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28 Cards in this Set
- Front
- Back
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From the following list, select the three materials that are considered rigid dental impression materials:
a. Alginate b. Agar hydrocolloid c. Impression plaster d. ZOE e. Impression compound |
c. Impression plaster d. ZOE e. Impression compound |
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Model plaster, dental stone, and high strength dental stone all have the same crystal size and porosity. These three materials are all made out of the same chemical, calcium sulfate hemihydrate.
a. both are true b. both are false c. first is true, second is false d. first is false, second is true |
c. First is true, second is false |
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Select the three properties that are associated with agar from the following list:
a. flexible b. irreversible c. dimensionally stable d. extracted from seaweed e. complex manipulation |
A. flexible d. extracted from seaweed e. complex manipulation |
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The wettability of solids by liquids is important in dentistry. A material that is hydrophilic shows a contact angle of 90º or greater.
a. both true b. both false c. first true, second false d. first false, second true |
c. first true, second false |
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Which of the following restorative dental materials has the lowest compressive strength?
a. Porcelain b. Glass ionomer c. Dental amalgam d. Hybrid composites |
b. glass ionomer |
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Which of the following dental cements inhibits the polymerization of a composite restorative material and should not be placed under the restoration?
a. Zinc phosphate b. Calcium hydroxide c. Polycarboxylate d. ZOE |
d. ZOE |
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A patient presents with horizontal incisal wear on the anterior teeth. Which of the following most likely caused it?
a. shear stress b. tensile stress c. reached proportional limit d. lack of compressive strength |
a. shear stress |
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Select the two materials that will act as retarders for the setting of model plaster, dental stone, or high-strength stone
a. borax b. saliva c. set gypsum particles d. potassium sulfate e. slurry water |
a. borax b. saliva |
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Which of the following waxes is classified as a pattern of wax?
a. boxing b. sticky c. beading d. baseplate |
d. baseplate |
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Which of the following materials with small particle sizes is intended to remove softer materials that adhere to enamel or restorative surfaces?
a. finishing abrasives b. polishing abrasives c. cleansing abrasives d. aluminum oxide abrasives |
c. Cleansing abrasives |
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Which of the following compositions is used as a home whitening product?
a. 22% carbamide peroxide b. 33-35% hydrogen peroxide c. 35% hydrogen peroxide with silica d. 30% calcium, phosphate, and fluoride ions |
a. 22% carbamide peroxide |
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Which of the following are uses of ZOE? a. Base b. Periodontal pack c. Temporary cement d. Impression material e. Permanent restoration |
A,B,C,D
Base Periodontal pack Temporary cement Impression material |
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Which is the term for uptake of hydrocolloid?
a. Hysteresis b. Syneresis c. Imbibition d. Viscosity |
c. Imbibition |
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The layer of debris that remains on the tooth after a tooth is prepared or cut for a restoration is known as a/an:
a. adherend b. resin tag c. enamel tag d. smear layer e. hybrid layer |
d. smear layer |
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Which of the following characteristics apply to composite resin materials:
a. used as a cement b. sets through condensation polymerization c. expands with polymerization d. macrofilled composites are used often e. polymperization light, chemical, heat |
ABCE
used as cement sets through condensation polymerization expands with polymerization polymerization, light, chemical heat |
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Which of the following restorative materials releases and absorbs fluoride and is used to prevent recurrent decay?
a. porcelain b. amalgam c. glass ionomer d. methyl methacrylate |
c. glass ionomer |
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Which composite would be the best choice for an occlusal restoration?
a. hybrid b. macrofil c. microfil |
b. macrofil |
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Which of the following are benefits of adding high amounts of copper to an amalgam alloy?
a. high strength b. early strength c. corrosion resistance d. increased expansion e. increased longevity |
ABCE
high strength early strength corrosion resistance increased longecity |
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All of the following apply to mixing alginate material except:
a. Adding powder to liquid b. Using a clean bowl and spatula c. Powder to liquid ration of 1:2 d. Mixing ingredients until homogenous e. Fluffing the alginate
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c. powder to liquid ration of 1:2 |
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When filling the impression tray, you load from front to back. When inserting the tray, you seat it anterior to posterior
a. both true b. both false c. first true, second false d. first false, second true |
b. both false |
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A class V restoration is found on the:
a. occlusal pits and fissures b. incisal edge c. proximal surfaces of anterior teeth d. proximal surfaces of posterior teeth e. gingival third of facial or lingual tooth surface |
e. gingival third of facial or lingual tooth surface |
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It is important to pour up impression within 30 minutes of taking the impression because hysteresis occurs with alginate impressions
a. both true b. both false c. first true second false d. first false second true |
c. first true second false |
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An athletic mouthguard protects teeth as it absorbs energy and returns to its original shape. This property is known as:
a. toughness b. resilience c. malleability d. ultimate strength |
b. resilience |
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The property that causes gradual dimensional change of a dental material under load or stress is:
a. creep b. fatigue c. proportional limit d. elastic deformation e. stress concentration
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a. creep |
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Which best describes the intensity of color?
a. hue b. value c. chroma d. translucency |
c. chroma |
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Light cured sealant material cannot be activated by natural light. The instruction must be followed to avoid over curing the sealant.
a. both true b. both false c. first true second false d. first false second true |
b. both false |
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Which two of the following will produce the most abrasion to the tooth surface?
a. small particle and regular shape b. large particle and irregular shape c. abrasive material not as hard as the substrate being polished d. high speed with heavy pressure e. low speed with moderate pressure |
b. large particle and irregular shape
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Which of the following would be the most effective in tooth whitening if all were applied for the same amount of time?
a. 10% carbamide peroxide b. 10% hydrogen peroxide c. 20% carbamide peroxide d. 14% hydrogen peroxide e. 5% hydrogen peroxide |
d. 14% hydrogen peroxide |
