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Occlusion Lecture COPY kadyn > DETERMINANTS OF OCCLUSAL MORPHOLOGY > Flashcards

DETERMINANTS OF OCCLUSAL MORPHOLOGY Flashcards

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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

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

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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4
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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5
Q

The condylar guidance is considered to be a ________

A

fixed factor

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6
Q

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

A

lingual

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7
Q

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

A

anterior

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8
Q

The anterior guidance is considered to be a ____ factor

A

variable

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9
Q

as the mandibular protrudes or moves laterally, the incisal edges of the mandibular anterior teeth occlude with the …

A

lingual surfaces of the maxillary anterior teeth

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10
Q

how can the anterior guidance of the mandible be changed?

A

pathologic conditions (caries, wear)
dental procedures

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11
Q

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

A

its opposing tooth

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12
Q

What is the vertical component of mandibular movement?

A

supero-inferior movement

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13
Q

What is the horizontal component of mandibular movement?

A

antero-posterior movement

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14
Q

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

A

close to, but not contact

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15
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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16
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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17
Q

What does vertical determinants of mandibular movements influence?

A

height of the cusps
depths of fossae

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18
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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19
Q

What are the posterior controlling factors?

A
  • fixed factors
  • condylar guidance
  • the two TMJs
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20
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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21
Q

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

A

protrusive

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22
Q

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

A

more the condyle must move inferiorly
(greater vertical movement)

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23
Q

The steeper the angle of the eminence the steeper the…

A

posterior cusps of teeth

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24
Q

What are the anterior controlling factors?

A
  • anterior teeth
  • anterior guidance
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25
What can alter anterior guidance?
- restorations - ortho - extractions - caries - habits - tooth wear - anterior guidance is variable! (not fixed)
26
What is the definition of anterior guidance angle?
the angle formed by the intersection of the horizontal plane and the disclusive pathway of the anterior teeth
27
What is the anterior guidance angle influenced by?
vertical overlap horizontal overlap
28
What happens to the anterior guidance angle with an increased vertical overlap?
increased angle
29
What happens to the anterior guidance angle with an increased horizontal overlap?
decreased angle
30
What happens if you have an increased anterior guidance angle?
- more vertical component - allows steeper the posterior cusps
31
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
32
What are other factors that influence cusp height?
- plane of occlusion - curve of spee - mandibular lateral translation movement
33
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
34
As the plane of occlusion becomes more parallel to the angle of eminence, the posterior cusps get...
shorter
35
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
36
The flatter the plane of occlusion the ______ cusp height
greater
37
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
38
If the plane of occlusion is rotated more anterior...
taller cusps
39
If the plane of occlusion is rotated more posterior...
shorter cusps
40
The mandibular lateral translation is a __________ _______ of the mandible during lateral movement
bodily sideshift
41
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
42
the more medial the medial wall is from the condyle, the more ...
lateral translation movement
43
If the temporomandibular ligament is very tight then...
- no lateral translation of mandible - not common - pure arching movement around the rotating condyle
44
What is the lateral translation movement described in...
amount timing direction
45
The greater the amount of lateral translation the _______ the posterior cusps
shorter
46
What are the movements that the rotating condyle makes?
- laterosuperior (shorter cusps) - lateroinferoposterior (taller cusps) - etc.
47
What has the greatest influence on occlusal morphology?
lateral translation timing
48
What are the two types of condylar lateral translation?
early translation late lateral translation
49
What is another name for early translation?
immediate lateral translation (immediate sideshift)
50
the immediate lateral translation shift is seen ______ the condyle begins to translate from the fossa
51
the more the immediate movement the ________ the cusps must be
shorter
52
What is anther name for late lateral translation?
progressive lateral translation (progressive sideshift)
53
If the condyle guidance is steep what happens to cusps?
taller
54
If anterior guidance is greater vertical overlap what happens to cusps?
taller
55
If anterior guidance is greater horizontal overlap what happens to cusps?
shorter
56
If plane of occlusion is more parallel to the condylar guidance what happens to cusp?
shorter
57
If curve of spee is more acute than the curve what happens to cusps?
shorter
58
If lateral translational movement is greater what happens to cusps?
shorter
59
If lateral translational movement is more superior of the rotating condyle what happens to cusps?
shorter
60
If lateral translational movement is greater than immediate side shift what happens to cusps?
shorter

Occlusion Lecture COPY kadyn (19 decks)

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