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Occlusion > Determinants of Occlusal Morphology > Flashcards

Determinants of Occlusal Morphology Flashcards

1
Q

THE FACTORS THAT DETERMINE THE PATTERNS OF

MANDIBULAR MOVEMENT ARE: (2)

A

the TMJs and anterior teeth

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2
Q

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

A

CONTACT

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3
Q

STRUCTURES THAT CONTROL MANDIBULAR

MOVEMENT: (2)

A

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)

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4
Q

THE ANGLE AT WHICH THE CONDYLE MOVES AWAY FROM

A HORIZONTAL REFERENCE PLANE IS REFERED TO AS THE

A

CONDYLAR GUIDANCE ANGLE.

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5
Q

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

A

FIXED FACTOR

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6
Q

the anterior teeth determine how the

A

anterior portion of the mandible moves

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7
Q

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

A

lingual surfaces of the max anterior teeth

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8
Q

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

A

lingual

vertical

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9
Q

the anterior guidance is considered to be a

A

VARIABLE RATHER THAN A FIXED FACTOR

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10
Q

anterior guidances CAN BE ALTERED BY

A

PATHOLOGIC CONDITIONS

(CARIES, WEAR, ETC) OR DENTAL PROCEDURES

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11
Q

THE MORPHOLOGY OF THE TOOTH IS INFLUENCED BY THE

A

PATHWAY IT TRAVELS ACROSS ITS OPPOSING TOOTH OR

TEETH.

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12
Q

VERTICAL COMPONENT

A

supero-inferior movement

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13
Q

HORIZONTAL COMPONENT

A

antero-posterior movement

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14
Q

VERTICAL COMPONENT is a function of

A

SUPERIO-INFERIOR MOVEMENT

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15
Q

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

A

mandibular movement (occlusal harmony)

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16
Q

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

A

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

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17
Q

VERTICAL DETERMINANTS:

A

control the function of the superior inferior movement

cusp height, fossae depth

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18
Q

HORIZONTAL DETERMINANTS:

A

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

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19
Q

VERTICAL DETERMINANTS

these factors influence (2)

A

height of the cusps

depths of the fossae

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20
Q

vertical determinants (6)

A 
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
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21
Q

POSTERIOR CONTROLLING FACTORS (3)

A

fixed factors
condylar guidance
the two TMJs

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22
Q

at the mandible is protruded the condyle descends along the

A

articular eminence

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23
Q

the condylar guidance is the angle at which the

A

condyle moves away from the horizontal reference plane

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24
Q

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

A

protrusive movement

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25
Q

THE STEEPER THE EMINENCE

the more the condyle must move

A

inferiorly

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26
Q

THE STEEPER THE EMINENCE

there is a greater — movement

A

vertical

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27
Q

THE STEEPER THE EMINENCE

it allows for — posterior cusps

A

steeper

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28
Q

THE STEEPER THE ANGLE OF THE EMINENCE,

THE STEEPER THE

A

POSTERIOR CUSPS

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29
Q

anterior controlling factors (2)

A

anterior teeth

anterior guidance

30
Q

anterior teeth

determine how the — portion of the mandible moves

A

anterior

31
Q

anterior guidance is altered by (6)

A 
restorations
ortho
extractions
caries
habits
tooth wear
32
Q

the anterior guidance is a — rather than a fixed factor

A

variable

33
Q

anterior guidance angle

A

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

34
Q

anterior guidance angle is influenced by (2)

A

VO

HO

35
Q

HO:

A

: stays the same

36
Q

VO:

A

: varies

37
Q

VO overlap increases

A

anterior guidance angle increases

38
Q

HO overlap increases

A

naterior guidance angle decreases

39
Q

increased anterior guidance angle (2)

A

more vertical component

allows steeper posterior cusps

40
Q

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

A

more

less

41
Q

other factors that influence cusp height (3)

A

plane of occlusion
curve of spee
mandibular lateral translation movement

42
Q

plane of occlusion

A

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

43
Q

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

A

shorter

44
Q

curve of spee

A

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

45
Q

curvature is described in terms of

A

length of radius of the curve

46
Q

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

A

acute

47
Q

THE FLATTER THE PLANE OF OCCLUSION,

THE

A

GREATER THE CUSP HEIGHT CAN BE

48
Q

If the Curve of Spee has a SHORT RADIUS:

A

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

49
Q

PLANE OF OCCLUSION

rotated more A (2)

A

more teeth A to perpendicular line

taller cusps

50
Q

PLANE OF OCCLUSION

rotated more P (2)

A

more teeth P to perpendicular reference line

shorter cusps

51
Q

EFFECT OF MANDIBULAR
LATERAL TRANSLATION
MOVEMENT ON CUSP
HEIGHT

A

BENNETT MOVEMENT

52
Q

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

A

bodily sideshift

53
Q 
HOW MUCH INWARD MOVEMENT?
depends on (2)
A

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

54
Q 
TM LIGAMENT
very tight (3)
A

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

55
Q

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

A

LATERAL TRANSLATION MOVEMENT

56
Q

LATERAL TRANSLATION
MOVEMENT
described in (3)

A

amount
timing
direction

57
Q

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

A

SHORTER

58
Q

ROTATING CONDYLE

may move in a combo of movements (3)

A

laterosuperior
lateroinferioposterior
ect

59
Q

laterosuperior movement requires

A

shorter posterior cusp

60
Q

inferior movement allows

A

taller cusps

61
Q

lateral translation timing

greatest influence on — morphology

A

occlusal

62
Q

translation can occur (2)

A

early

late

63
Q

EARLY TRANSLATION

called

A

immediate lateral translation (or immediate sideshift)

64
Q

LATE LATERAL TRANSLATION

called

A

PROGRESSIVE LATERAL TRANSLATION

or progressive sideshift

65
Q

IMMEDIATE LATERAL TRANSLATION

shift seen before the condyle begins to

A

translate from the fossa

66
Q

IMMEDIATE LATERAL TRANSLATION

the more the immediate movement, the

A

shorter the cusps must be

67
Q

Condylar Guidance (2)

A

Steeper the guidance

Taller cusps

68
Q

Anterior Guidance (4)

A

Greater vertical overlap
Taller cusps

Greater horizontal overlap
Shorter cusps

69
Q

Plane of Occlusion (2)

A

More parallel to the condylar
guidance
Shorter cusps

70
Q

Curve of Spee (2)

A

More acute the curve

Shorter cusps

71
Q

Lateral translation

movement (3)

A

Greater the movement
Shorter cusps

More superior movement of the
rotating condyle
Shorter cusps

Greater immediate side shift
Shorter cusps

Occlusion (15 decks)

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