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occlusion > midterm > Flashcards

midterm Flashcards

1
Q

concerns about amalgam

A

esthetics
weakening of tooth from removed from structure
recurrent caries
sense

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2
Q

comp advs

A

asethetics
bonding
more conserv
less exspensive
reduced merc

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3
Q

composite dis

A

shrink
durability
chip
more skill
dry
time and expense

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4
Q

articulator 4 uses

A

diagnosis
treatment planning
communicate with patients/patient education
fabrication of prostheses/resorations

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5
Q

semi-adjustable articulators:
a.
-condyle in LOWER member
-condylar inclination in the upper member
b.
-condyle on UPPER member
-condylar inclination on the lower membrane

A

a. acron
b. non acron

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6
Q

what kind of articulator do we use

A

Hanau Articulator
Acron (semi-adjustable)

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7
Q

allow only opening and closing movements. type of articulator

A

hinge or non adjustable

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8
Q

the facebow is used to

A

orient the cast in the same relationship to the opening axis of the articulator in 3 planes

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9
Q

what plane do we use for our facebow

A

arbitrary

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10
Q

locates the true transverse horizontal axis of rotation

A

kinematic plane

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11
Q

locates the axis by using anatomical landmarks (uses average measurements to approx. locate axis of rotation)

A

arbitrary plane

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12
Q

what
-goes through both condyles
-around the axis pure rotational movement of mand. occurs
-8 mm under soft tissue in front of tragus

A

terminal hinge axis

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13
Q

point 10mm anterior to center of spherical insert in external auditory meatus and 7mm below frankfort horizontal plane

A

bergstrom point

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14
Q

what is known as the 3rd point of reference on facebow

A

anterior reference point
-needs to be reproducible and repeatable

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15
Q

when to use facebow?

A
  1. cusp teeth are present
  2. interocclusal records are made at an increased OVD
  3. OVD subject to change and alteration in occlusal surfaces are necessary
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16
Q

what bones are involved in chewing

A

maxilla
mandible
temporal bone

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17
Q

components with processes of maxilla

A

body
processes:
-zygomatic
-frontal
-alveolar
-palatine

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18
Q

largest and strongest bone of skill with components:

A

mandible
body and ramus

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19
Q

articulates with cranium
-medial and lateral poles
length 15-20mm
ant-post 8-10mm

A

condyle

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20
Q

squamous portion articulates mand condyle

A

temporal bone

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21
Q

muscles of mastication

A

temporalis
lateral and medial pterygoid
masseter

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22
Q

elevates mand and powerful muscle that provides force for chewing. has superficial and deep head

A

masseter

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23
Q

masseter
superficial head=
deep head=

A

superficial= aids in protrusion
deep=stabilizes

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24
Q

masseter blood supply and nerve supply

A

blood= branch of max artery
nerve= masseter nerve of mand division of CNV

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25
Q

temporalis 3 divisions with actions:

A

anterior= mand is raised vertically

middle= elevates and retrudes mand

posterior= aids in retrusion of mand

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26
Q

blood and nerve supply of temporalis

A

blood= muscular branch of max artery
nerve= deep temporal nerve of mand division of CNV

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27
Q

lateral (external) ptyergoid 2 heads (almost 2 separate muscles)

A

superior lateral and inferior lateral

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28
Q

what muscle? (depresses/protudes)

a. causes condyles to be pulled down the articular eminence and mandible is protuded:

b. causes mediotrusive movement (down, foward, medially):

A

inferior lateral pterygoid actions.

a. bilateral contraction
b. unilateral contraction

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29
Q

superior lateral pterygoid action. (elevates)

inactive when:
active when:

A

-inactive during mand opening
-active only with elevator muscles (closing of mand) and during closure against resistance (eating) aka POWER STROKE

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30
Q

lateraly pterygoid blood and nerve supply

A

blood-muscular branch of max artery
nerve- masseteric or buccal nerve of man division of CNV

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31
Q
  1. elevates mandible
  2. protrudes mandible
  3. unilateral contraction

results in mediotrusion

A

medial (internal) pterygoid

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32
Q

what muscle causes condyles to be pulled down articular eminences and depress mandible?

A

lateral pterygoid

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33
Q

masseter sling

A

masseter and medial pterygoid

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34
Q

suprahyoids as a group

A

geniohyoid
mylohyoid
digastric
stylohyoid

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35
Q

elevates hyoid bone and depress mand when hyoid bone is fixed

A

suprahyoids

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36
Q

what nerve innervates the TMJ

A

trigeminal

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37
Q

what muscle protrudes mandible?

A

lateral pterygoids

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38
Q

DEPRESSION of mandible.

what muscles cause contractions:

causes relaxation:

A

contraction:
-inferior lateral pterygoids
-digastric

relaxation:
-masseter
-medial pterygoids
-temporalis

(opposite of elevation of mand)

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39
Q

ELEVATION of mandible.

contraction:

relaxation:

A

contraction:
-masseter
-medial pterygoid
-temporalis
-superior lateral pterygoid

relax:
-inferior lateral pterygoid
-digastric

(opposite of depression but add superior lat. ptery.)

