Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
100 Cards in this Set
- Front
- Back
|
Which of these statements apply to the filler particles of composites?
a) microhybrid composites contain as much as 84% filler by weight b) fine-particle fillers range in size from 0.2-3 micrometers c) Microfilled composites contain more filler than all-purpose composites d) all-purpose composites contain more filler than flowable composites |
a, b, d
|
|
|
2. Which of the following statements about curing of composites are true?
a. Exposure times of 2 to 3 seconds are needed for polymerization with visible light. b. Before light activation, the base and catalyst pastes are mixed. c. Lights with both blue and red wavelengths are equally effective for polymerization. d. Light from an argon laser will activate polymerization. |
d
|
|
|
3. Which of the composites with the following fillers may be radiopaque?
a. Quartz b. Lithium aluminum silicate c. Colloidal silica d. Barium glass |
d
|
|
|
4. Which of the following polymer systems are used for the organic matrix in composites?
a. Bisphenol A–glycidyl methacrylate (Bis-GMA) b. Poly(methyl methacrylate) c. Urethane dimethacrylate (UDMA) d. Polystyrene |
a, c
|
|
|
5. Which of the following initiator-accelerator systems is needed for a light-activated composite?
a. Peroxide-amine b. Diketone-amine c. Organic acid–peroxide d. Organic acid–metal ion |
b
|
|
|
6. Which of the following properties are higher for microhybrid composites than for microfilled composites?
a. Polymerization shrinkage b. Thermal expansion c. Water sorption d. Modulus of elasticity |
d
|
|
|
7. Which of the following is the best choice of restorative material to achieve moderate to high strength, fluoride release, and esthetics?
a. Composite b. Compomer c. Hybrid ionomer d. Glass ionomer |
c
|
|
|
8. Which of the following statements about laboratory composites are true?
a. Curing using light, heat, and pressure increases the wear resistance. b. Bridges prepared from laboratory composites require a metal substructure. c. Fiber reinforcement increases their strength but decreases their rigidity. d. Restorations prepared from laboratory composites typically are cemented with zinc phosphate cement. |
a
|
|
|
9. Which of the following statements about adhesion of composite restorations to tooth structure are true?
a. Bonding is achieved to enamel by application of an acid etchant followed by application of a bonding agent and then the composite resin. b. The bonding agent forms a hybrid layer with enamel. c. The bonding agent forms a micromechanical bond with enamel but a chemical bond with dentin. d. Bonding agents with water as a solvent dry more readily after application to the prepared tooth than bonding agents with an acetone solvent. e. Most bonding agents bond more effectively to a dry tooth surface. |
a
|
|
|
10. Which of the following statements about compomers are true?
a. They are two-paste systems that self-cure within 2 to 3 minutes. b. Because of their resin content, they require a bonding agent for adhesion to tooth structure. c. They typically are recommended for Class II restorations. d. They also are known as polyacid-modified composites. |
b, d
|
|
|
11. Which of the following statements about provisional composites are true?
a. Provisional composites are more color stable than provisional acrylics. b. Provisional composites have less shrinkage on curing than provisional acrylics. c. Provisional composites are more wear resistant than provisional acrylics. d. Provisional composites release more heat on curing than provisional acrylics. |
b, c
|
|
|
12. Which of the following statements apply to the packable composites?
a. Their depth of cure allows bulk polymerization, which has been shown to be clinically effective. b. Their wear rate is low (3.5 m/year), which is similar to that of amalgam. c. They are radiolucent. d. They have similar or slightly less polymerization shrinkage than all-purpose composites. |
b, d
|
|
|
12. Which of the following statements apply to the packable composites?
a. Their depth of cure allows bulk polymerization, which has been shown to be clinically effective. b. Their wear rate is low (3.5 m/year), which is similar to that of amalgam. c. They are radiolucent. d. They have similar or slightly less polymerization shrinkage than all-purpose composites. |
b, c, d
|
|
|
14. Bonding agents with self-etching primers (sixth-generation) do not require _____ and _____.
|
etching with phospohoric acid, rinsing
|
|
|
15. New LED light-curing units are typically _____ and _____.
|
portable, rechargeable
|
|
|
16. Nanofilled composites generally will have lower surface roughness and higher gloss than microhybrid composites when polished by the same technique.
a. True b. False |
a
|
|
|
17. PAC light-curing units allow composites to be cured in a shorter time than typical QTH lights without adversely affecting properties.
