A+ Biology questions and answers

1. What class of dental cavities involves the incisal edge of anterior teeth?

A. Class III

B. Class II

C. Class I

D. Class IV

 

2. The wax used for the fabrication of wax patterns for cast restorations as part of the lost-wax technique is _______ wax.

A. impression

B. utility

C. registration

D. inlay

 

3. Which cement is known for its ability to stimulate the formation of secondary dentin?

A. Calcium hydroxide

B. Zinc phosphate

C. ZOE

D. Polycarboxylate

 

4. Often, caries will develop in an area of the tooth that’s not readily accessible. Which cavity preparation form defines this?

A. Resistance

B. Retention

C. Outline

D. Convenience

 

5. Which drug administration route produces the most rapid drug response and has an almost immediate onset of action?

A. Topical

B. Oral

C. Inhalational

D. Injectable

 

6. The impression materials of choice for crown and bridge impressions include all the following, except

A. polyvinylsiloxane.

B. polysulfide.

C. polyether.

D. alginate.

 

7. Which of the following is not part of the anesthetic syringe?

A. Threaded tip

B. Loading coil

C. Piston

D. Harpoon

 

8. What cement should generally not be used with acrylic temporaries that will be placed a long time?

A. Polycarboxylate

B. Zinc oxide noneugenol

C. ZOE

D. Calcium hydroxide

 

9. Which of these instruments is used to create the anatomy in an amalgam restoration?

A. Excavator

B. Carver

C. Burnisher

D. Carrier

 

10. Dental alloy is composed of three primary metals. Which of the following is not one of the three primary metals?

A. Silver

B. Copper

C. Tin

D. Lead

 

11. Alginate is another name for

A. reversible hydrocolloid.

B. irreversible hydrocolloid.

C. polyether.

D. polysiloxane.

 

12. Polyether impression materials are available in all viscosities, except

A. light-body.

B. heavy-body.

C. putty.

D. medium-body.

 

13. Which one of the following classes of controlled substances are experimental drugs and can’t be administered to patients?

A. Class VII

B. Class V

C. Class II

D. Class I

 

14. A point angle of a cavity preparation involves how many surfaces?

A. Two

B. Four

C. Three

D. One

 

15. Water cooled trays are used with which impression material?

A. Reversible hydrocolloid

B. Zinc oxide and eugenol paste

C. Addition-reaction silicone (polysiloxane)

D. Polyether

 

16. The base of a dental cast is trimmed using

A. boxing wax.

B. a hydrocolloid conditioner.

C. a model trimmer.

D. a vibrator.

 

17. Which of the following is not a stage of general anesthesia?

A. Surgical

B. Analgesia

C. Anxiety

D. Excitement

 

18. Which of the following is the reason for aspirating prior to injection?

A. To withdraw any excess fluid in the tissues

B. To prevent the injection of medication into a blood vessel

C. To reduce the pain of injection

D. To determine if the syringe is in working order

19. Vacuum molding can be used for all the following techniques, except

A. custom trays.

B. lost wax process.

C. bleaching mouth guards.

D. nightguards.

 

20. What item is used to hold the matrix band in contact with the interproximal area of the preparation?

A. Retainer

B. Cotton roll

C. Wedge

D. Matrix

 

21. All the following impression materials can be mixed with an automixing system, except

A. polyether.

B. polysiloxane.

C. addition-reaction silicone.

D. polysulfide.

 

22. How many planes of analgesia are there in the administration of nitrous oxide?

A. Four

B. Seven

C. Three

D. Five

 

23. Varnishes act as a sealer and are painted on the

A. pulp.

B. dentin.

C. root.

D. cementum.

 

24. What type of resin cement is used in the bonded amalgam technique?

A. Photo-cure

B. Dual-cure

C. Self-cure

D. Light-cure

 

25. Bite registrations, setting denture teeth, and verifying denture relationships can be accomplished with _______ wax.

A. impression

B. baseplate

C. boxing

D. inlay

 

26. The material that’s painted in a tray to allow an impression material to attach to the tray is called a

A. tray-body impression material.

B. tray try-in.

C. tray adhesive.

D. plastic bonding agent.

 

