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92 Cards in this Set
- Front
- Back
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In the United States, standards for dental materials are developed and administered by the: a. FDA (Food and Drug Administration b. ADA (American Dental Association) c. AADR (American Association for Dental Research) d. OSHA (Occupational Safety and Health Administration) |
B. ADA (American Association for Dental Reserch) |
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An amalgam restoration located on the gingival third of tooth #3 would be a Class ______ restoration. a. I b. II c. III d. IV e. V f. VI |
E. V
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When the temperature changes in the mouth, the teeth and most restorative material expand and contract by the same amount. No leakage occurs around the restoration. a. The first statement is true, the second false b. The first statement is false, the second true c. Both statements are true d. Both statements are false |
D. Both statements are false |
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Which of the following restorations are utilized when a substantial amount of tooth is missing? a. Crown b. Pontic c. Implant d. Fixed partial denture |
A. Crown
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If a restoration is fabricated on a replica (positive reproduction) of a patient’s teeth, it is referred to as a: a. Student model b. Cast c. Diagnostic cast d. Any of the above terms may be used |
B. Cast
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Medical devices are grouped into three categories according to Medical Device Amendment of 1976. Which class of devices is most regulated? a. I b. II c. III d. IV |
C. III
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Molecules found in a pane of glass can be best described as: a. Crystalline solid, having short-range order only b. Crystalline solid, having both short-range order and long range order c. Amorphous solid, having long-range order d. Amorphous solid, having short-range order |
D. Amorphous solid, having short-range order
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What type of bond is formed when the electrons are shared by all the atoms that make up the object and may be thought of as “positive cores” in a “cloud of negative mobile valence electrons”? a. Metallic b. Secondary c. Covalent d. Ionic |
A. Metallic
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A dental polymer with many cross-links as compared to one with no cross-links would be a dental material that is: a. Flexible but strong b. Flexible but weak c. Stiff and strong d. Stiff but weak |
C. Stiff and strong
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When the shared electrons of a covalent bond are not shared equally, and one of the bonded atoms is partially positive and the other is partially negative, a ___________ is formed. a. Permanent dipole b. Fluctuating dipole c. Hydrogen bond d. Primary bond |
A. Permanent dipole
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A mixture of two liquids that do not blend together to form one liquid is termed a (an): a. Composite b. Emulsion c. Colloid d. Solution |
B. Emulsion
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A drop of water on a Popsicle is an example of: a. Poor wetting (low contact angle) b. Good wetting (high contact angle) c. Good wetting (low contact angle) d. Poor wetting (high contact angle) |
C. Good wetting (low contact angle)
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The modulus of elasticity is an indication of what property of a material? a. Resilience b. Strength c. Stiffness d. Tension |
C. Stiffness
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When a stress is induced in a material that is greater than the material’s yield strength, the stress is ___________ proportional to the strain, and the material does not return to its original shape. a. Always b. No longer c. Equally d. None of the above |
B. No longer
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An example of a physical property is: a. Density b. Strength c. Stiffness d. Setting reaction |
A. Density
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The ability of a material to dissolve in liquid is termed: a. Viscosity b. Water sorption c. Solubility d. Wetting |
C. Solubility
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The rate of heat flow through a material is referred to as: a. Heat of fusion b. Coefficient of thermal expansion c. Heat capacity d. Thermal conductivity |
D. Thermal conductivity
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Fingernail polish remover has “solvent” properties, as it will remove the polish from our fingernails. Another property polish remover has is its tendency to evaporate. Fingernail polish o have: a. A high vapor pressure b. A low vapor pressure c. No vapor pressure d. An intermittent vapor pressure |
A. a high vapor pressure
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A hardened cement having “low” ___________ can firmly hold a patient’s gold crown in place for years in a wet environment. a. Solubility b. Compression c. Stress concentration d. Viscosity |
A. Solubility
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Postage stamps are not self-adhesive. The paper (actual stamp) is referred to as the _________, and the sticky material on the back of the stamp is termed the __________. a. Adherend, adhesive b. Adhesive, adherend c. Adhesive, bonding agent d. Adherend, biofilm |
A. Adherend, adhesive
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Number 1-8 the correct sequence of acid-etching and restoration placement. __ Clean surface is rinsed with water __ Etched surface is rinsed with water. __ Bonding resin is applied __ Enamel is cleaned with pumice __ Cleaned surface is dried with air __ Etched surface with dried with air __ Restorative material is applied __ Etchant is applied |
2,5,7,1,3,6,8,4
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Why do primary teeth need to be etched longer than permanent teeth? a. It compensates for potential behavioral management problems b. The enamel is denser on primary teeth c. The enamel rods are more regularly arranged than on permanent teeth d. The enamel rods are less regularly arranged than on permanent teeth |
