Dental Materials Exam Practice Tests
Course Introduction
Dental Materials explores the fundamental properties, composition, and clinical applications of materials used in dental practice. The course covers a wide range of substances, including metals, ceramics, polymers, and composites, focusing on their physical, chemical, and mechanical characteristics. Students learn about the selection criteria for appropriate dental materials based on biocompatibility, durability, aesthetics, and function. The course also addresses the handling, manipulation, and evaluation of materials in preventive, restorative, and prosthetic dentistry, emphasizing current advances and standards in dental material science.
Recommended Textbook
Dental Materials Properties and Manipulation 10th Edition by John M. Powers
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15 Chapters
584 Verified Questions
584 Flashcards
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Chapter 1: Introduction to Restorative Dental Materials
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40 Verified Questions
40 Flashcards
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Sample Questions
Q1) Fluoride gels,rinses,and varnishes are highly effective at preventing:
A) drifting of teeth.
B) gingival recession.
C) caries.
D) staining of teeth.
Answer: C
Q2) Of the following,which is not an advantage of finishing and polishing a restoration?
A) Minimized plaque retention
B) Minimized stain
C) Minimized corrosion
D) Minimized recurrent caries
Answer: B
Q3) Of the following,which material would not be used for an intracoronal restoration?
A) Amalgam
B) Porcelain
C) Composite resin
Answer: B
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Chapter 2: Properties of Materials
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43 Verified Questions
43 Flashcards
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Sample Questions
Q1) Which of the following choices encourage good wetting?
A) High-energy solid
B) Low-energy solid
C) High-energy liquid
D) A and C
E) B and C
Answer: A
Q2) _____ refers to the uptake of liquid by a bulk solid.
A) Absorption
B) Adsorption
C) Hydrophilic
D) Hydrophobic
Answer: A
Q3) Which of the following materials has the highest rating related to thermal conductivity?
A) Enamel
B) Glass ionomer
C) Gold alloy
D) Dentin
Answer: C
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Chapter 3: Preventive Dental Materials
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39 Verified Questions
39 Flashcards
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Sample Questions
Q1) Identify four criteria for not using a pit and fissure sealant.
Answer: Current evidence indicates that sealants should not be used on the teeth of a patient who does not cooperate in maintaining good oral hygiene,on occlusal surfaces where pits and fissures do not exist,on teeth that have been free of caries for several years,and on teeth with many proximal lesions.
Q2) If teeth become contaminated with saliva after they are etched,the operator should:
A) rinse the area again and dry it.
B) re-etch, rinse, and dry.
C) use the high velocity suction to dry.
D) add more cotton rolls for moisture control.
Answer: B
Q3) Sealants are polymerized by using a(n)_____ spectrum light.
A) ultraviolet.
B) incandescent.
C) fluorescent.
D) visible.
Answer: D
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5
Chapter 4: Direct Esthetic Restorative Materials
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40 Flashcards
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Sample Questions
Q1) Bond strength is exceeded and gaps occur at the cavosurface margin as a result of:
A) inadequate cure.
B) saliva contamination.
C) inadequate etch.
D) polymerization shrinkage.
Q2) Advantages of composite provisional materials over acrylic provisional materials include:
A) lower cost.
B) doughy stage for easier handling.
C) harder, more brittle texture.
D) lower heat release during curing.
Q3) The setting reaction of a composite restorative material is:
A) gelation.
B) polymerization.
C) hysteresis.
D) reduction.
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Chapter 5: Dental Amalgam
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38 Verified Questions
38 Flashcards
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Sample Questions
Q1) ________ mercury vapor is released from dental amalgam per day,as a result of chewing.
A) 1 to 2 µg
B) 2 to 4 wt %
C) 50%
D) No vapor is released
Q2) Which of the following statements is true of admixed amalgam in contrast with spherical amalgam? Admixed amalgams:
A) contain only irregularly shaped particles, not spherically shaped particles.
B) require more condensation force than spherical amalgams.
C) require less mercury than spherical amalgams.
D) set somewhat faster than spherical amalgams.
Q3) Which of the following elements is a liquid at room temperature?
A) Beryllium
B) Sodium
C) Lead
D) Mercury
E) Gallium
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7
Chapter 6: Finishing, polishing, and Cleansing Materials
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38 Flashcards
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Sample Questions
Q1) The smoothest surface of a gold casting can be produced with a:
A) chamois.
B) fine cuttle disk.
C) crocus disk with rouge.
D) polished wax, pickled casting.
Q2) _____ abrasive disks are beige.
A) Aluminum oxide
B) Garnet
C) Cuttle
D) Silicon carbide
Q3) High-copper dental amalgam:
A) should not be polished.
B) can be polished after 8 to 12 minutes.
C) should be polished after 24 hours.
Q4) What is the purpose of a humectant in toothpaste?
A) Function as an abrasive
B) Prevent dehydration
C) Function as a binder
D) Prevent dental caries
E) Reduce the rate of formation of supragingival calculus
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Chapter 7: Cements
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Sample Questions
Q1) Esthetic resin cements are used to:
A) bond metal restorations.
B) bond ceramic restorations.
C) bond orthodontic brackets.
D) fill root canals.
Q2) Which type of cement has a powder composed of aluminosilicate glass?
A) Zinc polycarboxylate
B) Zinc oxide-eugenol
C) Zinc phosphate
D) Glass ionomer
Q3) Which of the following cements is used in order to stimulate the formation of reparative dentin?
A) Zinc phosphate
B) Zinc polycarboxylate
C) Calcium hydroxide
D) Zinc oxide-eugenol
E) Hybrid ionomer
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9
Chapter 8: Impression Materials
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Sample Questions
Q1) Sodium phosphate acts as a(n)_____ during the setting reaction of alginate hydrocolloid.
