Antimicrobial effect of three new and two established root canal irrigation solutions

Self Instruction Exercise No. 318
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Exercise No. 318
Subject Code: 070
Endodontics

The 15 questions for this exercise are based on the article Antimicrobial effect of three new and two established root canal irrigation solutions on pages 534-537. This exercise was developed by Merlin Ohmer, DDS, FAGD, in association with the General Dentistry Self-Instruction committee.

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

  • understand the efficacy of various root canal irrigants;
  • decide which irrigant to use in clinical practice; and
  • understand the various root canal irrigants available for use.

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

  1. Which of the following irrigants has been shown to have residual antibacterial activity for up to four weeks?

    A. MTAD
    B. Hypoclean
    C. Chlor-XTRA
    D. Tetraclean

  2. 1.3% Sodium hypochlorite (NaOCl) is the least effective antimicrobial agent against

    A. A. israelii.
    B. E. faecalis.
    C. L. casei.
    D. C. albicans.

  3. The root canal system is easily cleaned and disinfected with thorough instrumentation. Disinfection is easy to accomplish.

    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.

  4. Actinomyces have all of the following characteristics except one. Which is the exception?

    A. Non-motile
    B. Non-spore forming
    C. Acid-fast
    D. Rod-shaped

  5. The most commonly used root canal irrigant is

    A. sodium hypochlorite.
    B. CHX.
    C. Tetraclean.
    D. Hypoclean.

  6. CHX’s action is thought to be

    A. penetration of the cell wall.
    B. destruction of the cell wall.
    C. allowing extra-cellular material into the cell.
    D. allowing intra-cellular material out of the cell.

  7. CHX is a more effective irrigant than sodium hypochlorite. It is effective against fungi.

    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. Tetraclean is a commercial irrigant that contains which of the following ingredients?

    A. Tetracycline
    B. Minocycline
    C. Doxycycline
    D. Chlortetracycline

  9. Specifically, how long were the agar plates incubated?

    A. 12 hours
    B. 24 hours
    C. 48 hours
    D. 72 hours

  10. Which irrigant ingredient was the most effective antimicrobial agent?

    A. CHX
    B. Sodium hypochlorite
    C. Antibiotic
    D. Detergent

  11. The agar diffusion test measures

    A. the spread of bacteria in a culture medium.
    B. the depth of penetration of bacteria into the tissue.
    C. the effectiveness of an antimicrobial.
    D. the virulence of a bacteria.

  12. The agar diffusion test is very easy to conduct. It has very few, if any, disadvantages.

    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. The Neglia et al study found Tetraclean to be at least as effective as

    A. sodium hypochlorite.
    B. CHX.
    C. Hypoclean.
    D. Chlor-XTRA.

  14. 5.25% Sodium hypochlorite and _______________ were found to be the most effective irrigants.

    A. CHX
    B. Hypoclean
    C. Tetraclean
    D. Chlor-XTRA

  15. In the study, which material demonstrated the greatest residual anti-microbial activity?

    A. Sodium hypochlorite
    B. Hypoclean
    C. Tetraclean
    D. CHX


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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