D. The enamel rods are less regularly arranged than on permanent teeth.
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The “dentin debris” that is created when dentin is cut or prepared by dental instruments is called: a. Adhesive layer b. Smear layer c. Primer layer d. Chelating layer |
B. Smear layer
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An adhesive mechanism of a dentinal bonding system is a hybrid layer. It is composed of: a. The smear layer and resin b. Dentin primer and decalcified enamel c. Resin and decalcified enamel d. Resin and decalcified dentin |
D. Resin and decalcified dentin
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One problem with polymers is their high coeficients of thermal expansion. These coefficients can be ________ to __________ times great than that of tooth structure. a. 1 to 3 b. 3 to 5 c. 2 to 5 d. 2 to 10 |
D. 2 to 10
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What advantage do microfilled composites have compared to macrofilled composites? a. Low coefficient of thermal expansion b. Smooth an lustrous polished surface c. Greater overall strength d. Higher percentage of filler |
B. Smooth and lustrous polished surface
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A specific amount of composite (thickness) that is cured by a light source is termed: a. Depth of cure b. Incremental addition c. Depth of addition d. Incremental polymerization |
A. Depth of cure
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The __________ composite restorative materials are those with a lower viscosity (decreased filler) to aid in placement. a. Preventive resin b. Hybrid c. Flowable d. Condensable |
C. Flowable
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A combination of a pit and fissure sealant and a composite restoration is termed: a. Flowable composite b. Condensable composite c. Compomer d. Preventative resin restoration |
D. Preventative resin restoration
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Thermal expansion for microfill composite restorative material is considered to be: a. Poor b. Fair c. Good d. Very good |
A. Poor
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Composite materials that polymerize using light activation are: a. Initiated by mixing b. Not as popular as chemically activated resins c. Supplied as a single paste d. Lack the “set on demand” characteristic |
C. Supplied as a single paste
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Which of the following best describes microfill composite materials? a. Abrasion resistance is poor; filler size is 10-25 microns b. Abrasion resistance is poor; strength is high c. Polishability is poor; strength is high d. Polishability is very good; strength is low |
D. Polishability is very good; strength is low |
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Which of the following elements is used in the highest amount in an amalgam restoration? a. Tin b. Copper c. Silver d. Mercury e. Aluminum |
D. Mercury
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The elements composing the gamma-two (y2) phase (the weakest and most corrosion-prone phase) of the amalgam reaction are: a. Silver and tin b. Silver and mercury c. Tin and mercury d. Tin and tin |
C. Tin and Mercury
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Control of mercury content during mixing and condensing of amalgam must be carefully considered because: a. The higher the mercury content, the higher the strength and the lower the marginal breakdown. b. The lower the mercury content, the higher the strength and the lower the marginal breakdown. c. The higher the mercury content, the higher the strength and the greater the marginal breakdown d. The lower the mercury content, the higher the strength and the greater the marginal breakdown. |
B. The lower the mercury content, the higher the strengh and the lower the marginal breakdown
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The manufacturers of dental amalgam control all of the following except: a. Allow composition b. Rate of setting reaction c. Proper trituration technique d. Particle size |
C. Proper tritruation technique
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In the low copper or traditional amalgam reaction, tin reacts with mercury. In the high-copper amalgam reaction, tin reacts with: a. Silver b. Copper c. Zinc d. Mercury |
B. Copper
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Ashley was condensing an amalgam during lab and she noticed that the triturated amalgam had a softer, “mushy” feel. What type of allow did she most, likely use in the mixed amalgam? a. Spherical b. Lathe-cut c. Admixed d. Blended |
A. Spherical
