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Occlusion Lecture > DETERMINANTS OF OCCLUSAL MORPHOLOGY > Flashcards

DETERMINANTS OF OCCLUSAL MORPHOLOGY Flashcards

1
Q

The factors that determine the patterns of mandibular movement are…

A
  • temporomandiublar joints
  • anterior teeth
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2
Q

What are the structures that control mandibular movement?

A

structures that influence the movement of the posterior portion of the mandible (TMJs) and the anterior prortion of the mandibule (teeth)

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3
Q

The angle at which the condyle moves away from a horizontal reference plane is refered to as…

A

condylar guidance angle

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4
Q

The condylar guidance is considered to be a ________

A

fixed factor

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5
Q

The steepness of the _______ surfaces determine the amount of vertical movement of the mandible

A

lingual

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6
Q

The _______ teeth determine how the anteior portion of the mandibule moves

A

anterior

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7
Q

The anterior guidance is considered to be a ____ factor

A

variable

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8
Q

How can the anterior guidance of the mandible be changed?

A

pathologic conditions (caries, wear)
dental procedures

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9
Q

The morphology of the tooth is influenced by the pathway it travels across…

A

its opposing tooth

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10
Q

What is the vertical component of mandibular movement?

A

supero-inferior movement

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11
Q

What is the horizontal component of mandibular movement?

A

antero-posterior movement

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12
Q

We want posterior teeth to pass ___________ opposing teeth during mandibular movement

A

close to, but not contact

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13
Q

The length of the cusp and the distance it extends into the depth of an opposing fossa depends on…

A
  1. anterior controlling factor
  2. posterior controlling factor
  3. the nearness of the cusp to those controlling factors
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14
Q

What do horizontal determinants of mandibular movements influence?

A

direction of the grooves and ridges on the occlusal surfaces and the placement of the cusps

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15
Q

What does vertical determinants of mandibular movements influence?

A

height of the cusps
depths of fossae

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16
Q

What are the vertical determinants?

A
  • condylar guidance
  • anterior guidance
  • nearness of cusp to controlling factor
  • plane of occlusion
  • curve of spee
  • mandibular lateral translation movement
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17
Q

What are the posterior controlling factors?

A
  • fixed factors
  • condylar guidance
  • the two TMJs
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18
Q

What is the condylar guidance?

A
  • as the mandibule is protruded the condyle descends along the articular eminence
  • the angle at which the condyle moves away from the horizontal reference plane
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19
Q

The steeper the eminence, the _____ the condyle must move _______

A

more the condyle must move inferiorly

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20
Q

The steeper the angle of the eminence the steeper the…

A

posterior cusps of teeth

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21
Q

What are the anterior controlling factors?

A
  • anterior teeth
  • anterior guidance
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22
Q

What can alter anterior guidance?

A
  • restorations
  • ortho
  • extractions
  • caries
  • habits
  • tooth wear
  • anterior guidance is variable!
23
Q

What is the definition of anterior guidance angle?

A

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

24
Q

What is the anterior guidance angle influenced by?

A

vertical overlap
horizontal overlap

25
Q

What happens to the anterior guidance angle with an increased vertical overlap?

A

increased angle

26
Q

What happens to the anterior guidance angle with an increased horizontal overlap?

A

decreased angle

27
Q

What happens if you have an increased anterior guidance angle?

A
  • more vertical component
  • allows steeper the posterior cusps
28
Q

The nearer a tooth is to the TMJ…

A

the more the joint anatomy will influence its eccentric movement and the less the anterior teeth influence its movement

29
Q

What are other factors that influence cusp height?

A
  • plane of occlusion
  • curve of spee
  • mandibular lateral translation movement
30
Q

What is the plane of occlusion?

A

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

31
Q

As the plane of occlusion becomes more parallel to the angle of eminence, the posterior cusps get…

32
Q

What is the curve of spee?

A
  • curve extending from the tip of the mandibular canine along the buccal cusp tips of the mandibular posterior teeth
33
Q

The flatter the plane of occlusion the ______ cusp height

34
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…

A

less than with a long radius
- cusps will be shorter

35
Q

If the plane of occlusion is rotated more anterior…

A

taller cusps

36
Q

If the plane of occlusion is rotated more posterior…

A

shorter cusps

37
Q

The mandibular lateral translation is a __________ _______ of the mandible during lateral movement

A

bodily sideshift

38
Q

What does the inward movement of the mandible depend on?

A
  • morphology of the medial wall of the fossa on orbiting side
  • inner portion of the TM ligament attached to the lateral pole of the rotating condyle
39
Q

If the temporomandibular ligament is very tight then…

A
  • no lateral translation of mandible
  • not common
40
Q

What is the lateral translation movement described in…

A

amount
timing direction

41
Q

The greater the amount of lateral translation the _______ the posterior cusps

42
Q

What are the movements that the rotating condyle makes?

A
  • laterosuperior (shorter cusps)
  • lateroinferoposterior (taller cusps)
  • etc.
43
Q

What has the greatest influence on occlusal morphology?

A

lateral translation timing

44
Q

What are the two types of condylar lateral translation?

A

early translation
late lateral translation

45
Q

What is another name for early translation?

A

immediate lateral translation (immediate sideshift)

46
Q

What is anther name for late lateral translation?

A

progressive lateral translation (progressive sideshift)

47
Q

If the condyle guidance is steep what happens to cusps?

48
Q

If anterior guidance is greater vertical overlap what happens to cusps?

49
Q

If anterior guidance is greater horizontal overlap what happens to cusps?

50
Q

If plane of occlusion is more parallel to the condylar guidance what happens to cusp?

51
Q

If curve of spee is more acute than the curve what happens to cusps?

52
Q

If lateral translational movement is greater what happens to cusps?

53
Q

If lateral translational movement is more superior of the rotating condyle what happens to cusps?

54
Q

If lateral translational movement is greater than immediate side shift what happens to cusps?

Occlusion Lecture (17 decks)

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