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

Note: Exercise 994 is a special edition of the Self-Instruction Exercises and is only available to those members/nonmembers who attended the 2017 Scientific Session in Las Vegas. If you submit exercise 994 but did not attend the Scientific Session, the exercise will not be processed and your payment will be returned.

AGD - Self-Instruction Exercise No. 399 - Dental Materials
Chitosan incorporated in a total-etch adhesive system: antimicrobial activity against Streptococcus mutans and Lactobacillus casei

Self-Instruction Exercise No. 399
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Exercise No. 399
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article Chitosan incorporated in a total-etch adhesive system: antimicrobial activity against Streptococcus mutans and Lactobacillus casei on pages 62-66. This exercise was developed by Robert A. Busto, DMD, MBA, FAGD, in association with the General Dentistry Self-Instruction Committee.

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

  • understand the role of antibacterial additives in adhesive systems;
  • learn about chitosan as an adhesive system additive; and
  • recognize the impact of chitosan as an antibacterial additive in adhesive systems.

Answers for this exercise must be received by December 31, 2017.

  1. The increase of acidity produced by methacrylate polymers of adhesive systems leaves a zone rich in _________ within the hybrid layer.

    A. H2O
    B. Ca(OH)2
    C. H2O2
    D. CH4

  2. What is the best description of chitosan?

    A. natural biopolymer
    B. low-density polyethylene polymer
    C. acrylic polymer
    D. condensation polymer

  3. The antibacterial activity of chitosan is attributed to which mechanism?

    A. inhibition of protein synthesis
    B. alteration of the cell membrane
    C. disruption of nucleic acid synthesis
    D. antimetabolite activity

  4. As an adhesive additive, chitosan is superior to MDPB and DMAE-CB because it _____________.

    A. is bacteriostatic
    B. repairs DNA
    C. does not affect adhesive capacity
    D. releases fluoride

  5. The study used _______ teeth.

    A. 10
    B. 24
    C. 32
    D. 66

  6. How many cavities were prepared per tooth?

    A. 2
    B. 3
    C. 4
    D. 5

  7. What was the highest concentration of chitosan used?

    A. 0.02%
    B. 0.05%
    C. 0.20%
    D. 0.50%

  8. Statistical analysis was performed on __________.

    A. bacterial colony-forming units per milliliter
    B. bacterial colony size per millimeter
    C. bond strength to dentin per micrometer
    D. hybrid layer contamination per milliliter

  9. Light was applied for ____ seconds to activate the composite resin.

    A. 20
    B. 40
    C. 60
    D. 80

  10. Lactobacillus casei was incubated in _________ agar.

    A. mitis salivarius
    B. de Man, Rogosa, and Sharpe
    C. MacConkey
    D. blood

  11. There was no statistically significant difference among the Adper Single Bond 2 and chitosan groups. The Adper Single Bond 2 cavities showed a statistically significant difference from the negative control group.

    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.

  12. The adhesive Adper Single Bond 2 has an approximate pH of ___.

    A. 1.5
    B. 2.5
    C. 3.5
    D. 4.5

  13. All of the following are adhesive system properties that contributed to the results except one. Which is the exception?

    A. viscosity
    B. pH
    C. monomers of varying molecular weights
    D. curing light spectrum

  14. The experimental adhesive system containing chitosan contained ____ hydroxyethyl methacrylate (HEMA).

    A. 0.7%
    B. 27%
    C. 45%
    D. 55%

  15. The concentration of HEMA in Adper Single Bond 2 is not known. Resin materials that contain this monomer exhibit substantial antibacterial activity.

    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.


Evaluation

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


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