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Dental Materials > Second Exam Samplex > Flashcards

Second Exam Samplex Flashcards

1
Q 
A cement that is able to initiate dentin formation.
A.	zinc phosphate cement
B.	zinc oxide cement
C.	polycarboxylate cement
D.	calcium hydroxide
E.	silicate cement
A

X

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2
Q 
Dental cement that has an exothermic reaction.
A.	zinc phosphate cement
B.	zinc oxide cement
C.	polycarboxylate cement
D.	GIC
E.	Calcium hydroxide cement
A

X

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3
Q 
Dental cement that is mixed from big to small increments.
A.	zinc phosphate cement
B.	zinc oxide cement
C.	polycarboxylate cement
D.	GIC 
E.	calcium hydroxide cement
A

X

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4
Q

Process of ceramic strengthening; crystalline materials capable of undergoing changes in its crystalline structure under stress.

A

transformation toughening

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5
Q 
Dental cement that is insoluble to oral fluids
A.	zinc phosphate
B.	zinc oxide
C.	polycarboxylate
D.	glass ionomer
E.	calcium hydroxide
F.	none of the above
A

F. none of the above

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6
Q 
Which type of fluoride is contraindicated for use on porcelains?
A.	0-4% Stannous F
B.	1.5% Stannous F
C.	2% NaF
D.	1.2%  Acidulated phosphate F
E.	4% NaF
A

A. 0-4% Stannous F

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7
Q 
The process of coalescing or fusing the mineral components of porcelain together ath high temperature without the materials completely melting is termed
A.	fritting
B.	condensing
C.	sintering
D.	firing
E.	quenching
A

C. sintering

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8
Q 
Process in the construction of a ceramic crown wherein the porcelain is \_\_\_\_\_\_ to the derived form 
A.	condensation
B.	firing
C.	glazing
D.	cooling
A

B

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9
Q

Ceramic pontics for complete dentures are constructed from what type of porcelain?

A

high fusing and medium fusing

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10
Q 
Zinc oxide powder + polyacrylic acid is:
A.	ZOE cement
B.	Zinc phosphate cement
C.	Zinc silicophosphate cement
D.	Polycarboxylate cement
E.	GIC
A

A. ZOE cement

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11
Q

Type of ceramic strengthening whereby rapid cooling of the glass is employed

A

Thermal tempering

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12
Q

Complete meaning for the acronym CAD-CAM

A

Computer Aided Designing – Computer Aided Machining

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13
Q

Cement that is an effective chemical barrier

A

Calcium Hydroxide

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14
Q

Process where calcium hydroxide is place over a very thin layer of dentin as a pulpal protection

A

Cavity Lining

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15
Q

Cement that can form both a chemical and mechanical bond to dentin

A

Polycarboxylate cement

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16
Q

The wavelength necessary to cure a light-cured composite

A

400-500 nm

17
Q 
A typical degree of conversion of bis-GMA based composite
A.	30-50
B.	50-70
C.	70-90
D.	90-100
A

B. 50-70

18
Q

Use of high intensity curing lights result in the following except
A. increased values of mechanical properties
B. increased polymerization shrinkage
C. increased wear resistance
D. improved clinical performance

A

D. improved clinical performance

19
Q

A curing light less than this requires the operator to increase the curing times to more than 40sec/increment
A. increase curing time
B. place thinner increments
C. keep curing tip very close to composite material
D. use lighter shade of composite

A

A. increase curing time

20
Q

The smoothest surface of a composite restoration is produced by
A. celluloid strip
B. diamond finishing points
C. fluted carbide finishing burs
D. silicone polishers and diamond polishing paste

A

A. celluloid strip

21
Q

Composites are made radiopaque
A. to make visualizations of marginal gaps easier
B. because commonly used fillers are radiopaque
C. for easier differentiation of composite from caries
D. because dentin is radiolucent

A

C. for easier differentiation of composite from caries

22
Q

Is lack of radiopacity a common clinical problem for posterior teeth?

A

No

23
Q

Conditioning of dentin is now an acceptable practice mainly because

A

hydrophilic resins like HEMA I are developed and used successfully

24
Q

Will drying of conditioned dentin lead to increased bond strength of composite to dentin?

A

No.

25
Q

bond between filler and organic matrix

A

coupling agent

26
Q

acts as stress absorber

A

x

27
Q 
GICs are also referred to as
A.	glass polyacrylic acid cement
B.	glass polyalkenoate cement
C.	calcium flurosilicate cement
D.	fluoroaluminum cement
A

B. glass polyalkenoate cement

28
Q 
Composition of powder GICs
A.	MgO2 & ZnO2
B.	Fluoroaluminosilicate & ZnO2
C.	Stannic oxide, aluminum & barium oxide
D.	Polycarboxylate & strontium oxide
A

B. Fluoroaluminosilicate & ZnO2

29
Q 
The tartaric acid present in the liquid of GICs impares the following except
A.	Increased working time
B.	Shortened setting time
C.	Improved handling characteristics
D.	Two of the above
E.	None of the above
F.	All
A

E. None of the above

30
Q

The need for retention in a cavity preparation is reduced when using GIC because

A

the tensile strength of GIC is close to dentin

31
Q

Is susceptibility to fracture a shortcoming of GIC?

A

No

32
Q

Resin composite added to liquid with conventional GIC in RMGICs

A

HEMA

33
Q

RMGICs exhibit greater microleakage than conventional GIC because of

A

greater degree of shrinkage on setting

34
Q

Can RMGIC be used for restoration of class II cavity preparation?

A

No.

Dental Materials (3 decks)

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