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Occlusion Lecture > Static Factors of Occlusion > Flashcards

Static Factors of Occlusion Flashcards

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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

Characteristics shared by the teeth when they are stationary

A

Static Factors of Occlusion

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3
Q

What factors determine alignment and occlusion of the dentition?

A

-factors and forces that determine tooth position (labiolingual, mesiodistal alignment, and vertical position)
-intra-arch alignment
-inter-arch alignment

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4
Q

What affects tooth position? (3)

A
  • muscles (cheeks, lips, tongue..in neutral state)
  • genetics (size and shape of arch and teeth–> available space)
  • habits (ex: chewing on pen, mouth breather, etc.)

factors and forces that determine tooth position (labiolingual, mesiodistal alignment, and vertical position)

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5
Q

Interproximal and occlusal contacts help maintain ___

A

tooth position

Interproximal Contacts: mesial drift –> alveolar bone and gingival fibers

–if no contact, teeth will move

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6
Q

What do the size and shape of teeth affect?

A

available space

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7
Q

the relationship of the teeth to each other within the (same) dental arch

A

intra-arch tooth alignment

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8
Q

Plane of occlusion: the plane that curves to fit the ___ and ____ of all the teeth

A

occlusal surfaces; incisal edges

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9
Q

What are the characteristics of the plane of occlusion?

shape on each arch?

A
  • not flat
  • concave on mandible
  • convex on maxilla (ex: buccal cusp higher than lingual)
  • teeth positioned in the arches at varying degrees of inclination
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10
Q

What is the angulation of the teeth determined by?

A

long axis of the tooth (crown and root)

–angulation in Sagittal and Frontal Planes

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11
Q

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

A

labially inclined
- 20 degrees

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12
Q

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

A

mesially inclined
- 6 degrees

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13
Q

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

A

mesially inclined
- 10-15 degrees

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14
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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15
Q

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

A

mesially inclined
- 9 degrees

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16
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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17
Q

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

A

vertical inclination
- 0 degrees

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18
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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19
Q

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

A

lingual inclination
- 20 degrees

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20
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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21
Q

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

A

slight buccal inclincation
- 5 degrees

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22
Q

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

A

buccal inclination
- 20 degrees

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23
Q

What is the curve of spee?

What is the shape in max vs mand?

A
  • antero-posterior curvature of the occlusal plane
  • concave in mandible
  • convex in maxilla
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24
Q

What is the curve of wilson?

What is the shape in max vs mand?

A
  • medio-lateral curvature of the occlusal plane
  • concave in mandibe
  • convex in maxilla
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25
What is this?
curve of spee ## Footnote AP Curve
26
What is this?
curve of Wilson ## Footnote ML Curve
27
# Net Effect of Angulation: When posterior teeth are occluded they are loaded...
axially
28
Why are posterior teeth loaded axially?
designed to take heavy loads and support the occlusal vertical dimension
29
# Net Effect of Angulation: When anterior teeth are occluded they are not loaded through...
their long axis
30
Why are anterior teeth not loaded through their long axis?
not designed for loading
31
the area defined by the cusp tips and the mesial and distal cups ridges/arms
the occlusal table
32
Occlusal table is _______% of the buccolingual width of the tooth
50-60%
33
What does the occlusal table facilitate?
axial loading
34
# Occlusal Table: Which inclines are inside the buccal and lingual cusp ridges and which inclines are outside?
inner inclines - inside outer inclines - outside
35
the relationship of the teeth in one arch to those in the other arch
inter-arch tooth alignment
36
Which arch is longer?
maxillary arch is longer ## Footnote Max arch: 128mm long Mand arch: 126mm long
37
Which arch is wider?
maxillary arch is wider
38
# Net Effect of normal arch width: The buccal cusps of mandibular posterior teeth and the lingual cusps of the maxillary posterior teeth occlude with the opposing central fossa areas.....why is this relevant?
It works to minimize trauma to soft tissue
39
Which cusps are the supporting/centric/stamp cusps? | tooth and arch
Lingual cusps of maxillary teeth and buccal cusps of mandibular teeth ## Footnote functional cusps!!!!
40
Which are the guiding/non-centric/balancing/shearing cusps?
Buccal cusps of maxillary teeth and lingual cusps of mandibular teeth
41
What is the bucco-occlusal (BO) line? | what arch?
an imaginary line drawn through the buccal cusp tips of the mandibular teeth
42
What is the linguo-occlusal (LO) line? | what arch?
- imaginary line defined by joining the lingual cusp tips of the maxillary teeth
43
What is the central fossa (CF) line?
- imaginary line that follows the central grooves and fossa of all the posterior teeth
44
# Interarch Relationships: The _______ line of the mandible occludes in the central fossa (CF) line of the maxilla
bucco-occlusal (BO)
45
# Interarch Relationships: The ______ line of the maxilla occludes in the central fossa (CF) line of the mandible
linguo-occlusal (LO)
46
What is the opposite of the ideal inter-arch relationship?
crossbite
47
What line of the maxilla does the CF line occlude with in the mandible during crossbite?
(BO) bucco-occlusal ## Footnote Buccal is the non-functional cusp---opposite of ideal occlusion
48
During crossbite--Which mandibular cusps occlude with the CF line in the Maxilla?
LO linguo-occlusal
49
What angles class is ideal occlusion from an orthodontic perspective?
class I
50
What is a class I molar relationship?
- 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
51
# ID:
Class I Molar Relationship
52
# ID:
Class II Molar Relationship
53
What is a class II molar relationship?
- 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
54
# ID:
Class III Molar Relationship
55
What is a class III molar relationship?
- 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
56
What is the vertical overlap in class I?
2-4 mm ## Footnote distance the maxillary anterior teeth overlap the mandibular anterior teeth in a vertical direction
57
What is the horizontal overlap in class I?
2-4 mm ## Footnote distance the maxillary anterior teeth overlap the mandibular teeth when measured in a horizontal direction
58
What are the two divisions of the class II anterior teeth?
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)
59
What are the two types of class III tooth relationships?
* end-to-end relationship * mandibular anterior teeth are so far forward they overlap maxillary anterior teeth
60
# ID:
Anterior Open Bite
61
# ID:
Class I
62
Class II
63
Class III

Occlusion Lecture (20 decks)

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