Modifications of angle`s classification

ORTHODONTICS- IMPORTANT TOPICS......MODIFICATIONS OF ANGLE'S CLASSIFICATION OF MALOCCLUSION

1. Modifications of angle`s classification Guided By - Dr Alka Benker , Dr R ahul Muchchadia , Dr M eghna R ao, Dr Y agnesh R ajpara , Dr V idhi P andya Presented By- Lipi Bhatt 3 rd year Batch-A Roll no-6 Department of orthodontics & dentofacial orthopedics

2. What is angle`s classification? Angle`s system of classification is based on the anteroposterior relationship of the teeth with each other. Angle introduced this classification with the concept of key of occlusion & line of occlusion. Maxillary first permanent molar is considered to be the key of occlusion & angle stated thet the position of the maxillary first permanent molar is relatively constant.

3. There are two modification of angle`s classification Lischer`s modification Deway`s modification

4. Lischer`s modification Lischer introduced the following names to angle`s classification. Neutrocclusion -class I Distocclusion -class II Mesiocclusion -class III

5. It consist of adding the suffix “ version “ to the word. these indicates the direction of deviation from normal position. Lischer also introduced nomenclature to describe malpositions of individual teeth.

6. Mesioversion -mesial to normal position. Distoversion -distal to normal position.

7. Linguoversion -lingual to normal position. Labioversion / buccoversion -buccal to normal position.

8. Infraversion -away from the line of occlusion. Supraversion -crossing the line of occlusion.

9. Axiversion -wrong axial inclination. Torsiversion -rotated on its long axis.

10. Transversion -transposition-wrong position of teeth.

11. Deway`s modification Martin D eway divided angle`s class I & III into further types Class I is divided into five types. Class III is divided into three types. Class II has no types.

12. clASS i Type 1 Crowded maxillary anterior teeth. canines may be abnormally positioned, other individual teeth irregularities present.

13. Type 2 Proclined or labioversion of maxillary incisor.

14. Type 3 Linguoversion of maxillary incisor. Anterior crossbite present.

15. Type 4 Incisors & canines normally positioned. Molars & premolars are in buccoversion . Posterior crossbite seen.

16. Type 5 Mesioversion of molar. Molar have moved mesially due to premature loss of teeth anterior to molar.

17. Class III Type 1 Well aligned teeth & dental archs . Edge-edge relationship exists.

18. Type 2 Crowded mandibular incisor. Normally placed lower incisors behind the upper incisors.

19. Type 3 Crowded maxillary incisors. Underdeveloped maxilla. Anterior crossbite present.