a. True b. False |
b
|
|
|
1. Which of the following office conditions minimize the health hazard from spilled mercury?
a. Baseboard heating b. Floor carpeting c. Tile flooring without seams d. Amalgam scrap stored in a closed container (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
c, d
|
|
|
2. Which of the following represents the maximum safe concentration of mercury vapor in the breathing zone for a 40-hour workweek?
a. 0.05 ng Hg/m3 of air b. 30 ng Hg/m3 of air c. 100 ng Hg/m3 of air d. 0.05 mg Hg/m3 of air (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
d
|
|
|
3. For each of the following types of alloys, list which of the phases are present after amalgamation and complete reaction.
a. Spherical low-copper _____ b. Spherical high-copper _____ c. Admixed low-copper _____ d. Admixed high-copper _____ (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
3. a. Ag-Sn, Ag-Hg, Sn-Hg;
b. Ag-Sn-Cu, Ag-Hg, Cu-Sn; c. Ag-Sn, Ag-Hg, Sn-Hg; d. Ag-Sn-Cu, Ag-Hg, Cu-Sn (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
4. Once amalgamation has occurred, which of the following is true of mercury?
a. Is combined primarily with silver b. Has the toxic properties of unreacted mercury c. Can form at the surface of amalgam restorations if heated to 60° C (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a, c
|
|
|
5. For each of the following properties, list which of the phases has the lowest value for the following properties.
a. Corrosion resistance _____ b. Strength _____ c. Marginal fracture _____ (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
5. a. Sn-Hg;
b. Sn-Hg; c. Sn-Hg (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
6. For each property, list the amalgam type (irregular low-copper, admixed highcopper, and spherical high-copper) that has the highest value.
a. 1-hour compressive strength _____ b. Tensile strength _____ c. Creep _____ (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
6. a. spherical high-copper;
b. spherical high-copper; c. irregular low copper (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
6. For each property, list the amalgam type (irregular low-copper, admixed highcopper, and spherical high-copper) that has the highest value.
a. 1-hour compressive strength _____ b. Tensile strength _____ c. Creep _____ (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a, b, c, d
|
|
|
8. Which of these statements are correct in terms of preparing a correctly triturated mass of amalgam?
a. An undertriturated mass is crumbly and dull. b. A correctly triturated mass is smooth, homogeneous, and dull. c. An overmixed mass is removed readily from the capsule but is soupy in appearance. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
9. The objectives during condensation of amalgam are which of the following?
a. Adaptation to cavity walls, margins, and matrix b. Development of a compact mass free from voids c. No change in mercury concentration from that used in the mix (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a, b
|
|
|
10. Which of the following statements apply to condensation of amalgam?
a. Amalgam should be condensed in small increments with uniform force applied. b. A condenser is selected on the basis of its ability to remove excess mercury and to apply pressure needed for adaptation. c. Too large a condenser tip results in low condensation pressure and poor adaptation. d. A force of 3 to 4 kg on a condenser is satisfactory for adequate condensation of admixed and spherical alloys. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a, b, c, d
|
|
|
11. In the finishing of an amalgam restoration, which of the following is true?
a. Final finishing and polishing are done just after the amalgam hardens, regardless of the type of alloy. b. Burnishing over margins should not be done, since thin areas of amalgam susceptible to fracture can be formed. c. Polishing should be done in the presence of water. d. A correct finishing and polishing sequence would include finishing burs, green stone, silex, and tin oxide. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
