Properties of dual-cure, bulk-fill composite resin restorative materials

Self-Instruction Exercise No. 384
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Exercise No. 384
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, Properties of dual-cure, bulk-fill composite resin restorative materials, on pages 68-73. 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 the exercise will enable you to:

  • identify the characteristics of composite resins;
  • identify the various properties used to test traditional and new composites; and
  • recognize the benefits of self-cured and light-cured composites.

Answers for this exercise must be received by February 28, 2017.
  1. Bulk placement of traditional composite resin restorative materials resulted in poor polymerization in the ___________ aspects of the restoration.

    A. distal
    B. apical
    C. occlusal
    D. proximal

  2. The depth of cure was increased by all of the following except one. Which is the exception?

    A. greater translucency
    B. increased photoinitiator content
    C. additional photoinitiator type
    D. increased curing time

  3. New dual-cure composite resins have made claims that their products can be placed in 2 layers to an unlimited depth. Single curing would eliminate the limitation of the light.

    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. When limited to chemical curing, dual-cure resin cements have _______ mechanical properties due to a _______ degree of conversion.

    A. higher; higher
    B. higher; lower
    C. lower; higher
    D. lower; lower

  5. Historically, it has been recommended that restorative composite resins be placed in increments no greater than _____ mm in thickness.

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

  6. Which factor is the ratio of bonded to unbonded surfaces?

    A. A-factor
    B. B-factor
    C. C-factor
    D. D-factor

  7. A lower ratio of bonded to unbonded surfaces would reportedly diminish the polymerization shrinkage stress. Incremental placement could introduce unwanted voids that would decrease the strength of the restoration.

    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.

  8. Shrinkage stress can lead to the debonding of the composite resin from the tooth surface, forming a marginal gap that results in ___________.

    A. macroleakage
    B. megaleakage
    C. microleakage
    D. millileakage

  9. According to Table 1, __________ minute(s) is the self-curing time for Injectafil DC.

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

  10. The scraping technique was used to determine the __________ of the composite resins.

    A. depth of cure
    B. fracture toughness
    C. macroleakage
    D. polymerization shrinkage

  11. What was determined by the single-edge notched-beam method?

    A. depth of cure
    B. fracture toughness
    C. internal porosity
    D. volumetric polymerization shrinkage

  12. All specimens were allowed to polymerize for ______ hours in distilled water at 37°C in a laboratory oven.

    A. 12
    B. 24
    C. 36
    D. 48

  13. Data were analyzed to evaluate the effect of resin type per property using a 1-way analysis of variance with which statistical test?

    A. Cronbach alpha
    B. Newman-Keuls method
    C. Tukey test
    D. Dunnett test

  14. All of the following are variables for the depth of cure except one. Which is the exception?

    A. type of curing light
    B. irradiance
    C. distance of light guide from restorative material
    D. rubber dam isolation

  15. There is a reduction in polymerization shrinkage stress when filling incrementally and contacting nomore than _____ walls.

    A. 2
    B. 3
    C. 4
    D. 5

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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