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Occlusion and Fixed > Lecture 12 Determinants of Occlusal Morphology I > Flashcards

Lecture 12 Determinants of Occlusal Morphology I Flashcards

1
Q

what are the factors that determine the patterns of mandibular movements

A

-TMJs
- anterior teeth

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2
Q

to maintain harmony the posterior teeth need to pass close to but _____ the opposing teeth during mandibular movement

A

not contact

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3
Q

what are the structures that control mandibular movement

A

-TMJs influence posterior movement of mandible
- anterior teeth influence anterior movement of mandible

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4
Q

what is the condylar guidance angle

A

the angle at which the condyle moves away from the horizontal plane

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5
Q

condylar guidance is considered to be a _____

A

“fixed factor”

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6
Q

as the mandible protrudes or moves laterally the incisal edges of the mandibular anterior teeth occlude with ____

A

the lingual surfaces of the maxillary anterior teeth

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7
Q

what determines the amount of vertical movement of the mandible

A

the steepness of the lingual surfaces

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8
Q

the anterior teeth determine how____

A

the anterior portion of the mandible moves

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9
Q

the anterior guidance is considered to be a _____

A

variable factor

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10
Q

what is the morphology of the tooth influenced by

A

the pathway it travels across its opposing tooth or teeth

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11
Q

what are the components of mandibular movement

A

vertical component
horizontal component

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12
Q

the length of a cusp and the distance it extends into the depth of an opposing fossa depends on:

A
  1. anterior controlling factor of mandibular movement
  2. posterior controlling factor of mandibular movement
  3. the nearness of the cusp to those controlling factors
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13
Q

what do vertical determinants control

A

-the function of the superior inferior movenet
- cusp height and fossa depth

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14
Q

what do horizontal determinants influence

A

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

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15
Q

what are the vertical determinants

A

-condylar guidance
-anterior guidance
-nearness of the cusp to the controlling factor
- plane of occlusion
- curve of spee
mandibular lateral translation movement

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16
Q

what are the posterior controlling factors

A

-fixed factors
- condylar guidance
-TMJs

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17
Q

as the mandible is protruded the condyle descends along ____

A

the articular eminence

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18
Q

is the condylar guidance angle greater when the mandible makes a lateral movement or when the mandible makes a protrusive movement

A

when the mandible makes a lateral movement

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19
Q

the steeper the eminence:

A
  • the more the condyle must move inferiorly
  • there is greater vertical movement
  • allows for steeper posterior cusps
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20
Q

what is anterior guidance altered by

A

-restorations
-orthodontics
-extractions
-caries
- habits
-tooth wear

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21
Q

what is the anterior guidance angle

A

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

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22
Q

what is the anterior guidance angle influenced by

A

vertical overlap and horizontal overlap

23
Q

what does increased VO do to anterior guidance angle? increased HO?

A

increased VO: increases it
increased HO: decreases it

24
Q

the nearer a tooth is to the TMJ, the ____ the joint anatomy will influence its ecentric movement and the ____the anterior teeth influence its movement

A

more; less

25
Q

what are other factors that influence cusp height

A

-plane of occlusion
-curve of spee
- mandibular lateral translation movement

26
Q

as the plane of occlusion becomes more parallel to the angles of eminence the posterior cusp tips must be made _____

A

shorter

27
Q

what is the curve of spee

A

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

28
Q

with a short radius the curve will be more _____ than with a longer radius

A

acute

29
Q

the flatter the plane of occlusion the ____the cusp height can be

A

greater

30
Q

if the curve of spee has a short radius: the angle at which the mandibular teeth move away from the maxillary teeth will be ____ than with a long radius , therefore the cusps will need to be _____

A

less; shorter

31
Q

if the plane of occlusion is rotated more anterior:

A

-more teeth anterior to perpendicular line
- taller cusps

32
Q

if the plane of occlusion is rotated more posterior

A

-more teeth posterior to perpendicular reference line
-shorter cusps

33
Q

what is the bennett movement

A

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

34
Q

what does how much inward movement there is depend on

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

35
Q

describe the TM ligament

A

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

36
Q

in lateral translation movement, the more medial the medial wall is from the condyle___

A

the more lateral translation movement

37
Q

the lateral translation movement is described in

A

-amount
-timing
-direction

38
Q

the greater the amount of lateral translation the ____the posterior cusps must be

A

shorter

39
Q

what does laterosuperior movement require about cusp tips

A

shorter

40
Q

what does lateral inferior movement allow about cusp tips

A

taller

41
Q

what is the greatest influence on occlusal harmony

A

lateral translation timing

42
Q

what is early translation called

A

immediate lateral translation or immediate shideshift

43
Q

what is late lateral translation called

A
  • progressive lateral translation or progressive sideshift
44
Q

when is immediate lateral translation seen

A

before the condyle begins to translate from the fossa

45
Q

the more immediate the movement the -___the cusps must be

A

shorter

46
Q

the steeper the condylar guidance:

A

the taller the cusps

47
Q

the greater the vertical overlap:

A

the taller the cusps

48
Q

the greater the horizontal overlap

A

the shorter the cusps

49
Q

the more parallel plane of occlusion to condylar guidance

A

the shorter the cusps

50
Q

the more acute the curve of spee:

A

the shorter the cusps

51
Q

the greater the lateral translation movement:

A

the shorter the cusps

52
Q

the more superior movement of the rotating condyle

A

the shorter the cusps

53
Q

the greater the immediate side shift:

A

the shorter the cusps

Occlusion and Fixed (14 decks)

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