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Occlusion > Fixed Prosth and Prep > Flashcards

Fixed Prosth and Prep Flashcards

1
Q

For a prep for zirconia and gold, what type of prep should be performed?

A

Shoulder prep

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2
Q

For a prep for zirconia and gold, what should the axial angle be?

A

4 degrees

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3
Q

For a prep for zirconia and gold, what should the axial depth be?

A

1 mm

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4
Q

For a prep for zirconia and gold, what should the occlusal/incisal depth be?

A

1.5-2mm

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5
Q

For a prep for zirconia and gold, what should the lingual depth be?

A

as little as 0.5

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6
Q

For a prep for zirconia and gold, how much depth is taken off functional cusp?

A

1.5 mm

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7
Q

For a prep for zirconia and gold, how much depth is taken off non-functional cusp?

A

1.0 mm

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8
Q

The scope of _____ includes: Restoration of a single tooth or rehabilitation of entire occlusion•Improve patient’s comfort and masticatory ability•Maintain health and integrity of dental arches•Elevate patient’s self-image by restoring dento-facial harmony

A

Fixed prosth

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9
Q

Which material used in fixed prosth is a crystalline structure that is 100% dense, has a tetragonal base, and extremely fine grain size that yields high strength?

A

Zirconia

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10
Q

What aids us in evaluation of tooth structure removal, and when complete, can help us make a provisional restoration

A

vacuum formed matrix

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11
Q

What size is the plastic sheet used to make the vacuum formed matrix

A

.020 mm

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12
Q

You want to cut down the vacuum matrix to which teeth?

A

One mesial to one distal of the tooth being worked on

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13
Q

Do you trim the vacuum matrix at the free gingival margin?

A

No

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14
Q

How far gingival do you want to trim the matrix?

A

5-6mm

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15
Q

What is used to make a putty matrix to evaluate the tooth structure reduction?

A

PVS

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16
Q

Where do you cut the PVS putty matrix?

A

In the center of the tooth being prepped

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17
Q

What kind of burs are used for crown preps?

A

Diamond

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18
Q

Which diamond bur is wider? 3.14.021 or 3.14.016

A

.021

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19
Q

What does the green stripe on diamond bur mean?

A

Course

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20
Q

What does the red stripe on diamond bur mean?

A

Fine

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21
Q

Where should a groove be placed on the crown prep?

A

Facial

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22
Q

____ form resists movement in the lateral direction

A

Resistance form

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23
Q

_____ form resists removal of the crown itself

A

Retention form

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24
Q

Prevents restoration removal along the path of insertion or the long axis of the tooth preparation.•Resists sticky foods.

A

Retention

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25
Q

Prevents restoration dislodgement by apical or oblique forces.•Occlusal forces.

A

Resistance

26
Q

The angle of convergence formed between 2 opposing prepared axial surfaces.

A

Total Occlusal Convergence (Taper)

27
Q

What is the ideal total occlusal convergence?

A

6-10 degrees

28
Q

What is the clinically acceptable total occlusal convergence?

A

10-20 degrees

29
Q

Does an increase in length increase or decrease resistance?

A

Increases resistance

30
Q

Does an decrease in length increase or decrease resistance?

A

Decreases resistance

31
Q

An increase in ____ produces a lock to resist lateral forces and movement

A

Height

32
Q

As the preparation ____ is increased the retention and resistance is increased.

A

length

33
Q

For every 1 mm increase in preparation length, the retention and resistance form increases up to ____.

A

10%

34
Q

The shorter the preparation, the ____ the taper must be.

A

lesser

35
Q

The longer the preparation, the ____ the taper maybe.

A

greater

36
Q

Is the arc or rotation larger for wider or narrower teeth?

A

Wider

37
Q

Do wider or narrower teeth need to be more parallel to resist lateral forces/movement?

A

Wider

38
Q

What is the minimum height that an incisor and premolar prep can be?

A

3 mm

39
Q

What is the minimum height a molar can be?

A

4 mm

40
Q

Thickness of partial veneer crowns (using high lucite porcelain) should have at least a thickness of _____ mm in stress bearing areas.

A

1.5-2.0 mm

41
Q

_____ is explained by: retention is increased by limiting the number of paths along which a restoration can be removed from tooth preparation

A

Freedom of Displacement

42
Q

Adding grooves limits the path of withdrawal to only 1 path which achieves _____ retention (greater or lesser)

A

Greater

43
Q

What bur should be used to do the occlusal reduction?

A

.016 diamond (1mm)

44
Q

At what angle should the .016 diamond bur be held to get the functional cusp bevel?

A

45 degree

45
Q

The ____ line is a line that goes around the tooth that is about 0.3-0.5 mm; easy to form, adequately distinct, adequate bulk for rigidity, adequate depth for normal contours in an all-metal crown

A

Chamfer Finish line

46
Q

To form the _____ , select a diamond that is 2x the desired depth (.3-.5mm) and place the rotating instrument into the tooth to 1/2 is diameter and move the instrument around tooth

A

Chamfer finish line

47
Q

Place the bur in the _____ to determine the proper path to perform the axial reduction

A

Center of occlusal plane

48
Q

What bur should you use for the axial reduction?

A

.021

49
Q

A slight _____ avoids abrading adjacent teeth on the proximal reductions

A

Over tapering

50
Q

Which bur should be used for the proximal reduction?

A

.016

51
Q

What bur should be used to smooth the corners of prep?

A

Red stripe football diamond

52
Q

____ is a principle of tooth prep that includes the chamfer line, more conservative so that less tooth is removed, shoulder line, modified shoulder; feather-knife edge

A

Marginal geometry

53
Q

Should porcelain or gold fill the crevice?

A

No

54
Q

____ is a marginal geometery principle that is used in metal ceramic margins and some all-ceramic crowns that is flat

A

Shoulder

55
Q

____ is a marginal geometry principle Used primarily for porcelain fused to metal crowns; flatten with a hand instrument

A

Modified Shoulder

56
Q

What is the marginal geometry principle that is contra-indicated? Causes overbulking

A

Feather/Knife edge

57
Q

_____ features include limiting the path of withdrawal and shortening the rotational radius

A

Secondary features

58
Q

_____ reduction like a functional cusp bevel provides Adequate occlusal/incisal clearance without excessive removal of tooth structure.•Anti-rotational effects for increased resistance. •Uniform restoration thickness.•Adequate room to reproduce physiologic contours and functional anatomy.•Adequate room for esthetics.

A

Morphologic reduction

59
Q

Direct evaluation of parallelism and path of draw is done with what instrument?

A

Handpiece

60
Q

Visual evaluation of parallelism and path of draw is done with what instrument?

A

Mouth mirror

61
Q

The article shows evidence that crowns with grooves in the ____ axial walls show the greatest resistance form?

A

Proximal walls

Occlusion (13 decks)

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