Physical properties of a new sonically placed composite resin restorative material

Self-Instruction Exercise No. 368
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Exercise No. 368
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, Physical properties of a new sonically placed composite resin restorative material, on pages 51-56. This exercise was developed by Jean J. Carlson, DDS, FAGD, in association with the General Dentistry Self-Instruction Committee.

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

  • understand the physical properties of heavily filled resins compared with flowable resins;
  • recognize the differences between bulk-fill and packable composite resins; and
  • understand the advantages and disadvantages of a sonic-activated bulk-fill composite material.

Answers for this exercise must be received by April 30, 2016.
  1. The most common cause of failure of composite restorations is _________.

    A. improper material selection
    B. incomplete curing
    C. recurrent caries
    D. occlusal overload

  2. Heavily filled resins have a maximum filler volume of about ____%.

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

  3. Heavily filled composite resins exhibit all of the following improvements in handling except one. Which is the exception?

    A. marginal adaptability
    B. mechanical strength
    C. fracture properties
    D. wear resistance

  4. Flowable composite resins exhibit all of the following traits except one. Which is the exception?

    A. decreased filler concentration
    B. lower viscosity
    C. decreased filler wettability
    D. lower elastic modulus

  5. The ability of a composite material to flow may play a major role in the success of a restoration. In many Class II cavity preparations, it is easy to obtain proper contour and contacts.

    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.

  6. SonicFill reportedly can be used in cavity preparations up to ___ mm deep with only 20 seconds of light curing.

    A. 3
    B. 4
    C. 5
    D. 6

  7. Microfill composite resins contain fillers with an average particle size in the range of ________ µm.

    A. 0.16-0.20
    B. 0.11-0.15
    C. 0.06-0.10
    D. 0.01-0.05

  8. The silorane ring expansion of Filtek LS has been shown to decrease polymerization shrinkage to <______%.

    A. 0.5
    B. 1.5
    C. 2.5
    D. 3.5

  9. All of the following properties were evaluated in the study except one. Which is the exception?

    A. depth of cure
    B. polymerization shrinkage
    C. flexural strength
    D. internal translucency

  10. The greatest depth of cure was exhibited by the _________ composite resin.

    A. Filtek LS
    B. SonicFill
    C. Quixx
    D. Filtek Z250

  11. SonicFill demonstrated an average depth of cure of _____ mm.

    A. 3.17
    B. 3.67
    C. 4.17
    D. 4.67

  12. Incremental layering may inhibit flow during curing. Incremental curing allows maximum polymerization.

    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.

  13. For restorations exposed to greater mechanical loads, the ideal minimum flexural strength is ________ MPa.

    A. 90-100
    B. 80-89
    C. 70-79
    D. 60-69

  14. Which of the following restorative materials was found to have the highest relative fracture toughness?

    A. Quixx
    B. SonicFill
    C. Filtek LS
    D. TetricEvoCeram

  15. All of the following are characteristics of SonicFill except one. Which is the exception?

    A. high shrinkage
    B. high flexural strength
    C. moderate fracture toughness
    D. low percent porosity

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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