Influence of irrigation protocols on the bond strength of fiber posts cemented with a self-adhesive luting agent 24 hours after endodontic treatment

Self-Instruction Exercise No. 370
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Exercise No. 370
Subject Code: 250
Operative (Restorative) Dentistry

The 15 questions for this exercise are based on the article, Influence of irrigation protocols on the bond strength of fiber posts cemented with a self-adhesive luting agent 24 hours after endodontic treatment, on pages 22-26. 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 effects of various endodontic irrigants on bonding of fiber posts to dentin;
  • understand the effect of post space preparation in relation to various endodontic irrigants; and
  • coordinate endodontic and restorative treatment of coronally challenged teeth.

Answers for this exercise must be received by June 30, 2016.
  1. The use of prefabricated fiber posts has all of the following advantages over cast posts except one. Which is the exception?

    A. less clinical chair time
    B. easier installation
    C. increased risk of fluid infiltration into canal system
    D. superior mechanical properties

  2. All of the following are variables that may influence the quality of post-cement-dentin interfaces except one. Which is the exception?

    A. type of etching agent
    B. endodontic auxiliary chemical substances
    C. chemical and physical properties of  the post
    D. diameter of the post space

  3. ________________is a commonly used irrigant in endodontic treatment that has been reported to impair the bond strength of adhesive systems to root dentin.

    A. Sodium hypochlorite  (NaOCl)
    B. Chlorhexidine (CHX)
    C. Ethylenediaminetetraacetic acid
    D. Sterile saline

  4. How many bovine incisors were used in the study?

    A. 46
    B. 56
    C. 66
    D. 76

  5. How many groups, including control, were tested in the study?

    A. 4
    B. 5
    C. 6
    D. 7

  6. Which endodontic technique was used to prepare the root canals?

    A. step-back
    B. rotary nickel-titanium system
    C. reciprocation
    D. crown-down

  7. Sterile saline was used as an irrigant with _____ groups.

    A. 4
    B. 5
    C. 6
    D. 7

  8. A ____________ cement was used to cement the fiber posts.

    A. self-adhesive resin
    B. zinc phosphate
    C. polycarboxylate
    D. resin-modified glass ionomer

  9. All of the following were listed as modes of failure except one. Which is the exception?

    A. post fracture
    B. mixed failure of >50% dentin-cement
    C. post-cement interface failure
    D. dentin-cement interface failure

  10. Slices, _____ mm in thickness, were sectioned from 3 regions of the roots.

    A. 1
    B. 3
    C. 5
    D. 9

  11. The apical slice was taken _____ mm along the length of the root.

    A. 3
    B. 5
    C. 9
    D. 12

  12. Failure mode type _______ was found to be most prevalent.

    A. I
    B. II
    C. III
    D. IV

  13. The null hypothesis of this study was rejected. The groups presented similar values for bond strength independent of irrigation protocol and root depth.

    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.

  14. Some studies have shown irrigation with NaOCl increased bond strength to dentin. Other studies have shown CHX irrigation results in the lowest bond strength.

    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.

  15. The authors speculate that the ________________ may be responsible for the results of this study that seem to contradict others.

    A. interaction of carboxyl functional groups with the hydroxyapatite
    B. mechanical removal of dentin during post space preparation
    C. thickness of the slice taken for testing
    D. inability to observe the hybrid layer, even under high magnification

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
 
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