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Fixed Prosth 1 > Metal Ceramic Restorations > Flashcards

Metal Ceramic Restorations Flashcards

1
Q
  • A metal casting (coping) which fits over the prepared tooth with ceramic fused to it.
  • Combines the strength and accuracy of cast metal with esthetics of porcelain.
A

Metal-Ceramic Restorations

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2
Q 
Indications for \_\_\_\_\_ restorations:
•Need for full coverage with esthetic demands:
•Extensive tooth destruction
•Large restorations / undermined enamel
•Opposing ceramic surfaces
A

Metal-Ceramic Restorations

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3
Q

Advantages of ______ restorations:
•Natural appearance -esthetics
•Retention and resistance qualities of full crown
•More resistant to fracture than all-ceramic / dependable fabrication of FPD
•Greater strength w/ less reduction than all-ceramic
•Ability to have metal occluding surfaces
•Preparation is less demanding than Partial Veneer Crown

A

Metal-Ceramic Restorations

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4
Q

The key tooth prep form decision is the ____

A

Finish line

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5
Q

What 3 finish lines can be used in metal ceramic restoration?

A

Shoulder
Shoulder w bevel
Chamfer

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6
Q

_____ finish line
•Some people think it makes for a better fitting crown
•It is certainly acceptable to use such a finish line but it does not make the crown fit better and it does not work with a porcelain margin
-Must be all in metal

A

Shoulder finish line w bevel

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7
Q

______ finish lines provide greater cervical space for an esthetic thickness of porcelain without over contouring the crown and can be used with porcelain margins

A

Shoulder

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8
Q

______ finish line:
Need for optimal porcelain thickness near the margin for esthetics and particularly when optimal reduction is not possible

A

Shoulder finish line

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9
Q

_______ finish line:
•Easier to prepare than a sharp angle
•Required for any crown that will be milled
•Produces less tooth weakening than sharp axiogingival line angles for small teeth or RCT, teeth that will be subjected to greater force since they are FPD abutments, and teeth with substantial secondary dentin where there is very little pulp space remaining (older patients)

A

Shoulder with rounded angles

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10
Q

_____ finish line:
–ease of fabrication for non-esthetic situations
•Metal thinned to a fine line that is barely visible –improved esthetics compared to metal collar but more opacity than porcelain margin
- Must be placed subgingivally and not used for esthetic cases

A

Metal collar

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11
Q

All of the margin designs have a chamfer on the ____ portion of the prep to accomodate a metal margin

A

Lingual

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12
Q

What are the 3 margin designs for metal ceramic designs?

A

Metal Collar
Porcelain Shoulder
Disappearing Margin

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13
Q

_____ finish line with ____ margin
•Enhanced cervical esthetics
•When there is gingival inflammation due to overcontoured crowns and you want to make slightly undercontoured crowns to improve the gingival response

A

Shoulder finish line with Ceramic Margin

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14
Q 
The following are reasons for extending margins \_\_\_\_\_\_
•Existing caries
•Extensions of previous restorations
•Subgingival tooth fracture
•Root sensitivity
•Retention/ Resistance
•Esthetics
A

Subgingivally

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15
Q

The subgingivally placed finish line should not extend more than ____ into sulcus

A

1/2 way into sulcus

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16
Q

:the part of the axial contour that extends from the base of the gingival sulcus past the free margin to the height of contour.
•Straight or slightly concave; not bulky or excessively convex

A

Emergence Profile

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17
Q

-______ is subject to brittle fracture if there is internal stresses and excessive thickness

A

Porcelain/Ceramics

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18
Q

_____ abrasiveness –wear to opposing enamel / metal

•Hardness and microscopic roughness

A

Porcelain

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19
Q

If a porcelain crown is polished to a glaze, how will this affect abrasiveness to opposing dentition?

