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D1 Spring - Occlusion & Fixed Pros. > 3/6: Static Factors of Occlusion > Flashcards

3/6: Static Factors of Occlusion Flashcards

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1
Q

What are static factors of occlusion?

A

Characteristics shared by the teeth when they are stationary

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2
Q

What are factors and forces that determine the tooth position?

A
  • labiolingual alignment
  • mesiodistal alignment
  • vertical position
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3
Q

What things are components of tooth position?

A

Muscles
- cheeks, lips, and tongue
- neutral zone
Genetic
- size and shape of arch and teeth -> available space
Habits
Interproximal Contacts
Occlusal contacts

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4
Q

What are interproximal contacts?

A

Maintain tooth position

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5
Q

What is mesial drift?

A

Alveolar bone and gingival fibers

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6
Q

What do occlusal contacts do?

A

Maintain tooth position

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7
Q

What is intra-arch tooth alignment?

A

The relationship of the teeth to each other within the dental arch

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8
Q

What is the ‘plane’ of occlusion?

A

‘Plane’ that curves to fit the occlusal surfaces and incisal edges of all the teeth

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9
Q

Describe the plane of occlusion

A
  • it is not flat
  • teeth positioned in the arches at varying degrees of inclination
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10
Q

Is the mandible concave or convex?

A

Concave

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11
Q

Is the maxilla concave or convex?

A

Convex

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12
Q

What is angulation of the teeth determined by?

A

The long axis of the tooth (crown and root)

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13
Q

What is the angulation of the mandibular anterior teeth?

A

Labially inclined (20 degrees)

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14
Q

What is the angulation of the mandibular premolars?

A

Mesially inclined (6 degrees)

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15
Q

What is the angulation of the mandibular molars?

A

Mesially inclined (10-15 degrees)

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16
Q

What is the angulation of the maxillary anterior teeth?

A

Labially inclined - central incisor greates (28 degrees)

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17
Q

What is the angulation of the maxillary premolar?

A

Mesially inclined (9 degrees)

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18
Q

What is the angulation of the maxillary molars?

A

Mesially inclined (12 degrees)
Crowns of the maxillary molars are tilted distally (and labially)

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19
Q

What is the angulation of the mandibular anterior teeth in the frontal plane?

A

Vertical inclination (0 degrees)

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20
Q

What is the angulation of the mandibular premolars in the frontal plane?

A

1st premolar - labial inclination (9 degrees)
2nd premolar - lingual inclination (9 degrees)

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21
Q

What is the angulation of the mandibular molars in the frontal plane?

A

Lingual inclination (20 degrees)

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22
Q

What is the angulation of the maxillary anterior teeth in the frontal plane?

A

Incisors - distal inclination (2-6 degrees)
Canines - mesial inclination (17 degrees)

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23
Q

What is the angulation of the mandibular premolars in the frontal plane?

A

Slight buccal inclination (5 degrees)

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24
Q

What is the angulation of the mandibular molars in the frontal plane?

A

Buccal inclination (20 degrees)

