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occlusion final > final test > Flashcards

final test Flashcards

1
Q

two joints of TMJ

A

ginglymoid and arthodial

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2
Q

ginglymoid movement

A

hinge

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3
Q

arthodial movement

A

gliding

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4
Q

functioning part of mandibular fossa

A

articular eminence

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5
Q

non functioning part of mandibular fossa

A

articular fossa

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6
Q

what ligaments of the mandible limits protrusion

A

stylomandibular

sphenomandibular

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7
Q

what ligament(s) prevents mandible from going too far back

A

colateral ligaments (2 parts)

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8
Q

two parts of collateral ligament

A

internal horizontal portion

outer oblique portion

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9
Q

action of temporal is muscle

A

eleveate and retrude mandible

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10
Q

insertion of temporalis

A

coronoid process
anterior border or ramus
temporal crest

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11
Q

orgin and insertion of medial pterygoid muscle

A

orgin- pterygoid fossa

insertion- medial angle of mandible

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12
Q

lateral pterygoid muscle action

A

both, protrude, depress mandible

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13
Q

orgin and insertion of lat. pterygoid

A

orgin- lateral pterygoid plate

insertion- condylar process of mandible

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14
Q

orgin and insertion of digastric

A

orgin-
post- mastoid notch
ant- medial angle of mandible

insertion-
post and ant.- hyoid

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15
Q

what muscles protrude mandible

A

both lat. pterygoids together

masseter and medial pterygoid

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16
Q

innervatoin of TMJ

A

auriculotemporal (part of CN V)

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17
Q

main innervation of muscle of mastication

A

Trigeminal

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18
Q

3 arteries of the TMJ

A

superficial temporal
middle meningeal
internal maxillary

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19
Q

if the force vector passes through the bite point what does that mean

A

TMJ does not need to be loaded, does not function as a lever

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20
Q

what species is TMJ not loaded?

A

rat

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21
Q

red fox has carnassial teeth meaning what

A

teeth for tearing food

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22
Q

pinnate muscle arrangement is a _____ saving adaptation

A

space

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23
Q

power generating muscle arragnement

A

pinnate

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24
Q

movement muscle arrangement

A

strap

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25
Q

which muscles of mastication are strap?

A

lat. pterygoid

digastrics

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26
Q

most efficient class system (jaw muscle-Joint lever)

A

1st class

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27
Q

lever efficiency depends on ratio of..

A

d1 and d2. decrease this number correlates to increase efficiency

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28
Q

example of 1st class

A

(PFW) axis of cervical spine

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29
Q

example of 2nd class

A

PWF wheelbarrow. front view of mandible

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30
Q

example of 3rd class

A

least efficient, biting, drawbridge

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31
Q

d1 is between which two variable

A

F and W

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32
Q

(MA) mechanical advantage along the mandible _______ with the distance from the TMJ

A

increases

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33
Q

muscle fibers that express ____ types of myosin are found _____ to the joint and vise versa with ____ types

A

fast
close
slow

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34
Q

two phases of closing movement

A

crushing and guiding

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35
Q

chewing stroke on working side

A

incisors and molars start anteriorly at opening and returns from a posterior position

36
Q

great lateral movement when food is ____ into mouth

A

introduced

37
Q

harder food creates ____ chewing strokes

A

broader

38
Q

greatest amount of force during mastication is placed what two teeth area

A

2nd premolar, 1st molar

39
Q

somatic swallowing

A

during swallowing teeth come together in MI position to stabilize the mandible in order for the supra hyoid and infra hyoid to contract and control

40
Q

viceral swallow

A

occurs in infants and adults with no teeth. mandible is braced by placing the tongue forwards and between the dental arches or gum pads

41
Q

M sound used for what

A

evaluate the amount of incisal display at rest

42
Q

functional response of the alveolar bone and gingival fibers surrounding the teeth help them drift how

A

mesial, towards the midline

43
Q

mandibular teeth, all inclined which direction

A

mesial, posterior also slightly lingually

44
Q

max teeth anterior inclined where? posterior?

