Quiz 2 - Occlusion

Question 1

Where do you measure maximum opening

Answer 1

from maxillary to mandibular incisors

Question 2

What is the normal range of maximum opening

Answer 2

53-58mm

Question 3

What is considered a restricted range of maximum opening or a healthy range in the elderly

Answer 3

less than 40mm

Question 4

This is a shift in the jaw midline during opening that disappears with continued opening; returns to midline

Answer 4

mandibular deviation upon opening

Question 5

What causes mandibular deviation

Answer 5

disc degranulation

Question 6

This is a shift in the midline to one side that becomes greater with opening and is maintained in that position at maximum opening; does not return to midline

Answer 6

mandibular deflection upon opening

Question 7

Whats causes mandibular deflection

Answer 7

extra or intracapsular disorders

Question 8

What causes a clicking or popping sound in the TMJ

Answer 8

disc derangement as a result of the condylar movement necessary to get past the disc during translation

Question 9

What causes crepitation (gravel-like sound)

Answer 9

osteoarthritic changes of the articular surfaces of the joint

Question 10

What was the point of finding centric relation in clinic

Answer 10

to identify the first contact

Question 11

90% of the population has this in regards to centric relation

Answer 11

1.25-1.0mm slide

Question 12

10% of the population has this in regards to centric relation

Answer 12

coincides with MI

Question 13

Where is the MB cusp of the mandibular first molar in class I relationship

Answer 13

In the embrasure space between the maxillary second premolar and first molar

Question 14

Where is the MB cusp of the mandibular first molar is class II relationship

Answer 14

In the central fossa area of the maxillary first molar

Question 15

Where is the DB cusp of the mandibular first molar in a class III relationship

Answer 15

In the embrasure space between the maxillary second premolar and first molar

Question 16

Which class relationship has 2 divisions

Answer 16

class II

Question 17

This division of class II is much more prominent in the overbite

Answer 17

division 1

Question 18

What are the two types of disclusion in lateral excursive movements

Answer 18

canine disclusion

balance occlusion; group function (3 or more post teeth occlude)

Question 19

Where are the two types of occlusal contact in protrusive movement

Answer 19

disclusion of posterior teeth

protrusive posterior contacts