27. A custom tray is recommended for use with which impression material?

A. Polysulfide

B. Impression compound

C. Reversible hydrocolloid

D. Irreversible hydrocolloid

 

28. Which of the following agents are resistant to antibiotics?

A. Viruses

B. Gram-positive bacteria

C. Gram-negative bacteria

D. Parasites

 

29. When loading a crown or bridge with a ZOE or glass ionomer luting cement, which of the following steps is not taken?

A. Etch the crown

B. Check for air bubbles

C. Remove excess cement

D. Dry any water droplets

 

30. Examples of elastomeric impression materials include all the following, except

A. polysulfide.

B. polyether.

C. addition-reaction silicone.

D. impression compound.

 

31. Which of these restoratives would need to be placed in 2.5 mm increments?

A. Amalgam

B. Self-cure composite

C. Light-cure composite

D. Resin ionomer

 

32. Which of the following is another way to write the term nitrous oxide?

A. N2O

B. NO2

C. N2O2

D. NO

 

33. Disinfection of impression materials is usually accomplished by

A. allowing the impression to sit 24 hours in water until all the organisms die.

B. sterilization with high heat.

C. spray or immersion in a chemical disinfectant.

D. sterilization with steam under pressure.

 

34. For which of the following indications is local anesthesia not warranted?

A. Ulcers

B. Preinjection

C. Infections

D. Wounds

 

35. Which of the following medications is an example of a benzodiazepine?

A. Nitrous oxide

B. Alcohol

C. Halothane

D. Diazepam

 

36. Which of these steps would be done first in the enamel bonding technique?

A. Rinsing

B. Applying resin

C. Etching

D. Drying

 

37. What private dental organization works with the U.S. Food and Drug Administration to regulate dental materials and devices?

A. BAR

B. AMA

C. ADA

D. OSHA

 

38. Which of these materials is not used as a filler in composites?

A. Glass

B. Quartz

C. Silica

D. Silver

 

39. Most cements are mixed on a polycoated mix pad. What property of zinc phosphates requires that they be mixed on a glass slab?

A. High viscosity

B. Highly acidic

C. Low viscosity

D. Exothermic

 

40. All the following are viscosities that are provided with polyvinylsiloxanes, except

A. light-bodied.

B. rigid-bodied.

C. putty.

D. medium-bodied.

 

41. Which of the following medications is an example of a narcotic?

A. Vicodin

B. Bufferin

C. Motrin

D. Tylenol

 

42. Adding more water than recommended to mix dental stone will lead to a

A. weaker, faster-setting stone.

B. stronger, slower-setting stone.

C. weaker, slower-setting stone.

D. stronger, faster-setting stone.

 

43. Which of the following is not available in a pre-capsulated form?

A. Resin ionomer

B. Amalgam

C. Glass ionomer

D. Self-cure composite

 

44. When a custom tray is fabricated from self-cure acrylic resin, the tray must sit for _______ hours after fabrication before it should be used.

A. 24

B. 8

C. 16

D. 4

 

45. If the mixing time is increased with the recommended volume of water to a given weight of stone, the stone will

A. set at the same rate.

B. won’t set at all.

C. set slower.

D. set faster.

 

46. The type of gypsum product used because of its hardness and wear resistance for waxing patterns to make crowns and bridges is

A. mounting stone.

B. pattern stone.

C. die stone.

D. impression plaster.

 

47. All the following are bite registration materials, except

A. wax.

B. polysulfide.

C. zinc oxide and eugenol paste.

D. polyvinylsiloxane.

 

48. Which of the following is not an advantage in administering nitrous oxide?

A. Easy to administer

B. Useful with the handicapped

C. Easy to use

D. Rapid recovery

 

49. Which step in dentin bonding is responsible for wetting the tooth surface in preparation for the bonding resin?

A. Etching

B. Rinsing

C. Priming

D. Conditioning

 

50. Which of the following is the most commonly used inhalational agent in dentistry?

A. Nitrous oxide

B. Enflurane

C. Diazepam

D. Halothane