b, c, d
|
|
|
12. Which statements are true for bonding of amalgam to tooth structure?
a. The most effective bonding agents contain copalite. b. Shear bond strength using amalgam bonding to teeth is clinically proven to be as high as that for bonding composites to teeth. c. The use of amalgam bonding restores the strength of the clinical crown to its original condition. d. The use of amalgam bonding reduces marginal leakage of amalgam restorations. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
d
|
|
|
13. Which type of amalgam (spherical vs. irregular) would you choose for a restoration that had to survive higher occlusal forces shortly after placement, and why?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
13. You would use a spherical high-copper amalgam because the setting reaction of the spherical amalgams is faster than irregular high-copper amalgams. This faster setting reaction is evident in the higher early strengths, when these amalgams set (see Table 5-2). The spherical amalgams have the added benefit that they can be polished at the placement appointment.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
14. Zinc originally was included in the amalgam alloy to facilitate cutting the amalgam into clean, irregular pieces. Why do most contemporary amalgams not include zinc?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
14. The presence of zinc in an amalgam will increase the risk of significant expansion of the amalgam if the amalgam is contaminated with moisture during condensation. This expansion can be dramatic and even fracture the tooth! Alloys for amalgam are considered zinc-free if they contain less than 0.01% zinc.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
15. Summarize the advantages of precapsulated amalgam.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
15. The use of precapsulated amalgam ensures that the appropriate mercury-alloy ratio will be used. The proper mercury-alloy ratio is important to the strength and corrosion properties of the amalgam. Precapsulated amalgam also ensures that the mercury will remain clean. Mercury is contaminated easily from dust and dirt in the air and dirty mercury will not react as well with the silver alloy. Finally, precapsulated amalgam lowers the risk of mercury vapor being released into the office because the mercury is not exposed to office air until after the amalgam is mixed, and no risk exists of spilling a large amount of mercury in the operatory.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
16. You examine set amalgam under an electron microscope and observe that all the original -particles have reacted. What will you predict about the physical properties of this amalgam? Why?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
16. The amalgam will be weaker in compressive and tensile strength because the gamma phase is the strongest of the phases. Because all of the gamma phase reacted in this amalgam, the amalgam will be weaker. The amalgam will also likely have more intraoral corrosion because the gamma phase has the least corrosion of the phases. Finally, the amalgam should have more expansion than normal during setting because of the formation of more of the gamma-1 and eta phases than normal.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
17. You see an old amalgam in a patient's mouth. It is dark and needs polishing. How can you determine if the amalgam has corroded or is just tarnished? If the amalgam has corroded, what is the remedy for this restoration?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
17. If the luster and surface of the amalgam are restored by polishing, then the amalgam was tarnished. However, if polishing fails to restore the amalgam to its original condition, then corrosion has occurred. Polishing is a surface treatment and tarnish is a surface phenomenon. Thus polishing cannot correct corrosion, which is a subsurface phenomenon. If corrosion has occurred, then the only clinical solution is to replace the restoration.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
18. You are triturating an amalgam in a precapsulated form. The timer on the amalgamator breaks and you do not know if the amalgam was over or under triturated. How will you tell? How do you explain what you see in terms of the amalgamation reaction? Which condition would you rather use clinically?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
18. If the amalgam has a soupy, shiny appearance and tends to stick to the capsule, then it has been overtriturated. This appearance is caused by over formation of gamma-1 and eta and excessive loss of the original gamma phase. If the amalgam is crumbly and dry, then it has be undertriturated. This appearance is caused by a lack of enough gamma-1 and eta to hold the original gamma particles together. In either case, the properties of the amalgam will be inferior, so neither condition should be used.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
19. One goal of amalgam condensation is to remove excess mercury from the amalgam. Why is this desirable?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
19. Excess mercury leads to a weaker restoration with higher risk for release of mercury vapor.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
20. Give the definition of creep and explain why creep is an important property in a clinical situation.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
20. Creep is the gradual deformation of the amalgam under a load. In the mouth, creep is important because amalgams are subjected to stress from occlusion. Creep ultimately will cause a fracture at the margins of the restorations and require replacement of the restoration.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
21. A patient arrives at your office and expresses concern about mercury from dental amalgam causing her harm. What will you tell this patient to reassure her about the safety of amalgam?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
21. Three points: (1) The mercury that is in an amalgam is not free to be released into the body but is tied up chemically in the amalgam matrix. The vast majority of this mercury never leaves the amalgam. (2) Very small amounts (1 to 2 g/day) are released as a vapor from the amalgam, but no evidence suggests this release poses any health risk. Our exposure to mercury through the air, water, and food (especially some seafood) is far greater than through amalgams. (3) Amalgam has been used as a restorative material for nearly 100 years with no apparent adverse health effects.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
22. What special precautions should be taken to limit the exposure of the dental team and the patient to mercury during the removal of an amalgam?
