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Occlusion Lecture > Static Factors of Occlusion > Flashcards

Static Factors of Occlusion Flashcards

1
Q

What are the factors and forces that determine tooth position?

A
  • labiolingual alignment
  • mesiodistal alignment
  • vertical position
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2
Q

What affects tooth position?

A
  • muscles
  • genetics
  • habits
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3
Q

What is the intra-arch tooth alignment?

A

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

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4
Q

What is the plane of occlusion?

A

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

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5
Q

What are the characteristics of the plane of occlusion?

A
  • not flat
  • concave on mandible
  • convex on maxilla
  • teeth positioned in the arches at varying degrees of inclination
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6
Q

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

A

labially inclined
- 20 degrees

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7
Q

What is the angulation of the premolar mandibular teeth in the sagittal plane?

A

mesially inclined
- 6 degrees

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8
Q

What is the angulation of the molar mandibular teeth in the sagittal plane?

A

mesially inclined
- 10-15 degrees

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9
Q

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

A
  • labially inclined
  • central incisor the greatest
  • 28 degrees
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10
Q

What is the angulation of the premolar maxillary teeth in the sagittal plane?

A

mesially inclined
- 9 degrees

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11
Q

What is the angulation of the molar maxillary teeth in the sagittal plane?

A

mesially inclined
- 12 degrees
- crowns of maxillary molars are tilted distally and labially

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12
Q

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

A

vertical inclination
- 0 degrees

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13
Q

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

A
  • 1st premolar: labial inclination (9 degrees)
  • 2nd premolar: lingual inclination (9 degrees)
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14
Q

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

A

lingual inclination
- 20 degrees

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15
Q

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

A
  • incisors: distal inclination (2-6 degrees)
  • canines: mesial inclination (17 degrees)
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16
Q

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

A

slight buccal inclincation
- 5 degrees

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17
Q

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

A

buccal inclination
- 20 degrees

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18
Q

What is the curve of spee?

A
  • antero-posterior curvature of the occlusal plane
  • concave in mandible
  • convex in maxilla
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19
Q

What is the curve of wilson?

A
  • medio-lateral curvature of the occlusal plane
  • concave in mandibe
  • convex in maxilla
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20
Q

What is this?

A

curve of spee

21
Q

What is this?

A

curve of Wilson

22
Q

When posterior teeth are occluded they are loaded…

A

axially

23
Q

Why are posterior teeth loaded axially?

A

designed to take heavy loads and support the occlusal vertical dimension

24
Q

When anterior teeth are occluded they are not loaded through…

A

their long axis

25
Q

Why are anterior teeth not loaded through their long axis?

A

not designed for loading

26
Q

What is the occlusal table?

A

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

27
Q

Occlusal table is _______% of the buccolingual width of the tooth

A

50-60%

28
Q

What does the occlusal table facilitate?

A

axial loading

29
Q

Whcih inclines are inside the buccal and lingual cusp ridges and which inclines are outside?

A

inner inclines - inside
outer inclines - outside

30
Q

What is the inter-arch tooth alignment?

A

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

31
Q

Which arch is longer?

A

maxillary arch is longer

32
Q

Which arch is wider?

A

maxillary arch is wider

33
Q

What is the bucco-occlusal (BO) line?

A

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

34
Q

What is the linguo-occlusal (LO) line?

A
  • imaginary line defined by joining the lingual cusp tips of the maxillary teeth
35
Q

What is the central fossa (CF) line?

A
  • imaginary line that follows the central grooves and fossa of all the posterior teeth
36
Q

The _______ line of the mandible occludes in the central fossa (CF) line of the maxilla

A

bucco-occlusal (BO)

37
Q

The ______ line of the maxilla occludes in the central fossa (CF) line of the mandible

A

linguo-occlusal (LO)

38
Q

What is the opposite of the ideal inter-arch relationship?

A

crossbite

39
Q

What line of the maxilla does the CF line occlude with in the mandible during crossbite?

A

(BO) bucco-occlusal

40
Q

What line of the mandible does the CF line occlude with in the maxilla during crossbite?

A

LO linguo-occlusal

41
Q

What angles class is ideal occlusion from an orthodontic perspective?

A

class I

42
Q

What is a class I molar relationship?

A
  • MB cups of the maxillary 1st molar is alinged over the buccal groove of the mandibular 1st molar
  • MB cups of the mandibular 1st molar occludes in the embrasure area between the maxillary second premolar and first molar
  • ML cups of the maxillary 1st molar occludes in the central fossa area of the mandibular first molar
43
Q

What is a class II molar relationship?

A
  • MB cups of the maxillary 1st molar is situated over the embrasure between the mandibular 2nd premolar and 1st molar
  • MB cups of the mandibular 1st molar occludes in the central fossa of the maxillary 1st molar
  • DL cusp of the maxillary 1st molar occludes in the central fossa of the mandibular 1st molar
44
Q

What is a class III molar relationship?

A
  • MB cups of the maxillary 1st molar is situated over the embrasure between the mandibular 1st and 2nd molar
  • DB cusp of the mandibular 1st molar occludes in the embrasure between distal marginal ridge of the maxillary 2nd premolar and mesial marginal ridge of the maxillary 1st molar
  • ML cusp of the maxillary 1st molar is situated in the mesial pit of the mandibular second molar
45
Q

What is the vertical overlap in class I?

A

2-4 mm

46
Q

What is the horizontal overlap in class I?

A

2-4 mm

47
Q

What are the two divisions of the class II anterior teeth?

A

D1: great vertical overlap, mandibular teeth contact the gingival third of the maxillary anterior teeth (Deep bite)

D2: maxillary incisors are lingually inclined (lateral overlap the centrals labially)

48
Q

What are the two types of class III tooth relationships?

A
  • end-to-end relationship
  • mandibular anterior teeth are so far forward they overlap maxillary anterior teeth

Occlusion Lecture (17 decks)

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