Antibacterial activity in adhesive dentistry: A literature review

Self Instruction Exercise No. 319
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Exercise No. 319
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article Antibacterial activity in adhesive dentistry: A literature review on pages e346-e356. This exercise was developed by Gustav Gates, DDS, MAGD, in association with the General Dentistry Self-Instruction committee.

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

  • describe different types of antibacterial agents used in adhesive dentistry;
  • understand the clinical applications and beneficial effects of antibacterial agents;
  • understand the clinical effects of antibacterial agents in various bonding situations; and
  • describe the difference between the two main categories of antibacterial agents.

Answers for this exercise must be received by October 31, 2013.

  1. Residual bacteria under restorations have been found to survive and proliferate for more than ____ months.

    A. 6
    B. 12
    C. 18
    D. 24

  2. Plaque accumulation on the composite surface is less than that on an enamel surface. This leads to fewer microorganisms around the potential microgap.

    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.

  3. The antibacterial property of self-etching adhesive was short-lived and less effective

    A. because the self-etching adhesive was photocured.
    B. because some bacteria are acid resistant.
    C. due to the buffering capacity of the dentin.
    D. due to a limited amount of application time.

  4. Materials that have been used to disinfect the cavity preparation prior to placing the restoration include all of the following except one. Which is the exception?

    A. Tubulicid
    B. Alcohol
    C. Hydrogen peroxide
    D. Eugenol

  5. Chlorhexidine gluconate (CHX) has been used for years as a safe antiseptic because of all of the following properties except one. Which is the exception?

    A. Site-specific action
    B. Bacteriostatic at low concentrations
    C. Bacteriocidal at high concentrations
    D. Effect on gram-positive bacteria

  6. The antibacterial effect of CHX is attributed to its

    A. cationic activity.
    B. low pH.
    C. high alcohol content.
    D. high solubility in saliva.

  7. CHX can lead to longer lasting antimicrobial substantivity compared to other disinfectants. This period of time can be from 48 hours to ____ weeks.

    A. 6
    B. 8
    C. 10
    D. 12

  8. Most authors and manufacturers of commercial products recommend the use of CHX as a cavity disinfectant for _____ seconds after etching.

    A. 30
    B. 40
    C. 50
    D. 60

  9. The percentage of CHX in commercially available products for cavity disinfection is ___%.

    A. 1
    B. 2
    C. 3
    D. 4

  10. Fluoride has been incorporated into restorative materials for its antibacterial effect on S. mutans. Another beneficial effect is the inhibition of demineralization of the surrounding tooth structure.

    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.

  11. What is the correct range of prevalence of demineralization around fixed orthodontic appliances?

    A. 10 - 30%
    B. 40 - 60%
    C. 50 - 70%
    D. 70 - 90%

  12. The adverse effect of a 2% solution of CHX on self-etch adhesives was related to which of the following?

    A. High alcohol content
    B. Residual moisture
    C. Depth of penetration
    D. Removal of smear layer

  13. Antibacterial agents that have been used to prevent demineralization around orthodontic appliances include all of the following except one. Which is the exception?

    A. Methacryloyloxy dodecylpyridinium bromide
    B. Silver nanoparticles
    C. Benzalkonium chloride
    D. Cetylpyridinium chloride

  14. Using One Step Plus as the adhesive in a restorative procedure with CHX as a cavity disinfectant, one would expect the effect on the bond strength to be a

    A. negative effect on etch-and-rinse.
    B. negative effect on self-etch.
    C. positive effect on self-etch.
    D. positive effect on etch-and-rinse.

  15. CHX gel as a cavity disinfectant had a negative effect on the enamel bond strength of Transbond XT. The enamel bond improved when the CHX was applied before etching.

    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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