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
22. Use high volume evacuation and water coolant with the high-speed handpiece. Both of these steps will reduce the amount of heat generated and the amount of mercury released and also will tend to remove mercury vapor, which is released during the removal.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.5). <vbk:0-323-02520-X#outline(16.1.0.5)> |
|
|
23. Which one of the following phases in dental amalgam restoration is most prone to electrochemical corrosion?
a. Ag-Sn b. Cu-Sn c. Sn-Hg d. Ag-Hg (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
c
|
|
|
24. Which one of the following phases in dental amalgam restoration has the best mechanical properties?
a. Ag-Sn b. Cu-Sn c. Sn-Hg d. Ag-Hg (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
25. Which one of the following mixing methods permits the escape of dental amalgam mercury vapor?
a. Mixing in a mortar and pestle b. Proportioning mercury and alloy into a friction-fit capsule c. Triturating precapsulated alloy and mercury d. A cover over the mixing arms on a triturator e. All of the above (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
26. Which one of the following is not true about high-copper dental amalgam restorations?
a. Better corrosion resistance than low-copper dental amalgams b. Contain both Sn and Ag in the composition as well c. Produce excessive creep d. Restorations are more brittle than low-copper versions (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
c
|
|
|
27. Which one of the following is not a criterion for a failed high-copper dental amalgam restoration?
a. Marginal ditching along occlusal margins b. Creep of the restoration out of the cavity preparation in proximal areas c. Wear facets along the occlusal contact areas d. None of the above (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
c
|
|
|
28. Dental personnel can do which one of the following to limit their exposure to mercury?
a. Sterilize amalgam scrap b. Vacuum up a spill immediately c. Avoid touching freshly mixed amalgam d. Avoid polishing amalgams (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
c
|
|
|
29. The primary difference between low- and high-copper amalgams is which of the following?
a. The amount of copper b. The amount of copper and zinc c. The amount of copper and tin d. The amount of copper and silver (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
30. The primary difference in the reaction products of low- and high-copper amalgam is which of the following?
a. Low-copper amalgam has 2, high-copper amalgam has no 2 b. Low-copper amalgam has higher 1 c. High-copper amalgam has a copper-tin phase, low-copper amalgam does not d. Both a and c (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
d
|
|
|
31. Ideally, the set amalgam should do which of the following?
a. Expand greatly to provide marginal seal against the tooth b. Shrink significantly to provide space for corrosion products to seal the margins c. Have little dimensional change d. None of the above (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
c
|
|
|
32. The physical properties most desirable in set amalgam are which of the following?
a. High strength, low creep, low corrosion b. Low strength, low creep, low corrosion c. High strength, high creep, low corrosion d. High strength, high creep, high corrosion (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
33. Higher mercury left in an amalgam leads to which of the following?
a. Higher creep b. Higher strength c. Lower corrosion d. All of the above (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
34. Which of the following occurs when dental amalgam is overmixed?
a. Compressive strength decreases b. Corrosion decreases c. Tensile strength increases d. Both a and b e. Both a and c (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 5.10). <vbk:0-323-02520-X#outline(5.10)> |
a
|
|
|
1. A small portion of an anterior tooth would most likely be restored with which of the following?
a. Amalgam b. Composite resin c. Gold alloy d. Porcelain (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b
|
|
|
2. The restorative material used to restore a small portion of an anterior tooth should have which of the following properties?
a. Esthetics b. High strength c. Durability d. Ease of casting (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,c
|
|
|
3. A portion of a posterior tooth that is subject to high biting forces would likely be restored with which of the following?
a. Amalgam b. Composite resin c. Gold inlay d. Acrylic resin (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,c
|
|
|
4. A direct restorative material used frequently to restore a portion of a posterior tooth that is subject to large biting forces would possess which of the following properties?
a. Esthetics b. High strength c. Ease of casting d. Thermal insulation (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b
|
|
|
4. A direct restorative material used frequently to restore a portion of a posterior tooth that is subject to large biting forces would possess which of the following properties?
a. Esthetics b. High strength c. Ease of casting d. Thermal insulation (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,d
|
|
|
6. An anterior fixed partial denture could have facings constructed of which of the following materials?
a. Composite resin b. Acrylic resin c. Ceramic d. Gold alloy (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,b,c
|
|
|
7. Which of the following sentences describes the construction of removable partial dentures?
a. They are attached to natural teeth with cements. b. They are removable and attached to teeth with clasps. c. Nickel, cobalt, and chromium alloys are used for the framework. d. Artificial acrylic teeth are attached. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b,c,d
|
|
|
8. Full denture bases are usually made from which of the following materials?
a. Composite restorative resins b. Gold alloys c. Acrylic resins d. Ceramic (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
c
|
|
|
9. Which of the following metals currently are used in dental alloys?
a. Gold b. Mercury c. Cobalt and chromium d. Nickel (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,b,c,d
