ANGLE'S CLASSIFICATION OF MALOCCLUSION

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1. ANGLE’S CLASSIFICATION OF MALOCCLUSION By – Nilesh Patil BDS - IV yr

2. Introduction Edward Angle introduced a system of classifying malocclusion in the year 1899. Angle’s system of classification is undoubtedly the most widely accepted and used becacuse of its simplicity in application.

3. Angle’s classification was based on - mesiodistal relation of the teeth, - dental arch - jaws

4. Angle’s assumption when formulation this classification was that the maxillary 1 st permanent molar is always in correct position and the variability comes from the mandible.

5. Thus, he fixed 1 st permanent molar as key point and based on lower 1 st molar deviation in relation to the upper 1 st permanent molar he classified the malocclution .

6. ANGLE’S CLASSIFICATION OF MALOCCLUSION Class i malocclusion Class ii malocclusion Class iii malocclusion

7. CLASS I MALOCCLUSION The normal relationship of the molar but line of occlusion is incorrect because of malpositioned teeth, rotations or other causes. The mesiobuccal cusp of the maxillry first permanent molar occludes with the mesiobuccal groove of the mandibular first molar,

8. CLASS II MALOCLUSION Lower molar distally position relative to upper molar, line of occlusion The mesiobuccal cusp of the lower first permanent molar occludes distal to the class i position.

9. CLASS III MALOCCLUSION lower molar mesially positioned relative to upper molar, line of occlusion not specified.

10. Limitations of angle’s classification The classification can not be applied to the deciduous dentition. Angle considered only anteroposterior relationship. In this also he had not mentioned about overjet and canine relation. He has not considered vertical plan relationship and transverse plan relationship.

11. In angle system upper 1 st permanent molar is a fixed point in the skull but this has not been found to be so. In case of missing 1 st molar, this classification can not be applied.

12. This system is not differentiating between skeletal and dental malocclusion. This system dose not enlighten about the etiology of the malocclusions.

13. Thank you