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25
What is the curve of spee?
Antero-posterior curvature of the occlusal plane
26
Where is the curve of spee concave and convex?
Concave in mandible, convex in maxilla
27
What is the curve of wilson?
Medio-lateral curvature of the occlusal plane
28
Where is the curve of wilson concave and convex?
Concave in the mandible, convex in the maxilla
29
Where are posterior teeth loaded when they occlude?
Axially
30
What are posterior teeth designed to take?
Heavy loads, support the occlusal vertical dimension
31
When anterior teeth occlude, where are they not loaded?
Through their long axis
32
What are anterior teeth not designed for?
Loading
33
What is the occlusal table?
The area defined by the cusp tips and the mesial and distal cusp ridges/arms
34
How much of the width of the tooth is the occlusal table?
50-60% of the buccolingual width of the tooth
35
What does the occlusal table facilitate?
Axial loading
36
What is the inner incline of the occlusal table?
Incline inside the buccal and lingual cusp ridges
37
What is the outer incline of the occlusal table?
Inclines outside the buccal and lingual cusp ridges
38
What is inter-arch alignment?
The relationship of the teeth in one arch to those in the other arch
39
What are the types of arch shapes?
U shaped/square/tapering Symmetricl, smooth in outline
40
Which arch is wider?
Maxilalry
41
Which arch is longer?
Maxillary Max: 128mm long Mand: 126mm long
42
What do the buccal cusps of the mandibular posterior teeth and the lingual cusps of maxillary posterior teeth occlude?
With opposing central fossa areas - to minimize trauma to soft tissue
43
What are supporting/centric/functional/stamp cusps?
Lingual cusps of maxillary teeth and buccal cusps of mandibular teeth
44
What are guiding/non-centric/balancing/shearing cusps?
Buccal cusps of maxillary teeth and lingual cusps of mandibular teeth
45
What is the bucco-occlusal line?
Imaginary line drawn through the buccal cusp tips of the mandibular teeth
46
What is the linguo-occlusal line?
Imaginary line defined by joining the lingual cusp tips of the maxillary teeth
47
What is the central fossa line?
Imaginary line that follows the central grooves and fossa of all the posterior teeth
48
What does the bucco-occlusal line of the mandible occlude?
In the central fossa (CF) line of the maxilla
49
What does the linguo-occlusal line of the mandible occlude?
In the central fossa (CF) line of the mandible
50
What is crossbite?
The opposite of the ideal inter-arch relationship
51
What does the BO line of the maxilla occlude with in crossbite?
CF line of the mandible
52
What does the LO line of the mandible occlude with in crossbite?
CF line of the maxilla
53
What is the net effect of arch length discrepancy?
Tooth to tooth vs. tooth to two teeth relationships
54
Describe the class I molar relationship of the MB cusp of the maxillary first molar
MB cusp of the max first molar is aligned directly over the buccal groove of the mandibular first molar
55
Describe the class I molar relationship of the MB cusp of the mandibular first molar
MB cusp of the mand first molar occludes in the embrasure area between the maxillary second premolar and first molar
56
Describe the class I molar relationship of the ML cusp of the maxillary first molar
ML cusp of the maxillary first molar occludes in the central fossa area of the mandibular first molar
57
Describe the class II molar relationship of the MB cusp of the maxillary first molar
Situated over the embrasure between the mandibular second premolar and first molar
58
Describe the class II molar relationship of the MB cusp of the mandibular first molar
Occludes in the central fossa of the maxillary first molar
59
Describe the class II molar relationship of the DL cusp of the maxillary first molar
Occludes in central fossa of the mandibular first molar
60
Describe the class III molar relationship of the MB cusp of the maxillary first molar
Is situated over the embrasure between the mandibular first and second molar
61
Describe the class III molar relationship of the DB cusp of the mandibular first molar
Occludes in the embrasure between distal marginal ridge of the maxillary second premolar and the mesial marginal ridge of the maxillary first molar
62
Describe the class III molar relationship of the ML cusp of the maxillary first molar
Situated in the mesial pit of the mandibular second molar
63
What is the vertical overlap in a class I?
Distance the maxillary anterior teeth overlap the mandibular anterior teeth in a vertical direction 2-4mm is "normal"
64
What is the horizontal overlap in a class I?
Distance the maxillary anterior teeth overlap the mandibular teeth when measured in a horizontal direction 2-4mm is "normal"
65
What is division 1 in class II anterior teeth?
Great vertical overlap, the mandibular teeth contact the gingival third of the maxillary anterior teeth "deep bite"
66
What is division 2 in class II anterior teeth?
Maxillary incisors are lingually inclined, laterals overlap the centrals labially
67
What is the class III anterior tooth relationship?
End to end relationship Mandibular anterior teeth are so far forward overlapping maxillary anterior teeth

D1 Spring - Occlusion & Fixed Pros. (17 decks)

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