Occlusion 1 Flashcards
what type of joint is the TMJ?
synovial condylar and hinge joint
what is a facebow used for?
to record the relationship of the maxilla to the terminal hinge axis & rotation of the mandible
what is translation of the condyle?
- lateral pterygoid contracts
- articular disc & condyle begin to move
- travel downwards & forwards along the incline of the articular eminence
What does ICP stand for on a Posselts Envelope diagram?
intercuspal position
- tooth position
- the comfortable bite
- maximum interdigitation of teeth
What does E stand for on a Posselts Envelope diagram?
edge to edge
- teeth slide forward from ICP guiding on palatal surfaces of anterior teeth
- incisal edges of upper & lower incisors touch
What does Pr stand for on a Posselts Envelope diagram?
protrusion
- condyle moves forwards & downwards on articular eminence
- only incisors +/- canines touch
- no posterior tooth contacts
What does T stand for on a Posselts Envelope diagram?
maximum opening
- no tooth contacts
- mouth wide open
- full translation of the condyle over the articular eminence
What does R stand for on a Posselts Envelope diagram?
retruded axis position
- no tooth contacts
- most superior anterior position of the condylar head in the fossa
- terminal hinge axis
What does RCP stand for on a Posselts Envelope diagram?
retruded contact position
- first tooth contact when the mandible is in retruded axis positon
- ICP is approx. 1mm anterior to RCP in 90% of population
If you were to say the right mandibular side is the ‘working side’ what does this mean?
mandible moves towards the right hand side
What is lateral translation of the mandible also known as…?
Bennet movement
what controls lateral translation of the mandible?
lateral pterygoids
what is the Bennet angle?
the path of the non working condyle in the horizontal plane during lateral excursion
