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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