Occlusion L5 - Occlusion Dynamic (jaw relationship and dynamic occlusion) Flashcards
Vertical jaw relationship and dimensions – our teeth when they are slightly apart by few mm is best known as what position?
Rest/postural position
Vertical jaw relationship and dimensions – our teeth when they are together and fully interdigitated?
Intercuspal position (ICP)
Is the Intercuspal position stable or not and why?
Not a stable position because, if you were to lose a tooth then the positions would change.
Is the rest/postural position a stable position or not and why?
It is a stable position because, it is maintained by minimal muscle activity.
In a retruded contact position, describe the position of the condyle?
The condyle is retruded in the glenoid fossa.
What two arbitrary points are used to measure the occlusal vertical dimension?
Nose and lower chin
A Willis gauge is used to measure the rest vertical dimension, which two arbitrary points is used to measure this?
The nose and the mandible
The freeway space is measured how?
Subtracting the RVD with the OVD
The restriction of the TMJ is governed by the positioning of the teeth. How does the positioning of the incisors restrict the mandibles movement?
At rest, the incisors will exhibit a slight overbite and overjet, which help restrict movement.
The restriction of the TMJ is governed by the positioning of the teeth. How does the positioning of the cusps restrict the mandibles movement?
The Intercuspal position.
A wide opening of the jaw exhibits what two movements?
Hinge and slide
What does the movement from the ICP to the RCP represent on the border movement graph?
It represents the ICP overcoming the overbite and overjet.
From RCP to the next point what does that represent?
This represents the pure hinge (small opening)
From RCP to maximum opening what movement would the condyle exhibit?
Hinge and slide
