Bond strength of silorane- and methacrylate-based composites to resin-modified glass ionomers

Self-Instruction Exercise No. 342
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Exercise No. 342
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, Bond strength of silorane- and methacrylate-based composites to resin-modified glass ionomers, on pages 73-78. This exercise was developed by Steven E. Holbrook, DMD, MAGD, in association with the General Dentistry Self-Instruction committee.

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

  • identify the advantages and disadvantages of silorane-based composite resins, methacrylate-based composite resins, and resin-modified glass ionomers; and
  • understand the rationale for the sandwich technique.

Answers for this exercise must be received by October 31, 2014.
  1. The foremost shortcoming of methacrylate-based composite resin is

    A. polymerization shrinkage.
    B. color stability.
    C. wear resistance.
    D. handling characteristics.

  2. The sandwich technique utilizes which of the following to overcome polymerization shrinkage?

    A. incremental composite layering and curing
    B. glass ionomer at the occlusal margin
    C. glass ionomer at the gingival margin
    D. bulk placement of composite resin

  3. Resin-modified glass ionomers improved the sandwich technique due to the material’s greater

    A. wear resistance.
    B. bond strength.
    C. fluoride release.
    D. tensile strength.

  4. The distinct advantage of silorane-based over methacrylate-based composite resin is

    A. bond strength to dentin.
    B. less polymerization shrinkage.
    C. better marginal integrity.
    D. less microleakage.

  5. Failure in the adhesive layer with silorane-based composite resin occurred _____% of the time regardless of adhesive or surface treatment.

    A. 22
    B. 44
    C. 68
    D. 90

  6. The samples in the methacrylate-based composite resin group exhibited failures more __________ in nature with __________ standard deviations.

    A. adhesive; smaller
    B. cohesive; smaller
    C. cohesive; larger
    D. adhesive; larger

  7. Which of the following characteristics do the two bonding agents have in common?

    A. one-step application
    B. pH
    C. phosphoric acid etchant
    D. methacrylate-based monomers

  8. Polymerization stress can overcome the weaker bond of methacrylate-based composites to dentin compared to enamel. Shrinkage and gap formation is thought to be a major cause of failure of methacrylate-based composite restorations.

    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 silorane monomer provides a chemical bond to the silorane-based composite resin by initiating the

    A. action of 10-methacryloyloxydecl dihydrogen phosphate.
    B. hybridization of the demineralized layer.
    C. decomposition of azobisisobutyronitrile.
    D. ring-opening cationic cure.

  10. The failures of the methacrylate-based composite resin occurred almost exclusively

    A. at the dentinal adhesive interphase.
    B. at the enamel adhesive interphase.
    C. within the methacrylate based composite material.
    D. within the resin-modified glass ionomer material.

  11. A significant difference was found in bond strength based on composite.A significant difference was found in bond strength based on surface treatment.

    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.

  12. The greatest bond strengths to resin-modified glass ionomer were produced using __________ adhesive agent with __________-based composite resin.

    A. silorane; methacrylate
    B. silorane; silorane
    C. methacrylate; silorane
    D. methacrylate; methacrylate

  13. The average methacrylate-based composite resin restorative material shrinks approximately _____%.

    A. 0.5
    B. 1
    C. 2
    D. 3

  14. Which of the following needs to be done to bond composite resin to conventional glass ionomer?

    A. nothing
    B. coat glass ionomer with unfilled resin
    C. roughen the surface of the glass ionomer
    D. remove the oxygen inhibited layer from the glass ionomer

  15. Which of the following null hypotheses was confirmed by the study?

    A. No significant differences in bond strength to resin modified glass ionomer based on type of composite.
    B. No significant differences in bond strength to resin modified glass ionomer based on type of adhesive.
    C. No significant differences in bond strength to resin-modified glass ionomer based on surface preparation.
    D. No significant differences in bond strength to resin-modified glass ionomer based on type of dentinal 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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