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40
Q

right lateral mand movement

contraction

relaxation

A

contraction:
-left inferior lateral pteryg

relax:
-right inferior lateral pteryg
-slight relaxation of elevators

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41
Q

left lateral mand movement

contraction

relaxation

A

contraction:
-right inferior lateral pteryg

relax:
-left inferior lateral pterg
-slight relax of elevators

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42
Q

mand protrusion

contraction

A

inferior lateral pterygoids mainly assisted by masseters and medial pterygoids

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43
Q

retrusion of mand

contraction

A

temporalis

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44
Q

what are indications for crown?

A

-caries
-trauma
-endodontically treated posterior teeth
-previous restorations
-where axial and occlusal contours require substantial correction
-extensive coronal destruction

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45
Q

chamfer margin on gold crown?

A

0.5mm

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46
Q

functional cusp reduction on gold crown?

non-functional?

A

(mand functional cusp-buccal)
1.5mm also for central groove

(mand non-functional cusp-lingual)
1.0mm

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47
Q

where do you make retention groove

A

on functional cusp side (buccal)

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48
Q

functional cusp bevel measurements

A

1.5mm tapers to 1.0mm

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49
Q

what is the sequence of crown prep?

A
  1. occlusal reduction/functional cusp bevel
  2. axial reduction
  3. proximal reduction
  4. secondary retentive features
  5. margination
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50
Q

dimension of reduction for facial and lingual:

A

0.5-1mm

51
Q

axial reduction:

A

.5-1

52
Q

ability to replicate the intraoral surface details

A

accuracy

53
Q

ability to retain its absolute dimensional size over time

A

dimensional stability

54
Q

ability to resist tearing in thin sections

A

tear resistance

55
Q

factors responsible for success of impression material
1
2
3

A

easy to manipulate, comfortable for patient, and inexpensive

56
Q

sodium
potassium
triethanolamine alginate

A

active ingredients for irreversible hydrocolloid impression material

57
Q

potassium alginate
calcium sulfate (reactor)
diatomaceous earth

A

few ingredients of alginate
(for some reason i had these three highlighted)

58
Q

influence alginate setting time by altering

A

temp of water

59
Q

mixing alignate time

A

45secs to 1 min

60
Q

thickness of alginate impression between tray and tissues should be at least

A

3mm

61
Q

alginate hydrocolloid materials are strain-rate dependent. tear strength is ______ when the impression is removed with a snap

A

increased

62
Q

working time is:

a. The amount of time from when you mix a substance to
when it hardens

b. The time to use a workable mix, one that maintains a uniform consistency to perform one or more tasks

c. Aand B

A

b

63
Q

The time to use a workable mix, one that maintains a uniform consistency to perform one or more tasks

A

working time

64
Q

The amount of time from when you mix a substance to
when it hardens

A

setting time

65
Q

proposes when mixed with water, plater enters into colloidal state thru SOL-GEL mech

A

colloidal theory

66
Q

rehydrated plaster particles join together thru hydrogen bonding to the sulfate groups to form the set material

A

hydration theory

67
Q

based on dissolution of plaster and instant recrystallization of gypsum followed by interlocking of crystals to form set solid

A

dissolution precipitation theory

68
Q

chemical added decreases setting time:

increases setting time:

A

decrease: accelerator

increase: retarder

69
Q

stone used to process denture casts because strong and denture easy to remove after processing
(yellow)

A

type III stone

70
Q

if patient needs minimal restorations, this is the position the restorations are made in

A

MI

71
Q

when condyle is in most super anterior position in the articular fossae, resting against posterior slopes of articular eminences with articular discs interposed

A

CR

72
Q

joint where mandible articulates with base of cranium

A

TMJ

73
Q

more than 3 bones
-condyle, temporal, articular disc

A

compound joint

74
Q

allows more than one type of movement

A

complex joint

75
Q

joint implies hinging movement=
implies gliding=

implies both=

A

hinging: ginglymoid
gliding= arthrodial

both=ginglymoarthrodial

76
Q

contacts with synovial fluid

A

synovial joint

77
Q

made of dense fibrous connective tissue
non-innervarted and avascular

A

articular disc

78
Q

articular disc shape
concave=
concavo-convex=

A

concave= inferior part
concavo-convex=superior part

79
Q

articular disc is divided into 3 SAGITTAL sections:
anterior zone
middle or intermediate zone
posterior

which is thinnest and which is thickest

A

thinnest= middle
thickest=posterior

post>ant>middle

80
Q

articular surface of the condyle functions on the ______ of the disc

A

intermediate (middle) zone

81
Q

articular disc divided into 2 FRONTAL sections:
1
2

which is thicker?

