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Dental Materials Test 4

40 Questions
Dentist Quizzes & Trivia

About gypsum materials and periodontal dressings

Questions and Answers
  • 1. 
    • A. 

      Expensive compared to other impression materials

    • B. 

      Easy to use

    • C. 

      Not affected by gain or loss of water

    • D. 

      Well known for its long-term stability

  • 2. 
    • A. 

      Thermoplastic

    • B. 

      Elastometric

    • C. 

      Inelastic

    • D. 

      Resins

  • 3. 
    Dr Jones requested that you mix alginate and take an impression. While measuring the water, you got involved in conversation and did not notice how warm ir was.  This oversight will:
    • A. 

      Make the mix unstable

    • B. 

      Lengthen the gelation time

    • C. 

      Not affect gelation time

    • D. 

      Shorten the gelation time

  • 4. 
    Which of the following  dental materials is an example of an aqueous elastometric?
    • A. 

      Impression compound

    • B. 

      ZOE impression paste

    • C. 

      Polysulfide

    • D. 

      Irreversible hydrocolloid

    • E. 

      Addition silicone

  • 5. 
    The brown paste used in rubber base is called the:
    • A. 

      Polymer

    • B. 

      Accelerator

    • C. 

      Base

    • D. 

      Filler

  • 6. 
    Dental impression compound is known as a/an
    • A. 

      Chemoplastic material

    • B. 

      Irreversible material

    • C. 

      Hydroelastic material

    • D. 

      Thermoplastic material

  • 7. 
    • A. 

      Polysulfide

    • B. 

      ZOE impression paste

    • C. 

      Alginate

    • D. 

      Addition silicone

  • 8. 
    The term used for the setting of hydrocolloid impression materials is
    • A. 

      Crystallization

    • B. 

      Polymerization

    • C. 

      Curing

    • D. 

      Gelation

  • 9. 
    The populatrity of agar impression material is limited by the:
    • A. 

      High cost

    • B. 

      Need for special equipment

    • C. 

      Poor reproduction of detail

    • D. 

      Difficulty in pouring the impression

  • 10. 
    • A. 

      Imbibition

    • B. 

      Gelation

    • C. 

      Syneresis

    • D. 

      Hysteresis

  • 11. 
    Addition silicones are the most popular type of rubber impression materials.  The reason for this is cost.
    • A. 

      True, false

    • B. 

      False, true

    • C. 

      Both true

    • D. 

      Both false

  • 12. 
    Custom impression trays are made on a model of the patient's arch.  Therefore, to make a custom tray, an alginate impression is also needed.
    • A. 

      True, false

    • B. 

      False, true

    • C. 

      Both true

    • D. 

      Both false

  • 13. 
    • A. 

      Agar

    • B. 

      Alginate

    • C. 

      Dental impression compound

    • D. 

      Addition silicone

  • 14. 
    The impression tray that is used to record the prepared tooth, a bite registration, and an impression of the opposing teeth is a:
    • A. 

      Stock tray

    • B. 

      Custom tray

    • C. 

      Triple tray

    • D. 

      Bite registration tray

  • 15. 
    Which of the following impression materials set by physcial means?
    • A. 

      Agar

    • B. 

      ZOE

    • C. 

      Alginate

    • D. 

      Addition silicone

  • 16. 
    The desirable strength of gympsum materials is ____ related to the amount of water used.
    • A. 

      Directly

    • B. 

      Indirectly

    • C. 

      Not

    • D. 

      Partially

  • 17. 
    For gypsum products, a suitable accelerator and retarder, respectively, would be:
    • A. 

      Ethyl alcohol and oleic acid

    • B. 

      Oleic asid and glycerin

    • C. 

      Borax and potassium sulfate

    • D. 

      Potassium sulfate and borax

  • 18. 
    The gypsum material known as "high strength stone" may be also referred  to as:
    • A. 

      Plaster

    • B. 

      Dental stone

    • C. 

      Type III stone

    • D. 

      Improved stone

  • 19. 
    The final setting time for gypsum products is typically:
    • A. 

      15-30 min

    • B. 

      30-45 min

    • C. 

      45-90 min

    • D. 

      90-120 min

  • 20. 
    To make a correct mix for dental stone when using 50 g of powder, the amount of water would be approximately:
    • A. 

      10-12 ml

    • B. 

      14-15 ml

    • C. 

      28-30 ml

    • D. 

      45-50 ml

  • 21. 
    Cathy and her parents will meet with an orthodontist to discuss an orthodontic treatment plan. At a previous appt, the orthodontist took impressions of Cathys maxillary and mandibular arches. The replicas made from each impression to discuss the treatment plan are termed:
    • A. 

      Casts

    • B. 

      Dies

    • C. 

      Study models

    • D. 

      Molds

  • 22. 
    Decreasing the setting time of a dental material results in a products that:
    • A. 

      Takes less time to set

    • B. 

      Takes more time to set

    • C. 

      Does not affect the setting time

    • D. 

