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Intro to Fixed Prosthodontics > Week 12 > Flashcards

Week 12 Flashcards

1
Q

what is an anteriorly, superiorly braced position along the articular eminence of the glenoid fossa, with the articular disc interposed between the condyle and eminence

A

centric relation

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2
Q

is CR a joint related position?

A

YES

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3
Q

T/F: CR has NOTHING to do with the teeth, and EVERYTHING to do with the joint (TMJ)

A

TRUE

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4
Q

components of the TMJ

A
  1. articular eminence
  2. condyle
  3. external auditory meatus
  4. superior and inferior lateral pterygoids
  5. retrodiscal tissue
  6. thin superior wall of glenoid fossa
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5
Q

centric relation is the most stable position ___ and ___.

A

orthopedically and musculoskeletally

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6
Q

what has been highly debated for years

A

centric relation

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7
Q

what is a good place to start when planning major restorative work?

A

centric relation

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8
Q

what is the difference between a healthy and unhealthy joint in centric relation?

A

healthy: condyle is anterior and superior
unhealthy: anteriorly displaced disc (internal derangement)

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9
Q

angle and length of condylar rotation (mm)

A

10-13 degrees
20-25 mm

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10
Q

fundamentals of occlusion Wilcox vs. Shil

A

Wilcox: broad stable posterior support and effective anterior guidance

Shil: create posterior contacts that stabilize mandibular position

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11
Q

what is purely hinge movement and is also termed the kinematic axis?

A

horizontal axis of mandibular movement

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12
Q

what creates a rotating condyle and orbiting condyle?

A

vertical axis of mandibular movement

e.g. if moving left, you rotate left and orbit right

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13
Q

what axis moves down and forward

A

sagittal axis

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14
Q

if mandible is moved to the left, the left side is the [nonworking or working] and the right side is the [nonworking or working]

A

left side is working
right side is nonworking

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15
Q

what is the bodily shift of the mandible in the direction of the working side?

A

immediate side shift or Bennett angle

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16
Q

what is a gradual shifting of the mandible during the working side movement?

A

progressive side shift

17
Q

what is the continuation of the Bennett angle as it continues movement

A

progressive side shift

18
Q

what is the posterior determinant of mandibular movementt

A

condyles

19
Q

what is the anterior determinant of mandibular movement

A

contacting teeth:
- posterior teeth provide vertical stops and guide mandible into MI
- anterior teeth provide guidance (canines and Class III lever system)

20
Q

T/F: the closer a tooth is to the determinant, the more it will be influenced by that determinant

A

TRUE

21
Q

what are undesirable contacts that may produce mandibular deviation or may hinder smooth passage to and from intercuspal position?

A

occlusal interferences

22
Q

what is the most destructive occlusal interference?

A

nonworking

23
Q

What occurs when condyles are in the most superoanterior position, posterior teeth in solid and even contact, anterior light contact

A

closure

24
Q

occlusal forces are along what axis of teeth

A

long axis

25
Q

what occurs when working side contacts and disocclude nonworking teeth instantly?

A

lateral excursions

26
Q

what occurs when anterior contacts disocclude posteriors

A

protrusive

27
Q

in ___ posture, posterior contacts are heavier than anterior

A

upright posture

28
Q

what are the 3 occlusal schemes?

A
  1. bilateral balanced
  2. unilateral balance
  3. mutually protects (canine protected)
29
Q

what is the maximum number of teeth in contact in all positions, and excessive wear only used now only with dentures prevent tipping

A

bilateral balanced occlusal scheme for dentures

30
Q

what occlusal scheme is where only working side contacts

A

unilateral balance (group function)

31
Q

what occlusal scheme is when posterior disocclusion is in eccentric movements, most accepted, usually used in large restorative cases and requires good anterior perio?

A

mutually protected occlusal schemes (canine guidance taught at creighton)

32
Q

the angle between the working and nonworking path is greater on teeth located ___ from the condyle.

A

FARTHER

33
Q

what burs to use for proximal reduction

A

888 (gradoville choice) or 169

34
Q

clearance from the adjacent teeth should be what?

A

at lest >0.8 mm (width of explorer)

35
Q

how many mm of occlusal clearance should one have?

A

1-1.5 mm (aim for 1.3 mm bc that’s the length of the ball burnisher

36
Q

what bur to use for Chamfer

A

876 proximally
856 or 876 for everything else

Intro to Fixed Prosthodontics (11 decks)

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