Determinants of Occlusal Morphology

Question 1

THE FACTORS THAT DETERMINE THE PATTERNS OF

MANDIBULAR MOVEMENT ARE: (2)

Answer 1

the TMJs and anterior teeth

Question 2

TO MAINTAIN HARMONY THE POSTERIOR TEETH NEED TO
PASS CLOSE TO BUT NOT —, THE OPPOSING TEETH
DURING MANDIBULAR MOVEMENT.

Answer 2

CONTACT

Question 3

STRUCTURES THAT CONTROL MANDIBULAR

MOVEMENT: (2)

Answer 3

structures that influence the movement of the posterior portion of the mandible (TMJ)
structures that influence the movement of the anterior portion of the mandible (anterior teeth)

Question 4

THE ANGLE AT WHICH THE CONDYLE MOVES AWAY FROM

A HORIZONTAL REFERENCE PLANE IS REFERED TO AS THE

Answer 4

CONDYLAR GUIDANCE ANGLE.

Question 5

THE CONDYLAR GUIDANCE IS CONSIDERED TO BE A
“—”, SINCE IN THE HEALTHY PATIENT IT IS
UNALTERABLE

Answer 5

FIXED FACTOR

Question 6

the anterior teeth determine how the

Answer 6

anterior portion of the mandible moves

Question 7

as the mandible protrudes or moves laterally, the incisal edges of the manidbular anterior teeth occlude with the

Answer 7

lingual surfaces of the max anterior teeth

Question 8

the steepness of the — surfaces determine the amount of — movement of the mandible

Answer 8

lingual

vertical

Question 9

the anterior guidance is considered to be a

Answer 9

VARIABLE RATHER THAN A FIXED FACTOR

Question 10

anterior guidances CAN BE ALTERED BY

Answer 10

PATHOLOGIC CONDITIONS

(CARIES, WEAR, ETC) OR DENTAL PROCEDURES

Question 11

THE MORPHOLOGY OF THE TOOTH IS INFLUENCED BY THE

Answer 11

PATHWAY IT TRAVELS ACROSS ITS OPPOSING TOOTH OR

TEETH.

Question 12

VERTICAL COMPONENT

Answer 12

supero-inferior movement

Question 13

HORIZONTAL COMPONENT

Answer 13

antero-posterior movement

Question 14

VERTICAL COMPONENT is a function of

Answer 14

SUPERIO-INFERIOR MOVEMENT

Question 15

we want posterior teeth to pass close to, but not contact opposing teeth during

Answer 15

mandibular movement (occlusal harmony)

Question 16

THE LENGTH OF A CUSP AND THE DISTANCE IT
EXTENDS INTO THE DEPTH OF AN OPPOSING
FOSSA DEPENDS ON: (3)

Answer 16

anterior controlling factor of mandibular movement
posterior controlling factor of mandibular movement
the nearness of the cusp to those controlling factors

Question 17

VERTICAL DETERMINANTS:

Answer 17

control the function of the superior inferior movement

cusp height, fossae depth

Question 18

HORIZONTAL DETERMINANTS:

Answer 18

influence the direction of grooves and ridges on the occlusal surfaces and the placement of the cusps in the horizontal plane

Question 19

VERTICAL DETERMINANTS

these factors influence (2)

Answer 19

height of the cusps

depths of the fossae

Question 20

vertical determinants (6)

Answer 20

condylar guidance (p controlling factor)
anterior guidance (a controlling factor)
nearness of the cusp to the controlling factor
plane of occlusion
curve of spee
mandibular lateral translation movement

Question 21

POSTERIOR CONTROLLING FACTORS (3)

Answer 21

fixed factors
condylar guidance
the two TMJs

Question 22

at the mandible is protruded the condyle descends along the

Answer 22

articular eminence

Question 23

the condylar guidance is the angle at which the

Answer 23

condyle moves away from the horizontal reference plane

Question 24

when the mandible makes a lateral movement, the condylar guidance angle is greater than when the mandible makes a

Answer 24

protrusive movement

Question 25

THE STEEPER THE EMINENCE | the more the condyle must move

Answer 25

inferiorly

Question 26

THE STEEPER THE EMINENCE | there is a greater --- movement

Answer 26

vertical

Question 27

THE STEEPER THE EMINENCE | it allows for --- posterior cusps

Answer 27

steeper

Question 28

THE STEEPER THE ANGLE OF THE EMINENCE, | THE STEEPER THE

Answer 28

POSTERIOR CUSPS

Question 29

anterior controlling factors (2)

Answer 29

anterior teeth | anterior guidance

Question 30

anterior teeth | determine how the --- portion of the mandible moves

Answer 30

anterior

Question 31

anterior guidance is altered by (6)