      Enhances the properties

  • 23. 
    The weakest gypsum products is:
    • A. 

      Improved stone

    • B. 

      Dental stone

    • C. 

      Plaster

    • D. 

      Die stone

  • 24. 
    When excess water is not present in a gypsum product, it is knwon as the:
    • A. 

      Wet strength

    • B. 

      Dry strength

    • C. 

      Initial setting time

    • D. 

      Surface strength

  • 25. 
    The best way to mix gypsum products is to:
    • A. 

      "eyeball" the amount of powder added to water

    • B. 

      Add water to the powder

    • C. 

      Add powder to the water

    • D. 

      Add powder and water to the bowl simultaneously

  • 26. 
    Initial and final setting times of gypsum can be determined with the use of Gilmore Needles. A practical, wasy method to determine final setting time in a dental office would be to:
    • A. 

      Set a timer for 20 min

    • B. 

      Ovserce the c hange from wet to dry strength

    • C. 

      Watch for the loss of gloss

    • D. 

      Attempt to penetrate the material with the metal spatula

  • 27. 
    When the setting time of a dental material is increased, which of the following is true?
    • A. 

      The material sets slower

    • B. 

      The material sets faster

    • C. 

      The setting reaction does not change

    • D. 

      The setting reaction is increased

  • 28. 
    When preparing the patient for an impression the operator should:
    • A. 

      Explain the procedure to the patient

    • B. 

      Place a napkin on the patient to protect their clothing

    • C. 

      Place the patient in upright position

    • D. 

      Have the patient remove all removable appliances

    • E. 

      All of the above

  • 29. 
    When taking a maxillary impression, a right handed operator should be standing in which position?
    • A. 

      12:00

    • B. 

      7:00

    • C. 

      11:00

    • D. 

      9:00

  • 30. 
    When mixing alginate impression material:
    • A. 

      Add water to the powder

    • B. 

      Add the powder to the water

    • C. 

      Add them together at the same tiem

    • D. 

      It can be in any sequence

  • 31. 
    All of the following statements are true about the "working time" of alginate material except one.
    • A. 

      Working time begins when water and powder come together

    • B. 

      Cooler water increases working time

    • C. 

      Warmer water decreases working time

    • D. 

      Working time begins when the impression is seated

  • 32. 
    The typical mixing time for alginate is ___ and the setting time for regular-set material is ____
    • A. 

      1 min; 1-2 min

    • B. 

      1 min; 3-4 min

    • C. 

      3-4 min; 1 min

    • D. 

      1-2 min; 1 min

  • 33. 
    Why would the double pour technique be a preferred method of fabricatin a cast/study model?
    • A. 

      It is the quicker method of the two

    • B. 

      Prevents distortion of oral structures

    • C. 

      Produces a bettter reproduction of oral structures

    • D. 

      It is a safer technique

  • 34. 
    Which is the best indicator of the inital set of gypsum products?
    • A. 

      Loss of gloss

    • B. 

      Loss of resilience

    • C. 

      Decreased compressive strength

    • D. 

      Decreased elasticity

  • 35. 
    The overall, combined height of both maxillary and mandibular models should be ____ inches.
    • A. 

      1.5-2

    • B. 

      2-2.5

    • C. 

      2.5-3

    • D. 

      3-3.5

  • 36. 
    Which of the following would be a purpose for using the noneugenol mineral oxide surgical dressing?
    • A. 

      To decrease healing time

    • B. 

      To stop post surgical bleeding

    • C. 

      To help hold the healing tissues in place

    • D. 

      To keep bacteria away from the healing tissues

  • 37. 
    The noneugenol zinc oxide dressing is held in place by:
    • A. 

      Physical retention

    • B. 

      Adhesion to the tissues

    • C. 

      Sutures

    • D. 

      Adhesive foil

  • 38. 
    The finished noneugenol zinc oxide dressing placed after flap surgery should be:
    • A. 

      Extended to the occlusal surface

    • B. 

      Extended to the depth of the vestibule

    • C. 

      Lightly pressed into the interdental space to allow for easy removal

    • D. 

      Rigid with tapered edges

  • 39. 
    Which of the following statements regarding the noneugenol zinc oxide dressing would NOT be included in post surgical instructions following periodontal flap surgery?
    • A. 

      Do not consume warm foodstuffs for 2 hours following surgery

    • B. 

      If a piece of the dressing breaks off, return to the office immediately for emergency care

    • C. 

      If a small peice of fressing crumbles off, simply discard it

    • D. 

      Do not smoke for 2 hours following surgery

  • 40. 
    All of the following are proceudre that correctly follow removal of the perio dressing EXCEPT:
    • A. 

      The area is swabbed with a disinfectant and rinsed to remove food and bacterial debris

    • B. 

      The tissues are checked for the healing response and noted in the chart

    • C. 

      Residual pieces of dressing in and around the tissues are removed

    • D. 

      Areas of residual calc are charted for removal at the next scale and polish