A) initiator
B) retarder
C) accelerator
D) sweetener
E) disinfectant
Q2) Measurement of dimensional changes showed that immersion of alginate impressions for _____ did not affect their clinical accuracy.
A) 10 minutes
B) 30 minutes
C) 1 hour
D) 5 days
E) 2 weeks
Q3) Alginate hydrocolloid is supplied:
A) in compules.
B) in two syringes to be mixed together.
C) in two tubs as a putty system for hand kneading.
D) as a thixotropic gel.
E) as a powder.
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Chapter 9: Model and Die Materials
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Sample Questions
Q1) The final setting time is defined as:
A) the point where the gypsum can be removed without fracture.
B) the point where the gypsum can be removed without distortion.
C) the point where the exothermic reaction is complete.
D) all of the above.
E) only A and B.
Q2) When a model or die is wet,its compressive and tensile strength is approximately _____ its strength when dry.
A) 4 times
B) twice
C) one-half
D) one-quarter
E) one-sixteenth
Q3) The _____ and _____ dense the crystal of the hemihydrate,the less excess water required to get a workable mass.
A) larger; more
B) larger; less
C) smaller; more
D) smaller; less
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Chapter 10: Waxes
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Sample Questions
Q1) Which of the following waxes may be used for bite registration?
A) Baseplate wax
B) 28-gauge casting wax
C) Bite-registration wax
D) A, B, and C
E) A and C
Q2) Which of the following types of wax is used to fabricate wax patterns for crowns,inlays,and bridges?
A) Casting wax
B) Inlay wax
C) Boxing wax
D) Utility wax
Q3) Residual stress is stress remaining in a wax as a result of manipulation during heating,cooling,bending,carving,or other manipulation.Manipulation of wax puts molecules of the wax into positions that they like and can change because of their solid state.
A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.
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Chapter 11: Casting Alloys, wrought Alloys, and Solders
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Sample Questions
Q1) Gold is used in dental alloys primarily because of:
A) its resistance to corrosion.
B) its relatively high melting point.
C) its yellow color.
D) A, B, and C.
E) A and C.
Q2) Common base metals used in dentistry include:
A) gold.
B) silver.
C) platinum.
D) palladium.
Q3) According to the ADA classification for dental casting alloys,high-noble alloys must have a noble metal content of at least ____% by weight.
A) 20
B) 40
C) 60
D) 80
E) 90
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Chapter 12: Casting and Soldering
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Sample Questions
Q1) A casting ring:
A) retains the investment while it sets.
B) is commonly lined with a dry ceramic-paper liner.
C) is commonly lined with a wet ceramic-paper liner.
D) both A and B.
E) both A and C.
Q2) To prevent premature freezing in the sprue channel,sprues are generally as _____ in diameter and as _____ as possible.
A) small; long
B) small; short
C) large; long
D) large; short
Q3) Which of the following statements is(are)true of sprues?
A) Sprues may be made of wax, plastic, or metal.
B) Sprues are placed on cusps of the wax pattern.
C) Sprues are placed in the central groove of the wax pattern.
D) A and B are true statements.
E) A and C are true statements.
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14
Chapter 13: Polymers in Prosthodontics
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Sample Questions
Q1) Which of the following statements is true concerning denture acrylic polymers and water sorption?
A) Denture acrylic polymers have low water sorption.
B) Water sorption causes denture expansion of as much as 10%.
C) Sorption-mediated expansion compensates to some degree for polymerization shrinkage.
D) Months are necessary for full water sorption to occur.
Q2) Which of the following statements is(are)true of denture soft liners?
A) They may be used for patients with severe undercuts of the edentulous ridges.
B) The hardness of the long-term acrylic materials increases slowly as the plasticizer is leached out by exposure to oral fluids.
C) Silicone liners do not harden as time passes, because they contain no plasticizer.
D) A, B, and C are true statements.
E) A and C are true statements.
Q3) When removed from the mouth,dentures:
A) should be boiled and then air dried to kill bacteria and fungi.
B) are best stored in water.
C) should be stored in rubbing alcohol.
D) should be desiccated with acetone to prevent ingress of bacteria.
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Page 15
Chapter 14: Dental Ceramics
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Sample Questions
Q1) Which is an advantage of milling a ceramic crown?
A) Green state is maximized.
B) It is a one-step process.
C) It requires an elastomeric impression.
D) Laboratory turnaround is minimized.
Q2) When contrasting ceramic inlays and composite to esthetically restore small posterior lesions:
A) ceramic inlays use a less aggressive tooth preparation.
B) ceramic inlays require more manipulation of materials by the practitioner.
C) composites require more chair time.
D) composites are less customizable in terms of shade, shape, and restoration design.
Q3) The terms ceramic and porcelain are often used interchangeably.Porcelain is a type of ceramic that results when feldspar,silica,and alumina are fired together with fluxes.
A) Statement 1 is correct; statement 2 is correct.
B) Statement 1 is correct; statement 2 is incorrect.
C) Statement 1 is incorrect; statement 2 is correct.
D) Statement 1 is incorrect; statement 2 is incorrect.
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Page 16
Chapter 15: Dental Implants
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Sample Questions
Q1) A rate of horizontal bone loss greater than _____ mm per year is a sign of a failing implant.
A) 0.01
B) 0.1
C) 0.3
D) 0.5
Q2) For most clinical situations,implant success rates are more than ____% as long as the implant osseointegrates initially and the clinical environment is not extreme.
A) 50
B) 75
C) 90
D) 95
Q3) Burs for preparation of the implant site are composed of special alloys of:
A) stainless steel.
B) nickel.
C) titanium.
D) platinum.
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Page 17