Microtensile bond strength of etch-and-rinse and self-etch adhesives to artificially created carious dentin

Self-Instruction Exercise No. 351
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Exercise No. 351
Subject Code: 257
Caries Detection and Prevention

The 15 questions for this exercise are based on the article, Microtensile bond strength of etch-and-rinse and self-etch adhesives to artificially created carious dentin, on pages 56-61. This exercise was developed by Gustav Gates, DDS, MAGD, in association with the General Dentistry Self-Instruction committee.

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

  • understand the differences between sound dentin, caries-affected dentin (CAD) and caries-infected dentin (CID);
  • understand how different adhesive systems bond to different types of dentin; and
  • compare the bond strengths of 2 different adhesive systems to CAD and CID.

Answers for this exercise must be received by April 30, 2015.
  1. Carious dentin consists of an outer layer of CAD. There is an inner layer of CID.

    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.

  2. The primary goal in the excavation of carious dentin is to remove only the ____________ layer.

    A. outer infected
    B. inner infected
    C. outer affected
    D. inner affected

  3. CAD has all of the following characteristics except one. Which is the exception?

    A. bacteria-free
    B. remineralizable
    C. hard surface
    D. soft surface

  4. CAD specimens were subjected to _____ demineralization cycles for _____ hours per cycle.

    A. 8; 3
    B. 6; 4
    C. 4; 2
    D. 2; 5

  5. The CID specimens were remineralized for _____ hours per cycle.

    A. 45
    B. 36
    C. 22
    D. 15

  6. The CAD specimens were immersed in a hyper-remineralization solution for _____ hours per cycle.

    A. 45
    B. 36
    C. 22
    D. 15

  7. Which solution was only renewed after the fourth cycle?

    A. CID demineralization solution
    B. CID remineralization solution
    C. CAD demineralization solution
    D. CAD hyper-remineralization solution

  8. The adhesive system was a significant factor in the bond strength. The type of dentin did not affect 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.

  9. The etch-and-rinse adhesive in sound dentin had a predominately adhesive failure mode of _____%.

    A. 67
    B. 42
    C. 33
    D. 31

  10. The percent of mixed failure by a self-etching system in CAD was _____.

    A. 59
    B. 50
    C. 42
    D. 38

  11. The etch-and-rinse adhesive system formed a _____ µm-thick hybrid layer in sound dentin.

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

  12. CID specimens were subjected to _____ demineralization cycles for _____ hours per cycle.

    A. 8; 3
    B. 6; 4
    C. 4; 2
    D. 2; 5

  13. Thick and irregular hybrid layers were produced in CID because of all the following except one. Which is the exception?

    A. collapsed resin tags
    B. poor adhesive resin penetration
    C. over-etching by conditioning agents
    D. resin-dentin interdiffusion zone

  14. A solution of _____ ppm sodium fluoride was used in the demineralization solution.

    A. 1
    B. 4
    C. 7
    D. 10

  15. Lower KHN numbers in CID and CAD can be attributed to all the following except one. Which is the exception?

    A. smaller apatite crystals
    B. lower cohesive strength
    C. disorganized collagen matrix
    D. mineral filled tubules

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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