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Occlusion Lecture > DETERMINANTS OF OCCLUSAL MORPHOLOGY > Flashcards

DETERMINANTS OF OCCLUSAL MORPHOLOGY Flashcards

(54 cards)

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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?

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

What is the definition of anterior guidance angle?

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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?

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A

vertical overlap
horizontal overlap

25
What happens to the anterior guidance angle with an increased vertical overlap?
increased angle
26
What happens to the anterior guidance angle with an increased horizontal overlap?
decreased angle
27
What happens if you have an increased anterior guidance angle?
- more vertical component - allows steeper the posterior cusps
28
The nearer a tooth is to the TMJ...
the more the joint anatomy will influence its eccentric movement and the less the anterior teeth influence its movement
29
What are other factors that influence cusp height?
- plane of occlusion - curve of spee - mandibular lateral translation movement
30
What is the plane of occlusion?
imaginary surface that touches the incisal edges of the incisors and cusp tips of the occluding surfaces of the posterior teeth
31
As the plane of occlusion becomes more parallel to the angle of eminence, the posterior cusps get...
shorter
32
What is the curve of spee?
- curve extending from the tip of the mandibular canine along the buccal cusp tips of the mandibular posterior teeth
33
The flatter the plane of occlusion the ______ cusp height
greater
34
If the curve of spee has a short radius the angle at which the mandibular teeth move away from the maxillary teeth will be...
less than with a long radius - cusps will be shorter
35
If the plane of occlusion is rotated more anterior...
taller cusps
36
If the plane of occlusion is rotated more posterior...
shorter cusps
37
The mandibular lateral translation is a __________ _______ of the mandible during lateral movement
bodily sideshift
38
What does the inward movement of the mandible depend on?
- 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
If the temporomandibular ligament is very tight then...
- no lateral translation of mandible - not common
40
What is the lateral translation movement described in...
amount timing direction
41
The greater the amount of lateral translation the _______ the posterior cusps
shorter
42
What are the movements that the rotating condyle makes?
- laterosuperior (shorter cusps) - lateroinferoposterior (taller cusps) - etc.
43
What has the greatest influence on occlusal morphology?
lateral translation timing
44
What are the two types of condylar lateral translation?
early translation late lateral translation
45
What is another name for early translation?
immediate lateral translation (immediate sideshift)
46
What is anther name for late lateral translation?
progressive lateral translation (progressive sideshift)
47
If the condyle guidance is steep what happens to cusps?
taller
48
If anterior guidance is greater vertical overlap what happens to cusps?
taller
49
If anterior guidance is greater horizontal overlap what happens to cusps?
shorter
50
If plane of occlusion is more parallel to the condylar guidance what happens to cusp?
shorter
51
If curve of spee is more acute than the curve what happens to cusps?
shorter
52
If lateral translational movement is greater what happens to cusps?
shorter
53
If lateral translational movement is more superior of the rotating condyle what happens to cusps?
shorter
54
If lateral translational movement is greater than immediate side shift what happens to cusps?
shorter

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