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Amalgam may be used for a variety of restorative procedures. All of the following pertain to the use of amalgam, EXCEPT: a. Good service to patients at a reasonable cost b. For cingulum pit areas on the lingual of anterior teeth c. Amalgam cores d. Restoring Class I, II, IV, and V caries |
D. Restoring Class I, II, IV, and V caries
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The use of gold foil is limited small restorations because if its: a. Short-term longevity b. Low strength compared to other restorative materials c. High cost of gold foil compared to other materials d. Unique handling characteristics |
B. Low strength compared to other restorative materials
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Which of the following cements are available in a single-dose capsule, much like that of silver amalgam filling material? a. Polycarboxylate b. Silicate c. ZOE d. Glass ionomer e. Zinc phosphate |
D. Glass Ionomer
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All of the following are true for ZOE EXCEPT: a. It releases fluoride b. It lacks strength c. It is an obtundent material d. It protects the pulp |
A. It releases fluroide
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When glass ionomer is mixed too slowly, the resulting mix is: a. Thin b. Thick c. Lumpy d. Granular |
B. Thick
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During mixing, which of the following cements should use as much of the area on the slab as possible to reduce the exothermic reaction? a. Polycarboxylate b. Glass ionomer c. ZOE d. Zinc phosphate |
D. Zinc Phosphate
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Which of the following is a common additive to glass powder, reduces melting temperature, and improves the flow of molten glass? a. Quartz b. Fluoride c. Silicate d. Oxides |
B. Fluoride
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The disadvantage, or drawback, of using polycarboxylate cement is: a. Lack of strength b. Ability to bond to tooth structure c. Biocompatibility d. Lack of sufficient clinical data for long term use |
A. Lack of Strength
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Alginate impression material is: a. Expensive compared with other impression materials b. Easy to use c. Not affected by gain or loss of water d. Well known for its long-term stability |
B. Easy to use
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Dr. Jones requested that you mix alginate and take and impression. While measuring the water, you got involved in conversation and did not notice how warm it was. This oversight will: a. Make the mix unusable b. Lengthen the gelation time c. Not affect the gelation time d. Shorten the gelation time |
D. Shorten the gelation time
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The brown past used in rubber base is called the: a. Polymer b. Accelerator c. Base d. Filler |
B. Accelerator
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Which of the following is an example of an inelastic impression material? a. Polysulfide b. ZOE impression past c. Alginate d. Addition silicone |
B. ZOE impression past
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The popularity of agar impression material is limited by the: a. High cost b. Need for special equipment c. Poor reproduction of detail d. Difficultly in pouring the impression |
B. Need for special equipment
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Addition silicones are the most popular type of rubber impression materials. The reason for this is cost. a. The first statement is true, the second false b. The first statement is false, the second true c. Both statements are true d. Both statements are false |
A. The first statement is true, the second is false
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Mrs. Smith has not been to the dentist for several years. It was found that she needed extensive restorative treatment, to which she agreed. You were asked to take impressions as the first step of her care. The impression material of choice would be: a. Agar b. Alginate c. Dental impression compound d. Addition silicone |
B. Alginate
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Which of the following impression materials set by physical means? a. Agar b. ZOE c. Alginate d. Addition silicone |
A. Agar
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The desirable strength of gypsum materials is ________ related to the amount of water used. a. Directly b. Indirectly c. Not d. Partially |
A. Directly
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The gypsum material known as “high-strength stone” may also be referred to as: a. Plaster b. Dental stone c. Type II stone d. Improved stone |
D. Improved stone
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To make a correct mix for dental stone when using 50 g. of powder, the amount of water would be approximately: a. 10 to 12 ml b. 14 to 15 ml c. 28 to 30 ml d. 45 to 50 ml |