A

anterior- mesially inclined

post- distall inclined, also bucally

45
Q

two planes of occlusion

A

curve of sped

curve of wilson (both concave)

46
Q

curve of spee

A

anteriorposterior

47
Q

curve of wilson

A

bucall lingual

48
Q

occlusal table

A

area of a posterior tooth between the buccal and lingual cusps

49
Q

which arch is smaller length wise

A

mandibule

50
Q

what is the vertical dimension of occlusion at rest

A

2-3 mm

51
Q

centric cusp do what

A

maintaining the vertical dimension of occlusion and triturate food during mastication

52
Q

noncentric cusp

A

maintain the bolus of food on the occlusal table during mastication, they assist in shearing food and minimize tissue impingement.

53
Q

centric relation

A

anterior-superior most retruded condyle position bilaterally
most retruded functional position of the mandible
teeth not required

54
Q

what ligament in the TMJ limits normal rotational opening movements?

A

outer oblique

55
Q

what ligament in the TMJ limits the posterior movement of the condyle and sic

A

inner horizontal

56
Q

what ligament limits protrusive movement of the mandible

A

stylomandibular

57
Q

in centric relation what is RCP?

A

first tooth contact on arc of closure

58
Q

two movements of border diagram

A

condylar rotation 20-25 mm

condylar translation 50 mm

59
Q

functional range of movement is what

A

diastase between ICP and CR in border diagram

60
Q

movement in transverse plane is called what

A

gothic arch tracing

61
Q

deviations during opening/closing is caused by what

A

usually by disc derangements.

62
Q

deflection caused by what

A

extra or intra intracapsular disorders

63
Q

crepitation

A

multiple gravel like sound and commonly associated with osteoarthritic changes of the articular surfaces of the joint

64
Q

what percentage of people have CR coincide with ICP

A

10%

65
Q

type of disclusion in lateral excursive movements

A 
canine disclusion
balance occlusion (group function)
66
Q

history of occlusion, 1925 sears called it

A

balanced occlusion

67
Q

new centric relationship

A

condyles are in their most superoanterior position. coincides with (MS) musculoskeletally

68
Q

lowest EMG recording of muscles at what two measurements

A

7-8 mm

2-4 mm

69
Q

optimal tooth contacts is what

A

even and simultaneous contact with as many teeth as possible. (less load is transferred to joint)

70
Q

forces on teeth are directed through the ____ _____

A

periodontal ligament

71
Q

axial loading

A

process of directing occlusal forces through the long axis of the tooth

72
Q

axial loading methods…tooth contacts on either _____ or ______

A

cusp tips

relatively flat surfaces that are oriented perpendicular to the long axis

73
Q

axial loading method on cusp tips called what

A

tripodization

74
Q

T/F anterior teeth can with stand greater forces applied to them

A

false, posterior teeth can.

75
Q

which teeth are suited best to withstand horizontal forces

A

canines

76
Q

canine guidance is what

A

max. and mand. canines contact in laterotrusive excursions

this disoccludes the posterior teeth

77
Q

alternative to canine guidance

A

group function

78
Q

which teeth would you rather participate in group function

A

pre molars or MB cusp of 1st molar. posterior = undesirable

79
Q

anterior disclusion is what

A

during protrusive movements you have no posterior contacts

80
Q

T/F you want posterior contacts heavier than anterior?

A

True

81
Q

condylar guidance is considered to be a ______ factor

A

fixed. because is inalterable in a healthy patient.

82
Q

the more the plane of occlusion diverges from the angle of the eminentia=

A

the longer the cusps

83
Q

the more parallel the plane of occlusion to the angle of the eminentia=

A

the shorter the posterior cusps

84
Q

what are two factors affecting bennett movement (side shift, LTM)

A 
medial wall (more medial greater the LTM)
TM ligament
85
Q

posterior teeth located distal to the radius will need ____ cusps than those located mesial to the radius

A

shorter

86
Q

longer radius (curve of spee) =

A

flatter place of occlusion

87
Q

the more immediate the lateral translation, the _____ is the posterior cusp

A

shorter

occlusion final (1 decks)

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