6. Occlusion and Jaw Relationships Flashcards
There are … teeth in permanent dentition. … in primary
32
20
How is skeletal anatomy involved in occlusion?
- relationship between
- size of mandible and maxilla
- relative positions of them
How are cephalometrics used in occlusion?
- use a lateral radiograph of skull to access facial and dentoskeletal relationships
- used to plan orthodontics and surgery
- detailed determination of how dental arches and teeth relate
Class 1 of skeletal occlusion
- mandibular dental base is centrally related to maxillary
Class 2 of skeletal occlusion
mandibular dental base is retruded relative to maxillary
Class 3 of skeletal occlusion
mandibular dental base is protruded relative to maxillary
Adults typically have … incisors, … canines, … premolars and … molars
8
4
8
12
It is now known that molar relationship is or isn’t consistently determine by jaw relationship
isn’t
Classification of molars is dependent on what?
- position of MB cusp of the first maxillary molar
- to the buccal groove of the first mandibular molar
The horizontal incisal overlap is called?
overjet
The vertical incisor overlap is called?
overbite
Define ‘occlusion’
- contacts between teeth
2 ways to consider occlusion
Why?
- as static and dynamic
- teeths move and occlusion changes
- relationship between upper and lower teeth as they move against each other in function
Static occlusion is … and dynamic occlusion is …
- intercuspal position
- excursions/movements e.g lateral, protrusive
What guides the movement of the jaw?
- joints
- muscles
- teeth
- incisors
- canines
- multiple teeth
