATIONS


Vertical Variation (overbite)

• It is the amount by which the lower incisors are concealed by the upper incisors when the teeth are closed in centric occlusion.

• Vertical Measurement.




• Deep overbite.

• Edge to edge.

• Open bite.




• Deep overbite.

• When there is a failure of the posterior teeth to reach their power eruptive height, the mandible will appear to be over-closure.

• Anterior teeth may appear over erupted and present deep over-bite




• Open Bite.• Anterior: the most distal teeth in the

arches occlude where a space exists between the rest of the teeth in the upper and lower jaw.

• Posterior: Exists when only posterior teeth on one or both sides are not occluding.


VARIATIONS

Vertical

OPEN BITE DEEP OVERBITE

OPEN BITE DEEP OVERBITE

Vertical



Transverse or Lateral Variation (overjet)

• it is the distance between the labial aspects of the lower incisors and the lingual aspects of the upper incisors when the arches are in centric occlusion.

• horizontal Measurement.



Transverse or Lateral Variation (overjet)• Excessive anterior overjet.

• Reduced anterior overjet.

• Anterior crossbite.

• Lingual crossbite.

• Scissors bite.

• Telescopic bite


VARIATIONS

Antroposterior

Excessive anterior overjet = Increased anterior overjet

Negative anterior overjet = Anterior Cross-bite


VARIATIONS

Transverse

Posterior Crossbite: • Buccal cusps of upper teeth occlude within fossae of the lower posterior teeth.

• Unilateral or bilateral. • Buccal or lingual • Maxillary or mandibular in origin.


VARIATIONS

Transverse

Scissors bite: Mandibular teeth are completely contained within the maxillary teeth when the teeth are in centric occlusion



Mesiodistal and/or Antroposterior Variation

• Distoclusion (Postnormal occlusion).

• Mesioclusion (Prenormal occlusion).

• Postural Prenormal occlusion (Pseudo)

POST-NORMAL OCCLUSION


• Condition when the lower dental arch appears to lie too far back in relation to the upper arch when the teeth are closed in centric occlusion

PRE-NORMAL OCCLUSION


• Condition when the lower dental arch is in advance of the the upper arch when the teeth are closed in centric occlusion


VARIATIONS

Antroposterior

Vertical

Transverse

TO BE CONTINUED

ACCORDING TO BODY TYPE

SIMON’S CLASSIFICATION

BRITISH STANDARD CLASSIFICATION

SKELETAL CLASSIFICATION

ANGLE’S CLASSIFICATION

THANK YOU

Date post:	10-Jan-2023
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Classification of Malocclusion

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