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occlusion > Cuspal Arrangement of Teeth and Occlusal Morphology > Flashcards

Cuspal Arrangement of Teeth and Occlusal Morphology Flashcards

1
Q

5 determinants of tooth position

A 
lips and cheeks
tongue
proximal contacts
occlusal contacts
oral habits
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2
Q 
Forces of mastication 
normal?
maximum where? 
dentures?
\+ implications on gender
A

Male is greater than female

Molar - more force than incisor teeth

normal chewing is about 25% of maximum force

Dentures – only get 25% of force of natural dentition

  • varies with age and diet
  • as you get older chewing is not as efficient
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3
Q

definition of occlusal stability

A

equalization of contacts that prevents tooth movement after closure

stable = open and close in a repeatable pattern

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4
Q

inter-arch relationship of teeth

A

where the occluding surfaces of the teeth are intercuspated to resist the vertical and horizontal physiologic forces

part of maintaining stability

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5
Q

interarch relationships for dental stability - forces

A

relationship of the interarch articulation allows the forces to be transmitted to attachment apparatus ALONG THE LONG AXIS OF THE TOOTH

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6
Q

interarch relationships for dental stability - space

A

Opposing teeth should meet solidly from a vertical dimension of occlusion (VDO) vertical dimension of rest (VDR) to a point that is acceptable to allow for ADEQUATE INTEROCCLUSAL REST SPACE (freeway space = VDR-VDO)

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7
Q

free way space

A

VDR - VDO

space at rest usually about 3 mm and can be produced after patient says the word ‘Emma’

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8
Q

interarch relationships for dental stability - contacts

A

contacts during a working side movement of the mandible should DISARTICULATE THE TEETH ON THE NON-WORKING SIDE

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9
Q

interarch relationships for dental stability - excursions

A

anterior and lateral excursions should be compatible with the posterior cuspal anatomy to AVOID posterior interferences

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10
Q

condylar guidance

A

angle at which the condyles descend along the articular eminence

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11
Q

protrusive records are made in order to adjust?

A

angle at which the condyles descend along the articular eminence (condylar guidance)

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12
Q

shape of the articular disc

A

biconcave

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13
Q

function of plane of occlusion

A

arranged to permit maximum use of tooth contacts during function

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14
Q

occlusal plane in sagittal plane

A

curve of spee

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15
Q

occlusal plane in frontal plan

A

curve of wilson

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16
Q

curve of spee
definition
view
importance

A

posterior to anterior along the buccal cusp of the canine to the last molar
viewed in sagittal plane

helps maintain anatomy of teeth and function

17
Q

curve of wilson
definition
view
importance

A

from buccal cusp to lingual cusp through the lingual and buccal acorss the arch

viewed from frontal

18
Q

classification of cusps

A

Supporting = centric cusps or functional

Guiding = non-centric, guiding, shearing

19
Q

supporting cusps

functions and characteristics

A

function/centric cusps
LINGUAL/palatal of upper
mandibular buccal cusps

  1. maintain VDO
  2. play major role in mastication
  3. rounded shape
20
Q

guiding cusps

functions and characteristics

A

non-centric, guiding, shearing
maxillary buccal and mandibularl lingual

  1. assist in shearing food
  2. sharp tips
  3. minimize tissue impingement and to maintain the bolus of food on the occlusal table during mastication
21
Q

posterior cuspal relationship

A

the mandibular buccal cusps occlude in the central fossae of the maxillary teeth

the maxillary lingual cusps occlude in the central fossae of the opposing

22
Q

posterior crossbite

A

mandibular lingual cusps in central fossae
maxillary buccal in central fossa
opposite of normal
- the functional switch

23
Q

Buccooclusal line

linguocclusal line

A

connects buccal cusps

connects lingual cusps in arch

24
Q

outer functional cusp inclines

A

the functional OUTER ASPECT of the centric cusp is the only area of an outer incline with functional significance - it is GUIDING
GUIDE THE CUSP INTO THE MIP

25
Q

functional cusp inclines (three)

A

supporting - INNER
guiding - OUTER SURFACE
guiding - INNER

26
Q

Guiding inclines of maxillary

A

guiding inclines of the maxillary teeth are the surfaces responsible for the characteristics of anterior guidance

27
Q

occlusal table

A

area of major forces of mastication

28
Q

chewing surface

A

this is NOT cusp tip to cusp tip

  • in the fossa
  • could be 50-60% of occlusal table
29
Q

four determinants of mandibular motion

A
  1. right condyle
  2. left condyle
  3. muscles
  4. dentition
30
Q

Class I

A

Orgonathic Profile occurs 72% of time

MB cusp of the maxillary first molar is aligned directly over the buccal groove of mandibular 1st molar

31
Q

Class II

A

Mesial buccal cusp of maxillary first molar is in the ebrasure area between the mandibular 2nd premolar and 1st manddibular molae

Protruded maxilla and retruded mandible

excessive overjet or horizontal overlap

32
Q

Class II Division 1

A

proclined (flared out) maxillary anteriors - lower lip can be behind the maxillary anteriors and push them outward

33
Q 
class ii division ii
implications
A

maxillary anteriors pushed lingual or straight

results in steep anterior guidance

34
Q

what type of lever is our jaw?

A

Class III lever - like a stapler and have the effort BETWEEN the fulcrum (condyle) and the load

35
Q

Class II occlusion

A

Distal occlusion

36
Q

Class III occlusion

A

MB cusp of the maxillary first molar occludes in the embrasure area between the mandibular 1st and 2nd molar

Mesial occlusion with anterior crossbite

prognathic profile

37
Q

what surfaces of the teeth are responsible for guiding the cusps in lateral movements?

A

outer surfaces of functional cusps

inner surfaces of the guiding

38
Q

angles class i - anterior teeth

A 
vertical overlap (2-3 mm)
horizontal overlap (minimal)

responsible for anterior guidance (diocclusion of posterior teeth and interferences)

39
Q

angles class iii - anteriors

A

edge to edge or anterior crossbite

occlusion (10 decks)

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