A

medial and lateral

thicker medially

82
Q

-most superficial layer of articular surfaces (condyle and fossa)
-unlike other synovial joints, this layer is made of dense fibrous connective tissue rather than hyaline cartilage; less susceptible to aging and better ability to repair

A

articular zone

83
Q

contains undifferentiated mesenchymal cells and is responsible for proliferation of articular cartilage in response to loads

A

proliferative zone

84
Q

3D network of collagen offering resistance to lateral and compressive forces

A

fibrocartilaginous zone

85
Q

made up of chrondocytes and chrondoblasts

A

calcified zone

86
Q

synovial joint.
all areas of joint not involved in articulation (internal surfaces of cavities) are covered with

A

specialized endothelial cells that form synovial lining

-produce synovial fluid

87
Q

movement of fluid from one area of joint cavity to another; prevents friction

A

boundary librication

88
Q

articular surfaces absorb some of the fluid, increased absorption during function, metabolic exchange

A

weeping lubrication

89
Q

disc innervation and blood suplly

A

mand branch of CNV and superfcial temporal artery-

90
Q

-attaches articular disc to tympanic plate
-connective tissue
-lot of elastic fibers
-stretches as joint is moved forward

A

superior retrodiscal lamina

(posterior attachments of disc)

91
Q

-collagenous attachment (not elastic)
-attaches posterior of disc to the posterior margin of articular surface of condyle

A

inferior retrodiscal lamina
(posterior attachment of disc)

92
Q

what happens in inferior joint compartment?

superior joint compartment?

A

inferior= rotation
superior=translation

93
Q

-collateral/discal ligaments
-capsular ligament
-temporalmandibular ligament

A

functional ligaments

94
Q

-sphenomandibular ligament
-stylomandibular ligament

A

accessory ligaments

95
Q

ligament that surrounds joint like curtain

A

capsular ligament/joint capsule

96
Q

-thickening of capsular ligament on lateral aspect
-two parts: outer oblique (prevent over-rotation) and inner horizontal (PAIN)

A

temporalmandibular ligament

97
Q

(movement)
occurs in inferior joint compartment

A

rotational movement

98
Q

(movement)
occurs in superior joint compartment

A

translation movement

99
Q

4 anatomic determinants of movement

A

right and left tmj
teeth/occlusion
neuromusculature

100
Q

process of turning about an axis.
occurs when mouth opens and closes around fixed point within condyles

A

rotation

101
Q

rotation occurs for the first ______mm of opening

A

20-25mm

102
Q

3 planes rotation movement may occur

A

sagittal plane around horizontal axis
horizontal plane around vertical
frontal plane around sagittal

103
Q

-this movement is clinically identifiable and recordable
-only rotational movement that can be isolated clinically
-**this movement occurs only when mandible is in CR

A

rotation in sagittal plane around horizontal axis

104
Q

every point in an object(mandible) simultaneously moving in the same direction with same velocity

A

translation

105
Q

depression of mand (beyond 25mm) and protrusion

A

translation

106
Q

during lateral movement
condyle on side towards which mandible moves (rotating condyle)

A

working side condyle

107
Q

this is the condyle on side opposite to which mandible moves (orbiting condyle)

A

non-working side

108
Q

angle at which condyle moves away from horizontal reference plane

A

condylar angle

109
Q

a. condyle moves forward and downwards
b. condyles move down posterior slope of articular eminence
c. can use this movement to record condylar guidance angle

A

during protrusion

110
Q

angle formed by the intersection of protrusive and non-working condylar paths as viewed in sagittal plane
5-10 degrees
-medial wall steeper than posterior slope of articular eminence

A

Fischer’s angle

111
Q

during a lateral movement, this is the condyle on the side towards which mandible moves

A

working

112
Q

in left lateral movement, working condyle would be

A

left

113
Q

angle at which NWS condyle moves medially away from sagittal reference plane as viewed in horizontal plane during lateral movement (lateral movement)

A

bennett angle

114
Q

T/F
in most people, MIP coincides with CR

A

false

115
Q

condyle-disc seembly is anterior and inferior and/or medial or lateral

A

maximal intercuspal position or max intercuspation

116
Q

habitual postural of mandible when patient is resting comfortably in upright position and condyles are in neutral unstrained position in glenoid fossae
teeth arent touching

-muscles aren’t completely relaxed

A

PP
postural position (PRP)

117
Q

used to determine OVD in edentulous patients or patients with severely won dentition

A

postural position (PRP)

118
Q

outer range of movement is reproducible and called

A

border movements

119
Q

combination of border movements in all 3 planes

A

envelop of motion

3 planes are:

  1. sagittal
  2. horizontal
  3. frontal
120
Q

average distance between CR and MIP

A

1.25mm

121
Q

what determines tooth position

A

muscles
genetics
habits

122
Q

anterior-posterior curvature of occlusal plane. concave in mandible, convex in maxilla

A

curve of spee

(curve of wilson is side to side from frontal view)

123
Q
A

occlusion (9 decks)

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