Occlusion - Chu

Question 1

What is intra-arch tooth alignment?

Answer 1

the relationship of the teeth to each other within the arch

Question 2

When following the buccal cusp tip line of the mandibular arch, what kind of curve does it make?

Answer 2

Concave

Question 3

T or F: both the anterior and posterior of the mandibular arch are mesially inclined?

Answer 3

True

Question 4

T or F: both the anterior and posterior of the maxillary arch are mesially inclined?

Answer 4

False, The anterior is mexially inclined, but the posterior is distally inclined

Question 5

Is the mandibular arch B or L inclined?

Answer 5

B

Question 6

Is the maxillary arch B or L inclined?

Answer 6

L

Question 7

What is inter-arch tooth alignment?

Answer 7

The relationship of the teeth in one arch compared to the other arch

Question 8

Why is the mandibular arch smaller than the maxillary arch?

Answer 8

Because the incisors are smaller

Question 9

What are centric/functional cusps?

Answer 9

They are what is mainly contacted. It maintains the distance between mandibular and maxillary.

Usually broader, and wider, more blunt

Question 10

What are guiding cusps?

Answer 10

nonfunctional cusps

usually sharper

Question 11

What are protrusive movements?

Answer 11

moving the mandible foward

Question 12

What are laterotrusive movements?

Answer 12

moving the mandible from left to right

Question 13

What are retrusive movements?

Answer 13

moving the mandible posteriorly

Question 14

Is the mandible the only thing that moves?

Answer 14

YES!!!

Question 15

What is a class I molar?

Answer 15

normal

the MB cusp of the first maxillary molar is aligned over the B groove of the first mandibular molar

Question 16

What is a class II molar?

Answer 16

mandible is more distal “overbite”

MB cusp of the first mandibular molar is aligned under the B groove of the first mandibular molar

Question 17

What is a class III molar?

Answer 17

mandible is more mesial “underbite”

MB cusp of the first maxillary molar is aligned over the embrasure of the first and second mandibular molar

Question 18

What is a class I anterior?

Answer 18

Normal occlusion

Question 19

What is class II division I anterior?

Answer 19

Mandible contacts gingival third of maxillary incisors

Question 20

What is class II division II anterior?

Answer 20

Deep bite; mandible is more posterior

Question 21

What is class III anterior “end to end” ?

Answer 21

Mandible is slightly more anterior; mandibular incisors are all touching the incisal edges of the maxillary incisors

Question 22

What is class III anterior “underbite”?

Answer 22

Mandible is extremely anterior

Question 23

What is anterior open bite?

Answer 23

None of the anterior teeth are contacting leaving a large gap

Question 24

What molar class is the most common?

Answer 24

Class I malocclusion

Question 25

What molar class is the least common?

Answer 25

Class III malocclusion

Question 26

What is a molar crossbite?

Answer 26

Where the Buccal cusps of the maxillary and the lingual cusps of the mandibular become the centric cusps

Question 27

What is important about the functional outer aspect (FOA)?

Answer 27

It is the only area of outer incline with functional significance

Question 28

What is MIP?

Answer 28

maximum intercuspation- meaning maximum amount of contacts

Question 29

What is centric relation?

Answer 29

condyle-disk relation position relationship of the mandible to the maxilla when the condyle disks are in the most superior position

Question 30

What are some potential posterior contacts when moving protrusively?

Answer 30

Distal inclines of the maxillary lingual cusps contact the mesial inclines of the mandibular fossae and marginal ridges Mesial inclines of the mandibular buccal cusps contact the distal inclines of the maxillary fossae and marginal ridges

Question 31

Are the potential posterior contacts, when moving protrusively, desirable or undesirable?

Answer 31

Undesireable

Question 32

What are the desirable posterior contacts in laterotrusive movement?

Answer 32

Inner inclines of maxillary buccal cusps and the outer inclines of the mandibular buccal cusps

Question 33

What are the undesirable posterior contacts in the laterotrusive movements?

Answer 33

Outer inclines of maxillary lingual cusps and the inner inclines of the mandibular lingual cusps

Question 34

What are mediotrusive movement?

Answer 34

The opposite contacts of the the working side. So if the jaw moves to the left, it is the movement on the right side of the jaw

Question 35

What are the non-working side contacts?

Answer 35

The inner incline of the maxillary lingual cusps and the inner incline of the mandibular buccal cusps