Test Bank For Dental Materials Foundations And Applications 11th Edition By Powers

Description

Test Bank For Dental Materials Foundations And Applications 11th Edition By Powers

Chapter 05: Dental Amalgam

Powers: Dental Materials, 11th Edition

MULTIPLE CHOICE

1. Which component of dental amalgam exists as a liquid in the capsule before trituration?

a.	Tin
b.	Silver
c.	Copper
d.	Mercury

ANS: D

	Feedback
A	Tin metals are solid powders.
B	Silver metals are solid powders.
C	Copper metals are solid powders.
D	Mercury is the sole liquid in the capsule.

DIF: Knowledge REF: p.  59OBJ:3

TOP:CDA, GC, III Chairside Dental Materials (Preparation, Manipulation, and Application) B, 1, Describe how to prepare, mix, deliver, and store restorative materials, including but not limited to a. amalgam

MSC: NMDHE, 6.0 Providing Supportive Treatment Services, 6.1 Properties and manipulation of materials

2. A freshly mixed mass of amalgam has a puttylike consistency for _____ minutes.

a.	1 to 2
b.	4 to 5
c.	9 to 10
d.	15

ANS: A

	Feedback
A	A freshly mixed mass of amalgam has a puttylike consistency for 1 to 2 minutes. The amalgam must be manipulated into the cavity preparation during this time. The amalgam progresses to a carvable consistency for an additional 2 to 4 minutes.
B	This time is beyond the reaction limits, and carving after that point could result in fracture.
C	This time is beyond the reaction limits, and carving after that point could result in fracture.
D	This time is beyond the reaction limits, and carving after that point could result in fracture.

DIF: Knowledge REF: p.  58OBJ:1

TOP:CDA, GC, III Chairside Dental Materials (Preparation, Manipulation, and Application) B, 1, Describe how to prepare, mix, deliver, and store restorative materials, including but not limited to a. amalgam

MSC: NMDHE, 6.0 Providing Supportive Treatment Services, 6.1 Properties and manipulation of materials

3. Which of the following is not an advantage of dental amalgam when contrasted with direct resin composite?

a.	Longevity
b.	Superior esthetics
c.	Marginal integrity in subgingival areas
d.	Ease of placement in diverse clinical situations

ANS: B

	Feedback
A	Longevity decreases when using an esthetic material.
B	Alternate restorative materials such as direct composite suffer from clinical problems such as expense, shorter longevity, and technique sensitivity. However, amalgams are not considered esthetic materials.
C	Marginal integrity decreases when using an esthetic material.
D	Ease of placement decreases when using an esthetic material.

DIF: Knowledge REF: p.  58OBJ:4

TOP:CDA, GC, III Chairside Dental Materials (Preparation, Manipulation, and Application) B, 1, Describe how to prepare, mix, deliver, and store restorative materials, including but not limited to a. amalgam

MSC: NMDHE, 6.0 Providing Supportive Treatment Services, 6.1 Properties and manipulation of materials

4. High-copper amalgam has about _____ wt % copper.

a.	3
b.	5 to 10
c.	13 to 30
d.	30 to 40
e.	40 to 50

ANS: C

	Feedback
A	Low-copper amalgams have a copper content less than 13 wt % and are rarely used today.
B	Low-copper amalgams have a copper content less than 13 wt % and are rarely used today.
C	High-copper amalgam has about 13 to 30 wt % copper.
D	This percentage is far beyond the set parameters for copper content in amalgam.
E	This percentage is far beyond the set parameters for copper content in amalgam.

DIF: Knowledge REF: p.  58OBJ:2

TOP:CDA, GC, III Chairside Dental Materials (Preparation, Manipulation, and Application) B, 1, Describe how to prepare, mix, deliver, and store restorative materials, including but not limited to a. amalgam

MSC: NMDHE, 6.0 Providing Supportive Treatment Services, 6.1 Properties and manipulation of materials

5. High-copper amalgams have __________________ than low-copper amalgams.

a.	more corrosion
b.	higher strength
c.	better longevity
d.	A and C are correct.
e.	B and C are correct.

ANS: E

	Feedback
A	High-copper amalgams have higher strength, less corrosion, and better longevity than low-copper amalgams.
B	B and C are correct.
C	B and C are correct.
D	High-copper amalgams have higher strength, less corrosion, and better longevity than low-copper amalgams.
E	B and C are correct.

DIF: Comprehension REF: p.  58 OBJ: 2

TOP:CDA, GC, III Chairside Dental Materials (Preparation, Manipulation, and Application) B, 1, Describe how to prepare, mix, deliver, and store restorative materials, including but not limited to a. amalgam

MSC: NMDHE, 6.0 Providing Supportive Treatment Services, 6.1 Properties and manipulation of materials

6. Which component of earlier low-copper amalgam caused a significant, unacceptable expansion of amalgam when it was contaminated with moisture during placement?

a.	Mercury
b.	Copper
c.	Silver
d.	Zinc
e.	Tin

ANS: E

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