|
|
|
10. Acrylic resins are used in which of the following?
a. Posterior inlays b. Denture bases c. Artificial teeth d. Ceramic (porcelain)-fused-to-metal crowns (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b,c
|
|
|
11. Which of the following materials are used for dental implants?
a. Gold alloys b. Cobalt and chromium alloys c. Titanium d. Ti6AI4V (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
c,d
|
|
|
12. A posterior restoration that involves the occlusal surfaces, two proximal surfaces, and all cusps is called an_____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
MOD
|
|
|
1. A small portion of an anterior tooth would most likely be restored with which of the following?
a. Amalgam b. Composite resin c. Gold alloy d. Porcelain (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b
|
|
|
2. The restorative material used to restore a small portion of an anterior tooth should have which of the following properties?
a. Esthetics b. High strength c. Durability d. Ease of casting (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,c
|
|
|
3. A portion of a posterior tooth that is subject to high biting forces would likely be restored with which of the following?
a. Amalgam b. Composite resin c. Gold inlay d. Acrylic resin (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,c
|
|
|
4. A direct restorative material used frequently to restore a portion of a posterior tooth that is subject to large biting forces would possess which of the following properties?
a. Esthetics b. High strength c. Ease of casting d. Thermal insulation (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b
|
|
|
4. A direct restorative material used frequently to restore a portion of a posterior tooth that is subject to large biting forces would possess which of the following properties?
a. Esthetics b. High strength c. Ease of casting d. Thermal insulation (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,d
|
|
|
6. An anterior fixed partial denture could have facings constructed of which of the following materials?
a. Composite resin b. Acrylic resin c. Ceramic d. Gold alloy (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,b,c
|
|
|
7. Which of the following sentences describes the construction of removable partial dentures?
a. They are attached to natural teeth with cements. b. They are removable and attached to teeth with clasps. c. Nickel, cobalt, and chromium alloys are used for the framework. d. Artificial acrylic teeth are attached. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b,c,d
|
|
|
8. Full denture bases are usually made from which of the following materials?
a. Composite restorative resins b. Gold alloys c. Acrylic resins d. Ceramic (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
c
|
|
|
9. Which of the following metals currently are used in dental alloys?
a. Gold b. Mercury c. Cobalt and chromium d. Nickel (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
a,b,c,d
|
|
|
10. Acrylic resins are used in which of the following?
a. Posterior inlays b. Denture bases c. Artificial teeth d. Ceramic (porcelain)-fused-to-metal crowns (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
b,c
|
|
|
11. Which of the following materials are used for dental implants?
a. Gold alloys b. Cobalt and chromium alloys c. Titanium d. Ti6AI4V (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
c,d
|
|
|
12. A posterior restoration that involves the occlusal surfaces, two proximal surfaces, and all cusps is called an_____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
MOD
|
|
|
13. An area in a deep restoration between the tooth and the restorative material used to insulate the pulp is called the _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
base
|
|
|
13. An area in a deep restoration between the tooth and the restorative material used to insulate the pulp is called the _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
base
|
|
|
14. A restoration that covers the entire coronal portion of the tooth is called a _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
crown
|
|
|
15. After a root canal procedure the canal is frequently filled using _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
gutta-percha
|
|
|
14. A restoration that covers the entire coronal portion of the tooth is called a _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
crown
|
|
|
15. After a root canal procedure the canal is frequently filled using _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
gutta-percha
|
|
|
16. A restoration that replaces a missing tooth that is supported by and cemented to two adjacent teeth is called a _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
fixed partial denture
|
|
|
17. A restoration where artificial teeth are mounted on a metal framework containing clasps that attach it to remaining abutment teeth is called a _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
removable partial denture
|
|
|
18. A restoration that replaces all the teeth in the upper or lower arch with artificial teeth that are attached to a plastic base is called a _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
full or complete denture
|
|
|
19. A restoration that replaces the root of an extracted tooth and is stabilized by bone growth around it is called an _____.
(Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 1.2). <vbk:0-323-02520-X#outline(1.2)> |
implant
|
|
|
1. Which of the following statements describe the purpose of the American National Standards Institute and the American Dental Association specifications?
a. The specifications measure clinical properties of materials to establish minimum standards. b. The specifications measure critical physical and mechanical properties of materials to establish minimum standards. c. Lists of certified materials ensure clinical success. d. Lists of certified materials ensure quality control and are helpful in the selection of materials for dental practice. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
b, d
|
|
|
2. An impression of the vertical dimension of a cavity preparation 8 mm in length shows a linear contraction of 0.5%. Compute the actual dimensional change in micrometers (m).
a. 4 m b. 40 m c. + 40 m d. + 0.04 m (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
b
|
|
|
3. A pattern 8 mm in length made from a wax with a linear coefficient of thermal expansion of 380 x 106/°C cools from 37° to 22°C. Compute the actual dimensional change in micrometers (m).
a. 45.6 m b. 0.0456 m c. 4.56 m d. +4.56 m (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a
|
|
|
4. Rank the following dental materials in order of increasing values of their coefficient of thermal expansion: dental amalgam, human teeth, porcelain, and unfilled acrylic plastics.
a. Human teeth, porcelain, dental amalgam, and unfilled acrylic plastics b. Porcelain, human teeth, unfilled acrylic plastics, and dental amalgam c. Porcelain, human teeth, dental amalgam, and unfilled acrylic plastics d. Human teeth, porcelain, unfilled acrylic plastics, and dental amalgam (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
c
|
|
|
5. Which of the following statements describe percolation?
a. Percolation usually decreases with time after insertion of dental amalgam. b. Percolation is caused by differences in the coefficient of thermal expansion between the tooth and the restorative material when heated or cooled. c. Percolation is thought to be undesirable because of possible irritation to the dental pulp and recurrent decay. d. Percolation is not likely to occur with unfilled acrylic restorations. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a, b, c
|
|
|
6. Which of the following restorative materials have values of thermal conductivity similar to human enamel and dentin?
a. Dental amalgam b. Composites c. Zinc phosphate cements d. Gold alloys (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
b, c
|
|
|
6. Which of the following restorative materials have values of thermal conductivity similar to human enamel and dentin?
a. Dental amalgam b. Composites c. Zinc phosphate cements d. Gold alloys (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a, c, d
|
|
|
8. Which of the following conditions could lead to corrosion in restorative dentistry?
a. A gold alloy contaminated with iron during handling in the dental laboratory b. A chemical attack of a metal by components in food or saliva c. Polished amalgams that have become dull and discolored with time d. Adjacent restorations constructed of dissimilar metals (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a, b, c, d
|
|
|
9. The contact angle of water on a dental wax is 105 degrees. Which of the following terms describe the wettability of the wax?
a. Hydrophobic b. Hydrophilic c. Hydroscopic d. Hygroscopic (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a
|
|
|
10. Which of the following factors increase the wetting of a solid by a liquid?
a. High surface energy of the solid b. Low surface energy of the liquid (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a, b
|
|
|
11. Which of the following statements are true?
a. The average biting force on an incisor is about 180 N. b. The average biting force on a first molar is about 1110 N. c. The average biting force on complete dentures is about 111 N. d. When a first molar is replaced by a fixed bridge, the biting force on the restored side is about 220 N. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a, c, d
|
|
|
12. An amalgam has a force of 111 N applied over a contact area of 0.645 mm2, which of the following is the stress applied to the amalgam? Would you expect the amalgam to fracture?
a. 17.2 MPa b. 1720 MPa c. 172 MPa d. 1.72 MPa (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
c
Note the compressive strengths of amalgams are from 310 to 483 MPa. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 16.1.0.2). <vbk:0-323-02520-X#outline(16.1.0.2)> |
|
|
13. An alginate impression can withstand a strain of 10% without significant permanent deformation. If the impression must be deformed 0.5 mm to pass over an undercut, how thick should the material be between the tray and the tooth?
a. 10 mm b. 5 mm c. 0.5 mm d. 0.05 mm (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
b
|
|
|
14. Which of the following dental materials have an elastic modulus value that is similar to human enamel?
a. Zinc phosphate cement b. Human dentin c. Dental amalgam d. Gold alloy (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
d
|
|
|
15. Which of the following statements are true?
a. The yield strength is always slightly higher than the proportional limit. b. Above the stress associated with the yield strength, a material no longer functions as an elastic solid. c. Above the stress associated with the yield strength, a material will be permanently deformed, even after the applied force is removed. d. Most restorations are not classified as clinical failures until fracture has occurred. (Powers, John M.. Dental Materials: Properties and Manipulation, 8th Edition. C.V. Mosby, 2003. 2.9). <vbk:0-323-02520-X#outline(2.9)> |
a, b, c
|