A

More abrasiveness

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20
Q

_______
•Advantages:•Esthetics
•Disadvantages:•Increased removal of tooth structure

A

Porcelain

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21
Q

______ angle of margin / obtuse finish line → decreased marginal gap.-Bevel -(Only if infinitely closable)

A

Acute

22
Q

The ________ of the cement can prevent complete seating of a casting with near parallel bevels

A

film thickness

23
Q

Margin angles of less than ______ may produce a metal margin that is too thin and weak.

A

25o

24
Q

What is the angle of margins that is best for cavosurface margins?

A

35-55

25
Q

______ margins are difficult to evaluate

A

Subgingival

26
Q
  • The combined connective tissue-epithelial attachment from the alveolar crest to base of the gingival sulcus (approximately 2 mm).
  • (+ 1 mm for a healthy gingival sulcus= 3mm free gingival margin to alveolar crest.)
A

Biologic width

27
Q

In an anterior metal ceramic prep, the F-L taper is necessary for ______ form

A

Resistance

28
Q

In an anterior metal ceramic prep, the M-D surfaces provide ______ form

A

Retention

29
Q

What is the ideal taper for an anterior metal ceramic prep?

A

10 degrees

30
Q

What is the ideal linguogingival height for an anterior metal ceramic prep?

A

1.5 mm

31
Q

How many mm thick should the metal coping be for veneered areas in a metal ceramic restorations?

A

.3-.5mm

32
Q

How many mm thick should the metal coping be for non-veneered areas in a metal ceramic restorations?

A

0.8-1mm

33
Q

How many mm thick should the opaque porcelain be in a metal ceramic restorations?

A

.1-.2mm

34
Q

How many mm thick should the shoulder porcelain be in a metal ceramic restorations?

A

.8mm

35
Q

How many mm thick should the gingival, body, and incisal porcelain be in a metal ceramic restorations?

A

.8-1.5/2mm

36
Q

Should the facial reduction on an anterior metal ceramic prep be in one plane or 2 planes?
-Allows adequate reduction for uniform color / contours and resistance.

A

2 planes

37
Q

_______ reduction of facial surfaces of an anterior prep→ bulky contour or opaque “bright spot”

A

Inadequate

38
Q

_______ reduction of facial surfaces of an anterior prep-decreased resistance / pulpal insult.

A

Over-reduction

39
Q

______ reduction results in light reflection from the opaque porcelain

A

Inadequate

40
Q

•Pulpal “blush” / pulpal exposure•Axial reduction → approaches pulp quickly•1.2 –1.5mm at cervical is often too much•Amount removed ↑ with ↑ TOC preparation•↑TOC = ↓Resistance form

A

Overreduction

41
Q

_____ proximal reduction facilitates the development of normal appearing proximal color and translucency

A

Uniform

42
Q

_______ of preparation→ metal in proximal → blocks light transmission

A

Proximal wing

43
Q

In an anterior metal ceramic prep, Extension of facial shoulder reduction slightly greater than ____mm ______ (which way) to contact; gradual blend to lingual

A

1mm lingual to contact

44
Q

How deep should a porcelain shoulder be on an anterior metal ceramic crown?

A

1.2 mm

45
Q

How wide should a metal collar be?

A

.3-.5mm

46
Q

Should a metal collar be supra or subgingival usually?

A

Subgingival

47
Q

reasons to use a _______
•Ease of fabrication
•Include thin, unsupported tooth structure
•Extend margin apically with less tooth reduction

A

Metal collar

48
Q

For the posterior occlusal metal ceramic crown, how thick should porcelain be?

A

1.5mm

49
Q

For the posterior occlusal metal ceramic crown, how thick should metal be?

A

.5mm

50
Q 
\_\_\_\_\_\_\_\_\_ occlusion
•less tooth reduction
•less opposing tooth wear
•stronger restoration
•1.5mm occlusal reduction
Esthetic Requirements
Extent of Porcelain Coverage
A

Metal Occlusion

51
Q 
\_\_\_\_\_\_ occlusion
•Esthetic zone
•Generally NOT 2nd Molars
•Opposing ceramic surfaces
•2.0mm occlusal reduction
A

Porcelain Occlusion

Fixed Prosth 1 (12 decks)

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