Q8-Vertical Determinants of Occlusal Morphology

Question 1

What is the condylar guidance angle

Answer 1

it is generated by the orbiting condyle when the mandible moves laterally is larger than when the mandibular protrudes straight forward

Question 2

True or False

condylar guidance is considered to be a fixed factor

Answer 2

True

Question 3

Why is condylar guidance a fixed factor

Answer 3

because it is inalterable in a healthy patient; can only be altered by trauma, pathosis, and surgical procedure

Question 4

What are five things that influence the height of cusps and the depths of fossa

Answer 4

condylar guidance
anterior guidance
plane of occlusion
curve of spee
mandibular lateral translation movement

Question 5

The nearer a tooth is the to the TMJ, what will happen

Answer 5

the more the joint anatomy will influence its eccentric movement

Question 6

The nearer a posterior tooth is the the anterior teeth, what will happen

Answer 6

the more the anatomy of the anterior teeth will influence its movement

Question 7

The morphologic characteristics of each posterior tooth must be in harmony with what

Answer 7

those of opposing tooth or teeth during all eccentric mandibular movements

Question 8

Mandibular movement has what components

Answer 8

vertical and horizontal

Question 9

The greater the horizontal overlap, then what

Answer 9

the shorter the posterior cusps

Question 10

Anterior and posterior controlling factos cause the mandibular to do what

Answer 10

move away from the reference (horizontal) plane at the angle degree of the articular eminence posteriorly and the anterior guidance created by the vertical and horizontal overlaps of the anterior teeth

Question 11

For the maxillary premolar to disclude from the mandibular premolar during a protrusive movement, what happens

Answer 11

the cuspal inclines must be less than the poster and anterior controlling factors angle (45º and 60º respectively)

Question 12

This is an imaginary line touching the incisal edges of the maxillary anterior teeth and the cusps of the maxillary posterior teeth

Answer 12

plane of occlusion

Question 13

The more the plane of occlusion diverges from the angle of eminentia, what happens

Answer 13

the longer the cusps may be

Question 14

The more parallel the plane of occlusion to the angle of eminentia, what happens

Answer 14

the shorter the posterior cusps

Question 15

This is a bodily side shift of the mandible that occurs during lateral movements

Answer 15

mandibular lateral translation movement

Question 16

True or False

The less medial the medial wall is from the condyle, the greater the LTM

Answer 16

False; the MORE medial the medial wall is, the greater the LTM

Question 17

When distance exists between the medial wall and medial pole of the orbiting condyle and the TM ligament allows some movement of the rotating condyle, what occurs

Answer 17

LTM movement occurs

Question 18

True or False

With proximity of the medial wall and tight TM ligament, no LTM

Answer 18

True

Question 19

A what radius causes a flatter place of occlusion

Answer 19

longer

Question 20

A what radius causes a more acute place of occlusion

Answer 20

shorter

Question 21

Posterior teeth located distal to the radius will need what type of cusps

Answer 21

will need shorter cusps than those located mesial to the radius

Question 22

Lateral translation movement has what three attributes

Answer 22

direction
amount
timing

Question 23

Direction of lateral translation movement depends on what

Answer 23

primarily on the direction taken by the rotating condyle during bodily movement

Question 24

What are the directions the rotating condyle can take

Answer 24

superior
anterior
inferior
posterior

Question 25

The rotating condyle is capable of moving laterally within an area of what

Answer 25

a 60º cone during LTM;

i.e. laterally superoanterior, laterally inferoposterior

Question 26

As LTM increases, the shift of the mandible distracts what

Answer 26

that the posterior cusps be shorter to permit LT to prevent contact between maxillary and mandibular posterior teeth

Question 27

What are the two effects of timing of the LTM on cusp height

Answer 27

immediate LTM

progressive LTM

Question 28

The more immediate the LTM, the what of the posterior cusp

Answer 28

the shorter the posterior cusp

Question 29

The steeper the condylar guidance…

Answer 29

the taller the posterior cusps

Question 30

The greater the vertical overlap of anterior guidance…

Answer 30

the taller the posterior cusps

Question 31

The greater the horizontal overlap of anterior guidance…

Answer 31

the shorter the posterior cusps

Question 32

The more parallel the plane of occlusion to the condylar guidance…

Answer 32

the shorter the posterior cusps

Question 33

The more acute of the curve of Spee…

Answer 33

the shorter the most posterior cusps

Question 34

The greater the LTM…

Answer 34

the shorter the posterior cusps

Question 35

The more superior the movement of the rotating condyle…

Answer 35

the shorter the posterior cusps

Question 36

The greater the immediate side shift

Answer 36

the shorter the posterior cusps