Starting December 1, 2018, the Self-Instruction program will be exclusively available online. We will still publish Self-Instruction (S-I) exercises at the end of every corresponding General Dentistry article, but now you can pay online, test online, and receive your continuing education (CE) verification online. Earning CE has never been easier. 

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If you have any questions, or if you are unsure of your enrollment status, please call the Manager, Examinations and Self-Instruction, toll-free at 888.243.3368, ext. 4336.

Participants must answer at least 12 of 15 questions correctly (80%) to earn CE credit.

AGD - Self-Instruction Exercise No. 409 - Fixed Prosthodontics
Review of techniques for the intact removal of a permanently cemented restoration

Self-Instruction Exercise No. 409
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Exercise No. 409
Subject Code: 610
Fixed Prosthodontics

The 15 questions for this exercise are based on the article, Review of techniques for the intact removal of a permanently cemented restoration on pages 48-53. This exercise was developed by Thomas Boyle, DMD, MAGD, ABGD, in association with the General Dentistry Self-Instruction committee.

Reading the article and successfully completing this exercise will enable you to:

  • understand the various techniques and instruments available to remove cemented restorations;
  • recognize the advantages and limitations of each method; and
  • categorize the existing systems to facilitate selection for specific clinical situations.

Answers for this exercise must be received by August 31, 2018.

  1. The safest, least traumatic means of removing cemented restorations is ___________.

    A. an ultrasonic crown tractor
    B. the slot and pry technique
    C. Richwil resin
    D. the reverse tapper technique

  2. All of the following are reasons to remove a permanently cemented restoration except one. Which is the exception?

    A. secondary caries
    B. chipped porcelain
    C. cold sensitivity
    D. patient shade preference

  3. According to dental insurance companies, the life span of a crown is _____ years.

    A. 5-6
    B. 7-8
    C. 9-10
    D. 11-12

  4. Which factor affects the intact and safe removal of a crown or fixed partial denture?

    A. patient health
    B. pulp health
    C. caries rate
    D. number of teeth remaining

  5. What type of analysis was used to systematically review the literature?

    A. regression
    B. content-based
    C. pooled data
    D. quantitative

  6. The correct use of back-action hammers involves application of force __________.

    A. against bridge abutments to exert torque
    B. to nonmarginal crown areas
    C. with maximal power
    D. along the long axis

  7. Spring-loaded back-action instruments include all the following except one. Which is the exception?

    A. manual
    B. semiautomatic
    C. automatic
    D. ratchet

  8. The CORONAflex crown remover delivers long, slow blows. Manual crown and bridge removers deliver short, sharp impact force.

    A. Both statements are true
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  9. An advantage of the resin coping technique is that ______________.

    A. heavier forces can be applied
    B. undercuts are not necessary
    C. accidental sliding is lessened
    D. no modifications are needed

  10. All of the following are considerations during use of the Richwil crown remover except one. Which is the exception?

    A. aspiration potential
    B. inadvertent tooth removal
    C. use limited to temporary restorations
    D. success rate of 60%

  11. The Richwil crown and bridge remover__________________.

    A. is a light-cured resin
    B. is a thermoplastic resin
    C. has weak adhesive properties
    D. is a resin-modified glass ionomer

  12. An ultrasonic manufacturer cautions that its device will not work on castings cemented with _____________.

    A. zinc phosphate cement
    B. zinc polycarboxylate cement
    C. MaxCem
    D. resin cement

  13. The Metalift system breaks the cement seal with a ______________ force.

    A. jacking
    B. compressive
    C. vibrational
    D. torquing

  14. A twisting force is used with the __________.

    A. Higa system
    B. buccolingual dimple technique
    C. WAMkey system
    D. Metalift technique

  15. Since 2000, the incidence of abutment screw loosening beneath cemented implant crowns has _____________.

    A. increased
    B. decreased
    C. remained constant
    D. ceased to be a concern


Please respond to the statements below, using the following scale:
1 Poor; 2 Below average; 3 Average; 4 Above average; 5 Excellent

Practicality of the content 1 2 3 4 5
Benefit to your clinical practice 1 2 3 4 5
Quality of illustrations 1 2 3 4 5
Clarity of objectives 1 2 3 4 5
Clarity of exercise questions 1 2 3 4 5
Relevance of exercise questions 1 2 3 4 5
Did this exercise achieve its objectives? Yes No
Did this article present new information? Yes No
How much time did it take you to complete this exercise? mins