jaw relationships and dynamic occlusion Flashcards
what is the contact relationship of teeth/ equivalent?
occlusion
what is the dynamic relationships of teeth when in sliding contact?
articulation
what is the positional relationship which the mandible bears to the maxilla?
jaw relationship
what is the rest/postural position maintained by?
minimal muscle activity or muscle elasticity
what is the ICP?
intercuspal position
- maximal intercuspation/ interdigitation
what is RCP?
retruded contact position/ ligamentous position
- condyles retruded in glenoid fossa
- teeth in contact 1-2mm posterior to ICP
what muscle retrudes the jaw?
horizontal parts of temporalis
what is OVD?
occlusal vertical dimension
- face height with teeth in ICP
what is RVD?
rest/ postural vertical dimension
- face height with mandible in rest position
what is the freeway space?
space between teeth in rest position
how is freeway space measured?
RVD-OVD
what size should the freeway space be?
2-5mm
what are the anatomical guide planes?
incisal guidance
cuspal inclines
TMJ
what is the working side?
the side to which teeth move
how is the working side guided?
canine guidance
group function
what is the non-working side?
the side away from which the teeth move to
teeth dont contact
what happens to the condyle in the working side?
rotates around vertical axis
lateral bodily movement
what is bennett movement?
lateral bodily movement of the condyle at the working side
what happens to the condyle at the non-working side?
moves downwards
forwards over eminence
move medially
what muscle pulls condyle forward?
lateral pterygoid
