Dental Materials

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  1. porcelain restorations have
    A. low wear resistance
    B. no disadvantages
    C. great stain resistance
    D. easy reparability
    C. great stain resistance
    (this multiple choice question has been scrambled)
  2. porcelain bonds to metal by which one of the following mechanisms
    A.fuses to oxides on the surface of the metal
    B. shrinks when it is fired and locks itself onto metal
    C. penetrates the surface of the metal
    D. micromechanical retention such as resin to etched enamel
    A. fuses to oxides on the surface of the metal
    (this multiple choice question has been scrambled)
  3. the main advantage of all ceramic crowns over porcelain bonded to metal crowns is
    A. their strength
    B. their superior esthetics
    C. teh ease of taking shades
    D. their ease of cementation
    B. their superior esthetics
    (this multiple choice question has been scrambled)
  4. the main drawback of feldspathic porcelain for all porcelain crowns is
    A. their tendency to fracture
    B. the shrinkage when fired makes them difficult to fit the prepared tooth
    C. their opacity
    D. the difficulty involved in making them
    A. their tendency to fracture
    (this multiple choice question has been scrambled)
  5. an in offic CAD/CAM system for cermaic restorations provides all of the following advantages except one:
    A.the procedure can be completed in one visit
    B. a provisional crown is not needed
    C. local anesthesia is not needed
    D. the restoration does not have to be fabricated in an outside lab
    C. local anesthesia is not needed
    (this multiple choice question has been scrambled)
  6. the basic color of the tooth is called?
    hue
  7. all of hte following should be avoided when taking the shade of a tooth except one:
    A. neutral wall colors in the rooms
    B. brightly colored clothing
    C. dirty teeth
    D. lipstick on the pt
    A. neutral wall colors in the rooms
    (this multiple choice question has been scrambled)
  8. all of the following materials should be avoided around ceramic restorations except one:
    A. acid etchant
    B. coarse prophy paste
    C. acidulated topical fluoride
    D. alginate impression material
    D. alginate impression material
    (this multiple choice question has been scrambled)
  9. the impression for a CAD/CAM crown is
    A. done with alginate
    B. done with polyether imprssion material
    C. done wtih polyvinylsiloxane impression material
    D. done by capturing an image of the prepared tooth with an optical scanner
    D. done by capturing an image of the prepared tooth with an optical scanner
    (this multiple choice question has been scrambled)
  10. when preparing a procelain fused to metal crown the technician applies feldspathic porcelain in layers to hte metal copin. this initial layer is
    A. translucent procelain to mimic enamel
    B. opaque porcelain to hide the oxidized metal
    C. body porcelain to mimic dentin
    B. opaque porcelain to hide oxidized metal
    (this multiple choice question has been scrambled)
  11. occasionally special porcelain stains are used on the surface of porcelain. these stains contain metal oxides and are used to
    A. hide flaws created in the porcelain by firing it at high temperatures
    B. create a shiny, smooth surface
    C. mimic white spots or fine crack lines to resemble adjacent teeth
    C. mimic white spots or fine crack lines to resmeble adjacent teeith
    (this multiple choice question has been scrambled)
  12. which one of the follwing statments about porcelain vaneers is false
    A. porcelain veneers must be handled carefully when one is trying them in because they are very fragile until bonded to the tooth
    B. porcelain veneers are more durable than composite veneers
    C. it is difficult to mask a darkly colored tooth with a porcelain veneer
    D. porcelain veneers are usually cemented with zinc phosphate or glass ionomer cement
    D. porcelain veneers are usually cemented with zinc phosphate or glass ionomer cement
    (this multiple choice question has been scrambled)
  13. when assisting the dentist with taking the shade of a tooth the dental assistant should
    A. cover brightly colored clothing with a pastel neutral colored bib
    B. shine the operatory light directly on the teeth
    C. stare at teh tooth and shade guide intensely for at least 30 seconds to let the eyes adjust to the colors
    D. dry the teeth thoroughly
    A. cover brightly colored clothing with a pastel neutral colored bib
    (this multiple choice question has been scrambled)
  14. when one istaking photographs of the teeth to send to the dental laboratory to help convey the correct shade, what is the proper ocation for the shade tab in the photograph?
    A. in the same plane as the tooth being matched
    B. inside the mouth in front of the teeth
    C.outside the mouth
    d. non of the above (the shade tabe does not have to be included in the photograph
    A. in the same plane as the tooth being matched
    (this multiple choice question has been scrambled)
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74902
Card Set
Dental Materials
Description
chapter 8 review questions
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