Occlusion

Question 1

What defect might result in a patient opening their mouth too wide?

Answer 1

• 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)

Question 2

What is the normal range of motion for a patient?

Answer 2

40-45mm range apprx

Question 3

What is the range of motion for a patient exhibiting damage to the TMJ?

Answer 3

Anything less than 30mm

Question 4

When the left canine cusp tips are in contact where is the right condyle located?

Answer 4

• Partly down the post slope of the eminence
• Against the medial wall of the fossa

Question 5

Which cusps are most affected by grinding?

Answer 5

The supporting cusps

Question 6

Which muscle is most affected from grinding?

Answer 6

• 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

Question 7

What effect does an increase in vertical overlap have?

Answer 7

The cusps of the posterior teeth may be taller.

Question 8

What do vertical determinates of occlusal morphology have an effect on?

Answer 8

Cusp height and fossa depth

Question 9

What do the horizontal determinates of occlusal morphology have an effect on?

Answer 9

Ridge and groove direction

Question 10

In condylar guidance, the steeper the guidance the ______________?

Answer 10

Taller the posterior cusps

Question 11

With anterior guidance, the greater the vertical overlap, the _______________?

Answer 11

Taller the posterior cusps

Question 12

With anterior guidance the greater the horizontal overlap, the ______________?

Answer 12

Shorter the posterior cusps

Question 13

The greater the distance from the rotating condyle, the ___________?

Answer 13

Wider the angle between laterotrusive and mediorusive pathways

Question 14

The greater the distance from the midsagittal plane, the _________?

Answer 14

The wider the angle between laterotrusive and mediotrusive pathways

Question 15

The greater the lateral translation movement, the __________?

Answer 15

The wider the angle between mediotrusive and laterotrusive pathways

Question 16

The greater the intercondylar distance, the __________?

Answer 16

The smaller the angle between mediotrusive and laterotrusive pathways