Introduction TO CLASSIFICATION OF MALOCLLUSION
- 2. DEFINITION: Occlusion: The normal relation of the occlusal inclined planes of the teeth when the jaws are closed . Malocclusion:It is a misalignment or incorrect relation between the teeth of two dental arches when they approach each other as the jaws closed. Classification of malocclusion:- Advantaged: 1.Helps in diagnosis and treatment planning . 2.Helps in visualizing and understanding the problem associated with that malocclusion. 3.Helps in communicating the problem . 4.Comparison of various malocclusion is made easy by classification.
- 3. Types of malocclusion and their terminologies: Intra-arch malocclusions. Inter-arch malocclusions. Skeletal malocclusions. 1. Intra-arch malocclusions include :variation in individual tooth position and malocclusion affecting a group of teeth within an arch. Distal inclination or distal tipping. Mesial inclination . Lingual inclination or retroclination. Buccal inclination or proclination. Mesial displacement . Distal displacement. Lingual displacement. Buccal displacement.
- 5. Rotations Disto lingual or mesio buccal rotation Mesio lingual or disto buccal rotation. Transposition. Supraversion. Infraversion. 2. INTER-ARCH MALOCCLUSION: These inter-arch malocclusion can occur in sagittal ,vertical or the transverse plane. 1.Sagittal plane malocclusions : upper and the lower arches are abnormally related to each other in a sagittal plane. A.Prenormal occlusion: lower arch is more forwardly placed when the patient bites in centric occlusion. B.post normal occlusion: lower arch is more distally placed when patient bites in centric occlusion.
- 6. PRENORMAL OCCLUSION. NORMAL O. POST NORMAL O.
- 7. 2. Vertical plane malocclusions: Deep bite .(excessive vertical overlap b/w u n l anteriors) Open bite.(no vertical overlap)
- 8. 3. Transverse plane malocclusion. It includes various types of crossbite.
- 9. 3. SKELETAL MALOCCLUSION. It is caused due to abnormalities in maxilla and mandible . It can be in size,position,or relationship between the jaws .it can also occur in 3planes i.e., sagittal,vertical n transverse plane In transverse plane theses skeletal malocclusion is termed in terms ofcrossbite ..as narrow maxilla ...wide mandible etc., In sagittal in termed of Retrognathism and Prognathism. In vertical plane abnormal variations can be in affect to the lower facial height.