Dental Materials

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Author:
cassiedh
ID:
64074
Filename:
Dental Materials
Updated:
2011-02-04 06:59:45
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Ch5review
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Description:
chapter 5 review questions
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  1. the acid used most commonly to etch tooth structure for bonding procedures is
    A. phosphoric
    B. hydrofluoric
    C. citric
    D. hydrochloric
    A. phosphoric
    (this multiple choice question has been scrambled)
  2. all of the following statements about bonding to enamel are true except one.
    A. achieved by chemical bonding
    B. achieved by micromechanical retention
    C. achieved by resin tags penetrating porosities in the enamel and by locking into surface roughness
    D. more reliable bond than the bond to dentin
    A. achieved by chemical bonding
    (this multiple choice question has been scrambled)
  3. bonding to dentin
    A. is best on dentin that has been etched with 35% phosphoric acid for 30 sec
    B. is inhibited by formation of the hybrid layer
    C. is best accomplished when the dentin is kept moist after etching
    D. is stronger when the dentin is well dried after etching
    C. is best accomplished when the dentin is kept moist after etching
    (this multiple choice question has been scrambled)
  4. all of the following statements about resin bonding agents are true except one
    A. they are dissolved in solvents that allow them to penetrate the water on the moist dentin
    B. they seal the dentin by penetrating into etched dentin surfaces and tubules
    C. they chemically bond to the dentin
    D. they chemically bond to composite resin
    C. they chemically bond to the dentin
    (this multiple choice question has been scrambled)
  5. self-etching bonding agents
    A. require rinsing after etching
    B. use 35% phosphoric acid as the etchant
    C. use acidic primers to etch the tooth structure
    d generally etch enamel equally as well as dentin
    C. use acidic primers to etch the tooth structure
    (this multiple choice question has been scrambled)
  6. total etch bonding systems
    A. do not provide a good etch to uncut enamel
    B. do not require drying of the primer
    C. do not require a separate etching and rinsing step
    D. may result in tooth sensitivity caused by over drying or over etching
    D. may result in tooth sensitivity caused by over drying or over etching
    (this multiple choice question has been scrambled)
  7. with the total etch system when bonding to dentin one of the following statements is true.
    A. the surface of prepared dentin should have visible water droplets
    B. once you have dried the etched surface bonding is hopeless
    C. the surface of the etched, washed and dried dentin should be glistening
    D. the dentin surface should be thoroughly dried after etching and rinsing
    C. the surface of the etched, washed and dried dentin should be glistening
    (this multiple choice question has been scrambled)
  8. dentin sensitivity can be caused by
    a. pressure changes in the column of fluid within the dentinal tubules
    b. stimulation of odontoblastic processes within the dentinal tubules
    c. open dentinal tubules
    d. over etching or over drying of the dentin
    e. all of the above
    e. all of the above
  9. the smear layer
    A. is a tenacious layer of cut too th debris on the surface of enamel and dentin
    B. is easily removed by rinsing with water
    C. is left on the dentin when bonding with the total etch technique
    D. is necessary for good boding
    A. is a tenacious layer of cut tooth debris on the surface of enamel and dentin
    (this multiple choice question has been scrambled)
  10. all of the following statements about bonding to repair fractured porcelain on a crown are true except one
    A. silane is applied after etching to enhance the bond of adhesive resins to porcelain
    B. the surface is cleaned and roughened
    C. 10% phosphoric acid is used to etching the porcelain
    D. composite resin is usually used to restore the fractured portion
    C. 10% phosphoric acid is used to etching the porcelain
    (this multiple choice question has been scrambled)
  11. which one of the following does NOT interfere with the formation of a good bond?
    A. saliva on the etched enamel or dentin
    B. oil lubricant from the handpiece
    C. flavoring agent in prophy paste
    D. moist dentin after rinsing etchant off and lightly drying
    D. moist dentin after rinsing etchant off and lightly drying
    (this multiple choice question has been scrambled)
  12. which one of the following is true regarding the bonding of amalgam to a cavity preparation
    A. wax is rubbed on inside of the matrix band to keep the band from being glued to the tooth by bonding resin
    B. the bonding resin should be light cured
    C. only the enamel is acid etched
    D. freshly mixed amalgam is condensed onto unset bonding resin
    D. freshly mixed amalgam is condensed onto unset bonding resin
    (this multiple choice question has been scrambled)
  13. when endodontic posts are bonded into root canals the boding agent should not be
    A. applied in a thin layer
    B. dual curing
    C. light curing
    D. self curing
    C. light curing
    (this multiple choice question has been scrambled)
  14. all of the following are correct steps for bonding orthodontic brackets except one
    A. the tooth surface is cleaned with pumice
    B. the enamel is rinsed and left slightly moist
    C. the resin adhesive is often used to bond the bracket
    D. the enamel is etched with 35% phosphoric acid for approximately 30 seconds
    B. the enamel is rinsed and left slightly moist
    (this multiple choice question has been scrambled)
  15. when bonding composite resin to metal that is exposed after the overlying porcelain has fractured which one of the following is FALSE?
    A. a opaque resin is applied before the composite resin to mask the metal and prevent a gray color from showing through the slightly translucent composite resin
    B. bonding agents are not needed because the composite resin sticks to the metal
    C. retention of the metal is enhanced by roughening the surface with a coarse diamond bur, by sandblasting, by electrochemically etching or by tin plating
    D. light curing materials can be used
    B. bonding agents are not needed because the composite resin sticks to the metal
    (this multiple choice question has been scrambled)

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