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Occlusion and Fixed > Lecture 8 Static Forces of Occlusion > Flashcards

Lecture 8 Static Forces of Occlusion Flashcards

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 do alignment and occlusion of the dentition determine

A

-the tooth position
- intra-arch alignment
- inter arch alignment

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3
Q

what factors and forces determine the tooth position

A

-labiolingual alignment
- mesiodistal alignment
- vertical position
-muscles
-genetics
-habits

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4
Q

what muscles are involved in tooth position

A

cheeks,lips and tongue
- neutral zone

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5
Q

what do genetics determine about tooth position

A

size and shape of the arch and teeth ->available space

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6
Q

what maintains tooth position

A
  • interproximal contacts
  • occlusal contacts
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7
Q

what does mesial drift affect

A

alveolar bone and gingival fibers

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8
Q

what is intra arch tooth alignment

A

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

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9
Q

what is the plane of occlusion defined as

A

plane that curves to fit the occlusal surfaces and incisial edges of all the teeth

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10
Q

describe the plane of occlusion

A
  • not flat
  • concave on the mandible
  • convex on the maxilla
  • teeth positioned in the arches at varying degrees of inclination
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11
Q

what is the angulation of the teeth determined by

A

the long axis of the tooth (crown and root)

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12
Q

what planes are there in angulation of the teeth

A

-sagittal plane
- frontal plane

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13
Q

describe the angulation of mandibular teeth in the sagital plane

A
  • anterior teeth: labially inclined 20 degrees
  • premolars: mesially inclined 6 degrees
  • molars: mesially inclined 10-15 degrees
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14
Q

describe the angulation of the maxillary teeth in the sagittal plane

A
  • anterior teeth: labially inclined- central incisor greatest at 28 degrees
    -premolars: mesially inclined 9 degrees
  • molars: mesially inclined 12 degrees- crowns of the maxillary molars tilted distally and labially
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15
Q

describe the angulation of mandibular teeth in frontal plane

A

-anterior teeth: vertical inclination 0 degrees
- premolars: 1st premolar- labial inclination of 9 degrees. 2nd premolar- lingual inclination of 9 degrees
-molars: lingual inclination of 20 degrees

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16
Q

describe the angulation of maxillary teeth in the frontal plane

A
  • anterior teeth: incisors: distal inclination 2-6 degrees. canine- mesial inclination of 17 degrees
    -premolars: slight buccal inclination of 5 degrees
  • molars: buccal inclination of 20 degrees
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17
Q

what is the curve of spee

A
  • antero posterior curvature of the occlusal plane
    -concave in the mandible, convex in the maxilla
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18
Q

what is the curve of wilson

A

-medio lateral curvature of the occlusal plane
- concave in the mandible, convex in the maxilla

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19
Q

what is the net effect of angulation on posterior teeth

A

-when they occlude they are loaded axially
-designed to take heavy loads and support the occlusal vertical dimension

20
Q

what is the net effect on angulation on anterior teeth

A

-when they occlude they are not loaded through their long axis
- not designed for loading

21
Q

what is the occlusal table

A

the area defined by the cusp tips and the mesial and distal cups ridges/arms

22
Q

occlusal table is _____% of the buccolingual width of the tooth

A

50-60%

23
Q

what does the occlusal table facilitate

A

axial loading

24
Q

what are the inclines of the occlusal table and describe each

A

-inner incline: inclines inside the buccal and lingual cusp ridges
- outer inclines: inclines outside the buccal and lingual cusp ridges

25
Q

what is interarch tooth alignment

A

the relationship of the teeth in one arch to those in the other arch

26
Q

what are the different way to describe arch shape and size

A
  • U shaped/square/ tapering
  • symmetrical, smooth in outline
27
Q

which arch is wider

A

maxillary

28
Q

which arch is longer

A

maxillary

29
Q

what is the length of each arch

A

-maxillary: 128 mm long
- mandibular: 126 mm long

30
Q

what is the net effect of normal arch width

A
  • the buccal cusps of the mandibular posterior teeth and the lingual cusps of maxillary posterior teeth occlude with the opposing central fossa areas
  • minimize trauma to soft tissue
    -supporting/centric/functional/ stamp cusps
  • guiding/non-centric/balancing/shearing cusps
31
Q

what is the bucco-occlusal line

A

imaginary line drawn through the buccal cusp tips of the mandibular teeth

32
Q

what is the linguo occlusal line

A

imaginary line defined by joining the lingual cusp tips of the maxillary teeth

33
Q

what is the central fossa line

A

imaginary line that follows the central grooves and fossa of all the posterior teeth

34
Q

what are the interarch relationships

A
  • bucco occlusal line of the mandible occludes in the central fossa line of the maxilla
  • linguo occlusal line of the maxilla occludes in the central fossa line of the mandible
35
Q

a crossbite is the opposite of what relationship

A

the ideal interarch relationship

36
Q

what is a crossbite defined as

A

-the bucco occlusal line of the maxilla occludes with the CF line of the mandible
- the LO line of the mandible occludes with the CF line of the maxilla

37
Q

what is the net effect of arch length discrepancy

A

-tooth to tooth vs tooth to two teeth relationships
- cusp- marginal ridge vs cusp-fossa relation

38
Q

what are the common occlusal relationships of the posterior teeth

A
  • relationship between the maxillary and mandibular first molars
  • angles class 1 is ideal occlusion from an orthodontic perspective
39
Q

what is defined in the angles class 1 molar relationship

A
  • MB cusp of the maxillary first molar is aligned directly over the buccal groove of the mandibular first molar
  • MB cusp of the mandibular first molar occludes in the embrasure area between the maxillary second premolar and first molar
  • ML cusp of the maxillary first molar occludes in the central fossa area of the mandibular first molar
40
Q

what is defined in the angles class II molar relationship

A

-MB cusp of the maxillary first molar is situated over the embrasure between the mandibular second premolar and first molar
- MB cusp of the mandibular first molar occludes in the central fossa of the maxillary first molar
- DL cusp of the maxillary first molar occludes in the central fossa of the mandibular first molar

41
Q

what is defined in the angles class III molar relationship

A

-MB cusp of the maxillary first molar is situated over the embrasure between the mandibular first and second molar
- 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
- ML cusp of the maxillary first molar is situated in the mesial pit of the mandibula r second molar

42
Q

what is vertical overlap is class I

A

-distance the maxillary anterior teeth overlap the mandibular anterior teeth in a veritical direction
- usually 2-4 mm

43
Q

what is horizontal overlap in class I

A

-distance the maxillary anterior teeth overlap the mandibular teeth when measured in a horizontal direction
- 2-4mm

44
Q

what is division 1 of class II anterior teeth

A

-great vertical overlap, the mandibular teeth contact the gingival third of the maxillary anterior teeth- “Deep bite”

45
Q

what is division 2 of class II anterior teeth

A

-maxillary incisors are lingually inclined
- laterals overlap the centrals labially

46
Q

describe the class III anterior tooth relationships

A

-end to end relationship
- mandibular anterior teeth are so far forward overlapping maxillary anterior teeth

Occlusion and Fixed (14 decks)

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