Occlusion Flashcards
What defect might result in a patient opening their mouth too wide?
- damage to first the ligaments and secondarily to the musculature
- subluxation of the mandible (this means that the mandible has moved so far anteriorly, that it is anterior to the inferior portion of the articular eminence)
What is the normal range of motion for a patient?
40-45mm range apprx
What is the range of motion for a patient exhibiting damage to the TMJ?
Anything less than 30mm
When the left canine cusp tips are in contact where is the right condyle located?
- Partly down the post slope of the eminence
- Against the medial wall of the fossa
Which cusps are most affected by grinding?
The supporting cusps
Which muscle is most affected from grinding?
- Correct answer is most likely: Masseter
- Next best answer is: Temporalis
- Third best answer is: Medial Pterygoid
- Fourth best answer is: Lateral Pterygoid
- Fifth best answer is: Sternocleidomastoid
What effect does an increase in vertical overlap have?
The cusps of the posterior teeth may be taller.
What do vertical determinates of occlusal morphology have an effect on?
Cusp height and fossa depth
What do the horizontal determinates of occlusal morphology have an effect on?
Ridge and groove direction
In condylar guidance, the steeper the guidance the ______________?
Taller the posterior cusps
With anterior guidance, the greater the vertical overlap, the _______________?
Taller the posterior cusps
With anterior guidance the greater the horizontal overlap, the ______________?
Shorter the posterior cusps
The greater the distance from the rotating condyle, the ___________?
Wider the angle between laterotrusive and mediorusive pathways
The greater the distance from the midsagittal plane, the _________?
The wider the angle between laterotrusive and mediotrusive pathways
The greater the lateral translation movement, the __________?
The wider the angle between mediotrusive and laterotrusive pathways
