Effect of a new salivary-contaminant removal method on bond strength

Self-Instruction Exercise No. 386
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Exercise No. 386
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, Effect of a new salivary-contaminant removal method on bond strength, on pages 51-54. This exercise was developed by Riki Gottlieb, DMD, MS, FAGD, in association with the General Dentistry Self-Instruction committee.

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

  • describe different salivary-contaminant removal methods from glass ceramic restorations (GCRs);
  • compare the shear bond strength values of resin cement to GCRs based on surface treatment; and
  • determine the preferred clinical technique for salivary-contaminant removal from GCRs.

Answers for this exercise must be received by April 30, 2017.
  1. Why is hydrofluoric acid used to decontaminate GCRs?

    A. It maintains the collagen fiber structure when applied to dentin.
    B. It decreases the shear bond strength of the cement.
    C. It eliminates the need for a coupling agent.
    D. It creates porosities in the glass ceramic material.

  2. The coupling agent binds to the silica of the ceramic material and to the __________ group of the adhesive resin.

    A. aldehyde
    B. methacrylate
    C. phosphate
    D. fluoromethane

  3. What is the most common acid used by commercial dental laboratories to etch the intaglio surface of a GCR prior to sending the restoration to a dentist?

    A. boric
    B. phosphoric
    C. hyaluronic
    D. hydrofluoric

  4. Saliva causes all of the following reactions except one. Which is the exception?

    A. contaminates the restoration
    B. changes the bond strength
    C. allows easier washing of the internal surface
    D. deposits organic coating on the restoration

  5. The active components in Ivoclean are ___________ particles.

    A. zirconia oxide
    B. alumina oxide
    C. zinc oxide
    D. silicon dioxide

  6. How many specimens were used in the study?

    A. 50
    B. 100
    C. 150
    D. 200

  7. There were ____ experimental groups in the study.

    A. 5
    B. 10
    C. 15
    D. 20

  8. What was the lowest irradiance (in milliwatts) of the curing light used in the study?

    A. 600
    B. 800
    C. 1000
    D. 1200

  9. The specimens were stored at 37°C in ________ in a laboratory oven for 24 hours.

    A. saliva
    B. distilled water
    C. calcium hydroxide
    D. sodium bicarbonate

  10. The most effective surface treatment resulted in a mean bond strength of _____ MPa.

    A. 25.4
    B. 28.7
    C. 29.7
    D. 30.1

  11. Which protocol is the least effective surface treatment?

    A. HF acid, rinse/dry, silane, saliva, rinse/dry, silane, cement
    B. HF acid, rinse/dry, saliva, rinse/dry, silane, cement
    C. HF acid, rinse/dry, saliva, silane, cement
    D. HF acid, rinse/dry, silane, cement

  12. Test group ____ presented the greatest percentage of cohesive failures.

    A. 7
    B. 8
    C. 9
    D. 10

  13. Failure modes of the resin cement–lithium disilicate ceramic interface were listed as adhesive or cohesive fractures. An adhesive fracture may be observed as a fracture in GCRs.

    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. _______ values of adhesive fracture correlate with ______ bond strength.

    A. Lower; stronger
    B. Higher; weaker
    C. Lower; weaker
    D. Higher; stronger

  15. No significant differences in the shear bond strength of resin cement to lithium disilicate ceramic were found based on the type of cleaning procedure. The article concludes that etching of the pre-etched glass ceramic surface after contamination is not necessary.

    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.

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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Did this article present new information? Yes No
How much time did it take you to complete this exercise? mins

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