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Fabrication of Provisional Crowns and Bridges

Cynthia M. Cleveland, CDA; Angela D. Allen; Niki Henson, RDA, AS

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  1. The indirect technique is preferred _______________.

    • for cost effectiveness
    • for efficient use of time
    • for pulpal protection
    • because of a low shrinkage rate
  2. Light activated materials should be _______________.

    • stored in a warm room
    • stored in a dark container
    • mixed well
    • fluid in consistency
  3. A good provisional should provide _______________.

    • stability
    • provide occlusal function
    • promote temperature changes
    • Both A and B
  4. Margins that are impinging on the gingival tissue can cause inflammation, resulting in _______________.

    • gingival recession
    • hemorrhage
    • hypertrophy
    • All of the above.
  5. Exothermic reaction increases when _______________.

    • used with increasing amounts of acrylic
    • using light cured materials
    • working time is increased
    • the final set has occurred
  6. Provisional materials include __________ cured.

    • chemically
    • light
    • dual
    • All of the above.
  7. When determining your margins, you should _______________.

    • start trimming right away
    • take a lead pencil and outline your margins
    • look for bubbles or discrepancies in the provisional
    • allow the material to set completely
  8. When polishing with a lathe, make sure _______________.

    • a sterile rag wheel is used
    • the protective shield is down
    • PPE is worn
    • All of the above.
  9. The switch(es) left on during the “suck down” stage when using a vacuum former is(are) the ____________.

    • heat switch
    • vacuum switch
    • Both A and B
    • None of the above.
  10. Pre-Fabricated Light-cured Composite Crowns are complicated to fabricate. Prefabricated Light cured Composite Crowns need an impression and matrix for fabrication.

    • The first statement is true.  The second statement is false.
    • The first statement is false.  The second statement is true.
    • Both statements are true.
    • Both statements are false.
  11. Dental assistants should _______________.

    • choose their own materials and techniques
    • consult the doctor when choosing materials and techniques
    • not talk to the patient during the procedure
    • not worry about the characteristics of materials
  12. Post operative instructions should include _______________.

    • telling the patient to floss regularly
    • instructing patient to snap the floss through the contacts
    • not to change diet
    • not to brush area involved
  13. The setting time for the stone mixed with slurry water should take approximately ____________.

    • 10 minutes
    • 3 minutes
    • 2 minutes
    • 5 minutes
  14. Bis-acrylic materials are popular because there is _______________.

    • minimal odor
    • easy manipulation
    • minimal shrinkage during polymerization
    • All of the above.
  15. An explorer is used to _______________.

    • remove air bubbles from the template during the pouring of acrylic
    • remove the template off the model
    • mix the acrylic
    • Both A and C
  16. During the try on stage, you should _______________.

    • be concerned if you break the preparations off the model
    • be concerned if the provisional does not seat properly
    • force the provisional in place
    • cement the crown
  17. A provisional may remain in the oral cavity for _______________.

    • two to four weeks
    • two weeks to eighteen months
    • four weeks to one year
    • two years
  18. When using the indirect technique, a vacuum formed matrix must _______________.

    • be trimmed along the margin
    • fit exactly on the model of the prepared teeth
    • rest on the frenum
    • include three or more teeth mesially and distally
  19. The bur that would not be used in trimming a provisional bridge is the ____________.

    • #330
    • #35 acrylic bur
    • #8 round bur
    • diamond disc
  20. Diamond discs are used for _______________.

    • trimming the margins of the provisional
    • placing anatomy on the occlusal portion of the provisional
    • separating the teeth of the provisional
    • polishing the provisional
  21. Bis-acrylic materials _______________.

    • produce extreme heat during polymerizing
    • are cost effective
    • have a wide range of shades
    • produce minimal heat when polymerizing
  22. The pressure pot should be pressurized to _____ p.s.i.

    • 32
    • 20
    • 10
    • 5
  23. Traditional acrylics _______________.

    • are affected by eugenol
    • have a 7% shrinkage rate
    • produce an exothermic reaction
    • All of the above.
  24. Polishing is important because _______________.

    • it allows for ease of cleaning of the provisional
    • it aids in placement of the provisional
    • a non-polished provisional would be rough
    • Both A and C
  25. Traditional acrylic resins are also known as _______________.

    • polyethyl methacrylate
    • polymethyl methacrylate
    • monomer and polymer
    • All of the above.
  26. A provisional crown or bridge is also called a/an _______________.

    • temporary restoration
    • immediate restoration
    • interim restoration
    • Both A and C
  27. A long span and long term provisional bridge should be _______________.

    • cemented permanently
    • reinforced with metal or mesh
    • removed periodically
    • None of the above.
  28. Esthetics is considered one of the five basic purposes for a provisional.  Prefabricated provisionals should only be used in the posterior.

    • The first statement is true.  The second statement is false.
    • The first statement is false.  The second statement is true.
    • Both statements are true.
    • Both statements are false.
  29. When cementing the provisional _______________.

    • it is not necessary to floss
    • you should not dry the teeth
    • use a plastic instrument to remove cement
    • instruct the patient to bite down
  30. Bis-acrylics are _______________.

    • composite fillers
    • diamethacrylates
    • BIS-GMA
    • All of the above.





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