Occlusion 1 Flashcards
What movement does the temporalis produce?
elevate and retract
Aid in rotation
What movement does the lateral pterygoid produce?
positions disc in closing (superior - SLP)
Protrude and depress mandible and causes lateral movement (inferior - ILP)
What movement does the medial pterygoid produce?
elevate mandible
Lateral movement and protrusion
What movement does the masseter produce?
elevate and protracts
AIDS in lateral movement
What occurs at the tmj during rotational movement?
mandible acts as a hinge around the terminal hinge axis
This is rotation as if it were an angle like this <
No downwards or forwards movement
Condyle and disc remain in articular fossa
what occurs during translational movement?
lateral pterygoid contracts and pulls the disc and condyle
Condyle travels down and forward along the incline of the articular eminence
May also travel laterally
Label possets envelope
ICP = intercuspal position
RCP = retruded contact position
Pr = protrusion
R = retruded axis position
E = edge to edge
T = maximum opening
What occurs at ICP?
tooth position regardless of condylar position
The most comfortable bite and best fit of the teeth together
Usually 1mm anterior to RCP
What occurs at E in possets envelope?
edge to edge
Maxillary teeth slide up palatal surfaces of mandibular anteriors to where in usual edges are in contact
What occurs at Pr?
Protrusion
condyle moves forward and downwards on articular eminence
Only the incisors and canines touch until eventually there are no tooth contacts in full protrusion
What occurs at T?
maximum opening
No tooth contacts
Full translation of condyle over articular eminence
What occurs at R?
retruded axis position
No tooth contact
Terminal hinge axis position
Most superior anterior position of the condylar head in the fossa
What occurs at RCP?
firs tooth contact when mandible is in retruded axis position
What is the working side and the non working side
The working side is the side the mandible moves to
So if I moved my jaw left then left side is working wider
What is the bennet angle?
Th path of the non working side of the mandible during lateral movement compared to mandible in ICP