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. 422 - Endodontics
Bioactive endodontic materials for everyday use: a review

Self-Instruction Exercise No. 422
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Exercise No. 422
Subject Code: 070

The 15 questions for this exercise are based on the article Bioactive endodontic materials for everyday use: a review on pages 48-51.This exercise was developed by Thomas J. 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 bioactivity of various mineral trioxide aggregate (MTA)–type endodontic products;
  • appreciate the clinical effects of a product’s components; and
  • choose products based on their handling, color stability, particle size, and cost.

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

  1. To be considered bioactive, a material must form which of the following?

    A. H+ ions
    B. PO4- ions
    C. apatite
    D. synthetic fluid

  2. ProRoot MTA is an industry standard due to its ___________.

    A. handling
    B. setting time
    C. lack of discoloration
    D. long history

  3. Original formulations of tricalcium silicate material can be used for all of the following except one. Which is the exception?

    A. perforations
    B. pulpotomies
    C. root-end fills
    D. access fills

  4. Which material uses a powder-water mixing technique?

    A. Biodentine
    B. DiaRoot
    C. EndoSequence BC Sealer
    D. OrthoMTA

  5. What is an advantage of spatula-mixed materials?

    A. better handling
    B. reduced staining
    C. mix size
    D. setting-time control

  6. The advantages of unit-dose capsules include all of the following except one. Which is the exception?

    A. available in centrifuge type
    B. available in trituration type
    C. mix waste is reduced
    D. mix uniformity

  7. Small particle size of the bioceramic material allows tubule penetration. Particle size of the bioceramic material has no effect on setting properties.

    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.

  8. In which use is bioceramic particle size most important?

    A. root-end filling
    B. perforation repair
    C. endodontic sealing
    D. gutta percha compatibility

  9. Tubule penetration is improved with ________________.

    A. smaller particle size
    B. single-cone use
    C. continuous-wave
    D. vertical condensation

  10. Nanoparticle modification of ProRoot MTA reduces __________.

    A. pH
    B. acidity
    C. calcium release
    D. bioactivity

  11. EndoSequence products cost more per gram than other materials because ____________.

    A. they have 100% nanoparticles
    B. smaller particles are more expensive to produce
    C. bismuth radiopacifier is costlier
    D. high Ca++ release is clinically more effective

  12. All of the following are associated with discoloration except one. Which is the exception?

    A. coronal application
    B. lower iron content
    C. immature teeth
    D. white MTA

  13. Which material causes less staining after exposure to hypochlorite or chlorhexidine?

    A. MTA Plus
    B. ProRoot MTA
    C. MTA Angelus
    D. EndoSequence BC Sealer

  14. Which of the following radiopacifiers would be most likely to cause tooth staining?

    A. zirconia
    B. tantalum
    C. bismuth
    D. calcium

  15. It has been theorized that the lack of color stability of products in the presence of blood can be attributed to which factor?

    A. the radiopacifier
    B. erythrocyte entrapment
    C. sodium hypochlorite
    D. product failure


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