B. 14 to 15 ml
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Decreasing the setting time of a dental material results in a product that: a. Will set faster b. Will set slower c. Does not affect the setting time d. Enhances the properties |
A. Will set faster
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When excess water is not present in a gypsum product, it is known as the: a. Wet strength b. Dry strength c. Initial setting time d. Surface strength |
B. Dry strength
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Initial and final setting times of gypsum can be determined with the use of Gilmore needles. A practical, easy method to determine final setting time in a dental office would be to: a. Set a timer for 20 minutes b. Observe the change from wet to dry strength c. Watch for the loss of gloss d. Attempt to penetrate the material with the mental spatula |
D. Attempt to penetrate the material with the mental spatula
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If the mold that is created for investing and casting does not __________ to compensate for the action of the metal alloy, the casting will not fit. a. Contract b. Equate c. Expand d. None of the above |
C. Expand
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Porcelain is “best suited” for which of the following? a. Full coverage posterior crowns b. MODFL onlays c. Veneers on anterior teeth d. MOD inlays |
C. Venners on anterior teeth
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Which of the following waxes is hard, leaves no burnout residue, and has a higher melting temperature? a. Boxing b. Rope c. Sticky d. Baseplate e. Inlay |
E. Inlay
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Identify the correct sequence in the centrifugal casting process. a. Add sprue to pattern, place in crucible former, invest, and then cast b. Add sprue to pattern, invest, place in crucible former, and then cast c. Place sprue in crucible former, add pattern to sprue, invest, and then cast d. Place sprue in crucible former, invest, add pattern to sprue, and then cast |
A. Add spure to pattern, place in crucible former, invest, and then cast
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The term used to define the process of firing porcelain powder to become a solid is: a. Liquidating b. Sintering c. Burnishing d. Investing |
B. Sintering |
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Which of the following is considered to be the fixed indirect restoration? a. Amalgam b. Direct gold (gold foil) c. Onlay d. Composite |
C. Onlay |
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Another name for a provisional restoration is a __________ restoration. a. Conditional b. Non-permanent c. Build-up d. Temporary |
D. Temporary
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An advantage of bonding porcelains to metal is: a. A precise fit of the metal b. The resulting opacity c. The resulting translucency d. Ease in plaque removal |
A. A precise fit of the metal |
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The term used when the denture teeth are set in wax is: a. Denture arrangement b. Denture setup c. Articulated setup d. Articulated arrangement |
B. Denture setup |
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Heat–Activated acrylic resin systems are very similar to chemically activated systems. The major difference (or exception) is: a. Heat–activated systems have much less strength than chemically activated systems b. More inhibitor is present in the liquid of heat–activated systems c. Chemical activator is present in the liquid of heat–activated systems d. No chemical activator is present in the liquid of heat–activated systems |
D. No chemical activator is present in the liquid of heat-activated systems |
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Partial denture frameworks usually include: a. clasps, denture base, and connectors b. teeth, clasps, and connectors c. clasps, connectors and mesh d. teeth, denture base, connectors, and clasps |
C. Clasps, connectors, and mesh
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Mandibular dentures are easier to wear than maxillary. Saliva helps to improve the suction needed to hold a denture in place. a. The first statement is true, the second false b. The first statement is false, the second true c. Both statements are true d. Both statements are false |
B. The first statement is false, the second true
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The acrylic resin of a partial denture is processed the same way as a complete denture EXCEPT: a. It take less time because fewer teeth are involved. b. The finishing and polishing technique is much different. c. The acrylic resin must flow through and around the mesh of the framework. d. It takes longer because of the design of the framework. |