Answer 31

``` restorations ortho extractions caries habits tooth wear ```

Question 32

the anterior guidance is a --- rather than a fixed factor

Answer 32

variable

Question 33

anterior guidance angle

Answer 33

the angle formed by the intersection of the horixontal plane and the disclusive pathway of the anterior teeth

Question 34

anterior guidance angle is influenced by (2)

Answer 34

VO | HO

Question 35

HO:

Answer 35

: stays the same

Question 36

VO:

Answer 36

: varies

Question 37

VO overlap increases

Answer 37

anterior guidance angle increases

Question 38

HO overlap increases

Answer 38

naterior guidance angle decreases

Question 39

increased anterior guidance angle (2)

Answer 39

more vertical component | allows steeper posterior cusps

Question 40

the nearer a tooth is to the TMJ, the -- the joint anatomy will influence its eccentric movement and the -- the anterior teeth influence its movement

Answer 40

more | less

Question 41

other factors that influence cusp height (3)

Answer 41

plane of occlusion curve of spee mandibular lateral translation movement

Question 42

plane of occlusion

Answer 42

an imaginary surface that touches the incisal edges of the incisors and cusp tips of the occluding surfaces of the posterior teeth

Question 43

as the plane of occlusion becomes more parallel to the angle fo the eminence, the posterior cusps must be made

Answer 43

shorter

Question 44

curve of spee

Answer 44

AP curve extending from the tip of the mandibular canine along the buccal cusp tips of the mandibular posterior teeth

Question 45

curvature is described in terms of

Answer 45

length of radius of the curve

Question 46

with a shorter radius, the curve will be more --- than with a longer radius

Answer 46

acute

Question 47

THE FLATTER THE PLANE OF OCCLUSION, | THE

Answer 47

GREATER THE CUSP HEIGHT CAN BE

Question 48

If the Curve of Spee has a SHORT RADIUS:

Answer 48

the ANGLE at which the mandibular teeth move away from the maxillary teeth WILL BE LESS THAN WITH A LONG RADIUS, therefore the CUSPS will need to be SHORTER

Question 49

PLANE OF OCCLUSION | rotated more A (2)

Answer 49

more teeth A to perpendicular line | taller cusps

Question 50

PLANE OF OCCLUSION | rotated more P (2)

Answer 50

more teeth P to perpendicular reference line | shorter cusps

Question 51

EFFECT OF MANDIBULAR LATERAL TRANSLATION MOVEMENT ON CUSP HEIGHT

Answer 51

BENNETT MOVEMENT

Question 52

the mandibular lateral translation is a -- -- of the mandible during lateral movements

Answer 52

bodily sideshift

Question 53

``` HOW MUCH INWARD MOVEMENT? depends on (2) ```

Answer 53

morphology of the medial wall of the fossa on the orbiting side inner portion of the TM ligament attached to the lateral pole of the rotating condyle

Question 54

``` TM LIGAMENT very tight (3) ```

Answer 54

pure arcing movement around the rotating condyle no lateral translation of the mandible not common

Question 55

the more medial the medial wall is from the condyle, the more

Answer 55

LATERAL TRANSLATION MOVEMENT

Question 56

LATERAL TRANSLATION MOVEMENT described in (3)

Answer 56

amount timing direction

Question 57

THE GREATER THE AMOUNT OF LATERAL TRANSLATION, THE --- THE POSTERIOR CUSPS MUST BE

Answer 57

SHORTER

Question 58

ROTATING CONDYLE | may move in a combo of movements (3)

Answer 58

laterosuperior lateroinferioposterior ect

Question 59

laterosuperior movement requires

Answer 59

shorter posterior cusp

Question 60

inferior movement allows

Answer 60

taller cusps

Question 61

lateral translation timing | greatest influence on --- morphology

Answer 61

occlusal

Question 62

translation can occur (2)

Answer 62

early | late

Question 63

EARLY TRANSLATION | called

Answer 63

immediate lateral translation (or immediate sideshift)

Question 64

LATE LATERAL TRANSLATION | called

Answer 64

PROGRESSIVE LATERAL TRANSLATION | or progressive sideshift

Question 65

IMMEDIATE LATERAL TRANSLATION | shift seen before the condyle begins to

Answer 65

translate from the fossa

Question 66

IMMEDIATE LATERAL TRANSLATION | the more the immediate movement, the

Answer 66

shorter the cusps must be

Question 67

Condylar Guidance (2)

Answer 67

Steeper the guidance | Taller cusps

Question 68

Anterior Guidance (4)

Answer 68

Greater vertical overlap Taller cusps Greater horizontal overlap Shorter cusps

Question 69

Plane of Occlusion (2)

Answer 69

More parallel to the condylar guidance Shorter cusps

Question 70

Curve of Spee (2)

Answer 70

More acute the curve | Shorter cusps

Question 71

Lateral translation | movement (3)

Answer 71

Greater the movement Shorter cusps More superior movement of the rotating condyle Shorter cusps Greater immediate side shift Shorter cusps