Effect of prolonged air drying on the bond strength of adhesive systems to dentin

Self-Instruction Exercise No. 377
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Exercise No. 377
Subject Code: 250
Operative (Restorative) Dentistry

The 15 questions for this exercise are based on the article, Effect of prolonged air drying on the bond strength of adhesive systems to dentin, on pages 68-72. This exercise was developed by Kim Capehart, DDS, MBA, PhD(c), in association with the General Dentistry Self-Instruction committee.

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

  • identify the characteristics of adhesive systems;
  • identify the factors that contribute to high bond strength; and
  • recognize the effects of prolonged air-drying time on adhesive systems.

Answers for this exercise must be received by October 31, 2016.
  1. Hydrophilic solvents serve as a vehicle to _________ water from substrate in _________ dentin.

    A. remove; wet
    B. add; wet
    C. remove; dry
    D. add; dry

  2. Air drying is considered the most simple and effective method to achieve solvent evaporation. This effect is independent of the type of solvent.

    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.

  3. Acetone and ____________ are common solvents added to adhesive systems.

    A. methanol
    B. xylitol
    C. ethanol
    D. propranolol

  4. The effect of air drying on degree of evaporation was evaluated by a gravimetric method measuring  ______________ loss.

    A. weight
    B. height
    C. mineral
    D. photofluorescence

  5. Dentin bond strength was measured by __________ bond strength.

    A. nanotensile
    B. millitensile
    C. megatensile
    D. microtensile

  6. Air drying was performed at a ____-cm distance.

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

  7. The flat dentin surfaces of the sectioned third molars were sandpapered for _____ seconds to standardize the smear layer.

    A. 40
    B. 50
    C. 60
    D. 70

  8. The presence of residual solvents prior to light curing can reduce ___________ properties of the adhesive layer.

    A. physical
    B. chemical
    C. mechanical
    D. metaphysical

  9. For OptiBond Solo, the manufacturer’s instructions advise acid etching for 15 seconds, then rinsing for _____ seconds.

    A. 10
    B. 15
    C. 20
    D. 25

  10. Bond strength values were calculated in _____________.

    A. decipascals (dPa)
    B. megapascals (MPa)
    C. millipascals (mPa)
    D. nanopascals (nPa)

  11. The correlation between microtensile bond strength and degree of conversion was determined by the _________________ test.

    A. Kendall τ rank correlation coefficient
    B. distance correlation
    C. Cronbach α
    D. Spearman

  12. Which bonding agent exhibited the highest degree of evaporation by the air drying technique?

    A. Adper Single Bond 2
    B. Prime & Bond 2.1
    C. OptiBond Solo
    D. XP Bond

  13. Higher bond strength values obtained after prolonged air drying were statistically significant only for ____________ and ____________.

    A. XP Bond; Adper Easy One
    B. Adper Single Bond 2; XP Bond
    C. Prime & Bond 2.1; Adper Easy One
    D. XP Bond; OptiBond Solo

  14. The effectiveness of increasing air-drying time to improve solvent evaporation is material dependent due to differences in composition. One-step self-etching systems seem to be more sensitive to variations in the duration of airflow.

    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. All of the following components influence solvent evaporation except one. Which is the exception?

    A. fillers
    B. initiators
    C. comonomers
    D. copolymers

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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