Effect of thermocycling and water storage on bond longevity of two self-etch adhesives

Self-Instruction Exercise No. 329
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Exercise No. 329
Subject Code: 250
Operative (Restorative) Dentistry

The 15 questions of this exercise are based on the article, “Effect of thermocycling and water storage on bond longevity of two self-etch adhesives”, on pages 39-44. This exercise was developed by Daniel S. Geare, DMD, in association with the General Dentistry Self-Instruction committee.

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

  • the mechanism of bonding in self-etch adhesive (SEA) systems;
  • the bond strength of 1-step and 2-step SEA systems;
  • the reasons for bond failure; and
  • the reasons for breakdown of the interface between tooth and restoration.

Answers for this exercise must be received by April 30, 2014.
  1. The ___________ is the weakest aspect of the tooth-colored restorations.

    A. resin-tooth interface
    B. bonding “lattice” of the composite
    C. resin matrix
    D. dentin bond

  2. According to the article, adhesive failures include all of the following except one. Which is the exception?

    A. loss of retention
    B. occlusal pitting
    C. marginal discoloration
    D. recurrent caries

  3. Most adhesive systems used today involve removing the smear layer or using the smear layer as bonding surface. SEAs are effective because they remove the smear layer automatically.

    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. Dentin requires adequate demineral-ization by etching for the bond to be effective. The leakage of SEAs is due to the inadequate etching of the etch-and-prime system.

    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.

  5. The bond strength of BeautiBond was influenced by all of the following except one. Which is the exception?

    A. high conversion rate
    B. water contamination
    C. low resin strength
    D. separation of the materials

  6. What is the big difference between 1-step and 2-step SEAs?

    A. 1-step SEAs are more acidic.
    B. 2-step SEAs are more hydrophilic.
    C. There is higher bond strength with the 1-step SEAs.
    D. One-step SEAs have higher initial bond strength.

  7. The primary reason for an SEA’s bond failure is

    A. inadequate resin penetration.
    B. continuous etching.
    C. under demineralization of the dentin.
    D. poor bonding with the composite.

  8. One reason that mild SEAs fail is because of the hybrid smear layer. The hybrid smear layer fails sooner in 1-step SEAs due to lower 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. Super dentin refers to

    A. highly permeable dentin.
    B. dentin resistant to debonding.
    C. reinforced dentin.
    D. dentin resistant to bonding.

  10. The strong, medium, and mild categories of SEAs refer to

    A. bond strength.
    B. permeability.
    C. acidity.
    D. hybrid layer.

  11. HEMA is effective because it

    A. connects dissimilar components.
    B. lowers water absorption.
    C. increases mechanical properties.
    D. enhances phase separation.

  12. HEMA-free adhesives

    A. provide a more predictable bond.
    B. potentially lower bond strength.
    C. make the bond more hydrophilic.
    D. make the tooth more sensitive.

  13. The bond strength and durability of the adhesive depend on

    A. the thickness of the hybrid layer.
    B. the morphology of the hybrid layer.
    C. the length of the resin tags.
    D. adequate penetration of the resin.

  14. Recent studies have shown that the dentin bonded interface can degrade in as little as

    A. 6 months.
    B. 9 months.
    C. 18 months.
    D. 3 years.

  15. The bond strength of the Clearfil Protect versus the BeautiBond groups showed that the

    A. enamel bond was significantly stronger in the BeautiBond groups.
    B. enamel bond was essentially equal.
    C. enamel bond of the Clearfil Protect groups was significantly stronger.
    D. the dentin bond strength was not a factor.

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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