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. 421 - Basic Science
Evaluation of the marginal integrity of a bioactive restorative material

Self-Instruction Exercise No. 421
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Exercise No. 421
Subject Code: 010
Basic Science

The 15 questions for this exercise are based on the article Evaluation of the marginal integrity of a bioactive restorative material on pages 32-36. This exercise was developed by Charles Martello, DDS, MAGD, in association with the General Dentistry Self-Instruction committee.

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

  • define bioactive restorative materials;
  • understand the role bioactive restorative materials maintain in prevention, remineralization, and restoration of active carious lesions; and
  • comprehend the relationship between marginal integrity and microleakage as it relates to restorative success.

Answers for this exercise must be received by April 30, 2019.

  1. The ultimate goal of a traditional composite restorative material is to __________.

    A. reproduce anatomy
    B. restore function
    C. imitate esthetics
    D. produce an interfacial seal

  2. The individual components of a bioactive restorative material demonstrate ___________.

    A. a hydrophobic ionic resin matrix
    B. a dynamic response to oral pH changes
    C. charged resin particles
    D. a diminished diffusion of ions

  3. The preparation bevel was accomplished with a No. ___________ bur.

    A. 56 carbide
    B. 56 diamond
    C. 257 carbide
    D. 257 diamond

  4. The tooth surfaces of each specimen were coated with 2 layers of nail varnish to ______________.

    A. increase degree of refractive index
    B. decrease fracture resistance
    C. secure existing restorations
    D. inhibit dye penetration

  5. Groups were eventually scored based on ___ readable surfaces.

    A. 17
    B. 20
    C. 34
    D. 40

  6. Microleakage is the clinically undetectable passage of bacteria, fluids, molecules, or ions between a cavity wall and the restorative material applied to it. Eventual sequelae include marginal discoloration, microgap formation, recurrent caries, possible pulpal involvement, and restoration replacement.

    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.

  7. What year did Hench et al first employ the bioactive relationship?

    A. 1969
    B. 1980
    C. 1991
    D. 2002

  8. Which dental material was introduced to induce healing and creation of new tooth structure?

    A. Ceramir Crown & Bridge
    B. Biodentine
    C. ABF
    D. Reactimer

  9. The manufacturer calls ACTIVA a smart material because it ___________________.

    A. is insensitive to variations in oral pH
    B. creates an insoluble hydrophobic ionic resin matrix
    C. includes bisphenol A to mimic natural tooth esthetics
    D. continuously recharges adjoining tooth structures

  10. ACTIVA accomplishes dual polymerization through its _________________.

    A. bioactive ionic matrix
    B. bis-GMA complex
    C. hydrophobic nature
    D. bisphenol derivatives

  11. All of the following result in a less efficacious process except one. Which is the exception?

    A. marginal breach
    B. dye penetration
    C. micromechanical adhesion
    D. microleakage

  12. Cannavo et al revealed that ACTIVA exhibited significant microleakage at the cervical margins. Their study also revealed that ACTIVA with a bonding agent “compared favorably” to conventional composite resins using bonding agents.

    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.

  13. Which study type is the best projector of restoration performance?

    A. in vitro toxicology
    B. preclinical microleakage
    C. in vivo longitudinal
    D. nonclinical bioactive absorption

  14. What is the most significant factor in microleakage of composite resin restorative systems?

    A. dentate ion concentration
    B. tooth surface morphology
    C. continuous systemic remineralization
    D. bioactive recharging technology

  15. What is the primary factor affecting marginal microleakage?

    A. clinical aptitude
    B. restorative system
    C. bonding surfaces
    D. material methodology


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