C. The acrylic resin must flow through and around the mesh of the framework.
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The type of implant that involves cutting a hole into the alveolar bone and then pressing or screwing in the implant is called: a. Subperiosteal b. Staple c. Transosseous d. Endosseous |
D. Endosseous
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To ensure longevity and function of the implant, the patient is responsible for: a. Eventual payment in full of all implant procedures. b. Plaque control c. Application of tray–delivered fluoride d. Proper occlusion |
B. Plaque control
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All of the following conditions are contraindications for implant placement except: a. Recurrent caries b. Poor oral hygiene c. Diabetes d. Smoking |
A. Recurrent caries
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A patient who has a very small, or essentially no mandibular ridge, is said to have a (an): a. Atrophic dentulous mandible b. Atrophic edentulous mandible c. iatrogenic edentulous mandible d. Dysfunctional edentulous mandible |
B. Atrophic edentulous mandible
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The prosthodontic phase of implant treatment involves the placement of several "parts" or attachments. A patient who has completed the surgeries and restorative care would receive in order: a. cylinder, implant, abutment, crown b. implant, cylinder, abutment, crown c. cylinder, implant, crown, abutment d. implant, abutment, cylinder, crown |
D. Implant, abutment, cylinder, crown
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Which type of abrasive looks like a grayish–black sand and is sometimes called "corundum"? a. Tin oxide b. Garnet c. Pumice d. Emery e. Tripoli |
D. Emery
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Which abrasive is used as a slurry to polish amalgam restorations and is also called calcium carbonate? a. Silex b. Whiting (chalk) c. Pumice d. Aluminum oxide |
B. Whiting (Chalk)
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All of the following factors affect the rate of abrasion except one. Which one is the EXCEPTION? a. Pressure b. Speed c. Size of particle d. Bonded and coated abrasives |
D. Bonded and coated abrasives
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An example of a "vehicle" to be used with powders would be: a. Rubber cups b. Felt cones c. Glycerin d. Prophy brushes |
C. Glycerin
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During routine polishing with pumice, ____________ um of the fluoride–rich layer can be removed. a. 1–2 b. 3–4 c. 5–6 d. 7–8 |
B. 3-4
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Which of the following is harder than enamel? a. Pumice b. Amalgam c. Composite d. Gold alloy |
A. PUMICE
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The most frequently used abrasive in dentifrices is: a. Carbonates b. Pumice c. Silica d. Phosphates |
C. Silica
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Mrs. Smith presents for her prophylaxis appointment after a ear, rather than the 6 months prescribed time. She has tobacco stain on the lingual surfaces of her natural teeth, two gold alloy crowns and several esthetic restorations. Which combination of cleaning/polishing agents should be chosen? a. Traditional prophy paste, tin oxide, and a polishing agent for esthetic restorations b. Pumice, traditional prophypaste and a polishing agent for esthetic restorations c. Traditional prophy paste, pumice, and tin oxide d. Silex, tin oxide, and a traditional prophy paste |
A. Traditional prophy past, tin oxide, and a polishing agent for esthetic restorations |
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The term "nonvital" may be used to describe a tooth that has: a. Been treated with a root canal procedure b. A necrotic pulp c. No pulp tissue in the pulp cavity d. All of the above. |
D. All of the above
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Which of the following statements is the most accurate? A. Hydrogen peroxide is more stable than carbamide b. Carbamide peroxide is used to the nonvital tooth whitening technique known as a walking bleach. c. Hydrogen peroxide decomposes into water and free radicals of oxygen d. Carbamide peroxide is most often applied to teeth as a gel at a 35% concentration. |
C. Hydrogen peroxide decomposes into water and free radicals of oxygen
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Teeth with a moderate degree of ___________ are the most difficult to successfully whiten. a. Extrinsic food and beverage stain b. Yellow intrinsic discoloration c. Extrinsic tobacco stain d. Tetracycline stain |
D. Tetracycline stain
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Which of the following is the most common esthetic procedure in dentistry? a. Facial veneer b. All–porcelain crown c. Porcelain–bonded–to–metal crown d. Tooth whitening |
D. Tooth whitening |
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When should a bleached tooth be restored with a composite restoration? a. Immediately b. 1–2 days c. 3–4 days d. 1–2 weeks |
D. 1-2 weeks
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An aqueous cleaning technology used in pre–whitening and touch up whitening is dispensed in a: a. Gel b. Liquid c. Strip d. Swab |
D. Swab |
