Surface characteristics of resin composite materials after finishing and polishing

Self-Instruction Exercise No. 364
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Exercise No. 364
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, Surface characteristics of resin composite materials after finishing and polishing, on pages 26-32. This exercise was developed by Charles F. Martello, DDS, FAGD, in association with the General Dentistry Self-Instruction committee.

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

  • understand the clinical importance of finishing and polishing resin composite materials (RCMs);
  • identify the properties of RCMs that may enhance clinical esthetics; and
  • decide which RCM to select for a particular clinical application.

Answers for this exercise must be received by February 29, 2016.

  1. Which polishing procedure was able to achieve an absolute gloss (AG) value >8?

    A. Medium through HiShine Jiffy disc
    B. Enhance disc and Prisma polishing paste
    C. Medium Sof-Lex disc
    D. Super-Fine Sof-Lex discs

  2. Microfilled resin composites are better suited for which class of restoration?

    A. Class 1
    B. Class 2
    C. Class 4
    D. Class 5

  3. What inherent physical characteristic of an RCM can be significantly influenced by the clinician?

    A. surface gloss
    B. flexural strength
    C. radiopacity
    D. sheer strength

  4. The most common method of classification used for RCMs involves ______________.

    A. curing mechanism
    B. viscosity
    C. filler particles
    D. basic chemistry

  5. Which filler type may improve the polishability of hybrid composites?

    A. nanosized particles
    B. agglomerated microfills
    C. condensed microfills
    D. pre-polymerized particles

  6. How long (in seconds) was each specimen light-activated?

    A. 30
    B. 40
    C. 50
    D. 60

  7. The tested hypothesis was that there are no significant differences between the control and the finishing/polishing procedures with the 2 RCMs. Analysis of the data in this study revealed significant differences between surface roughness (Ra) and AG.

    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. In this study, the clinician completed all finishing/polishing steps within _____ minute(s).

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

  9. On a nonreflective surface, the BetaGloss meter would register a _____ on the absolute scale.

    A. 0.0
    B. 4.0
    C. 8.0
    D. 10.0

  10. Electron photomicrographs were taken at a 250X magnification using a _____ degree tilt to facilitate visualization of surface topography.

    A. 10
    B. 25
    C. 30
    D. 55

  11. Which analysis of the data was used to determine Pearson’s r-correlation and r2 values?

    A. Two-way analysis of variance (ANOVA)
    B. Linear regression
    C. One-Way ANOVA
    D. Fisher’s LSD multiple comparisons

  12. Ra values ≤ _____ µm cannot be discriminated by the patient.

    A. 0.9
    B. 0.7
    C. 0.5
    D. 0.3

  13. Bollen et al showed an increase in bacterial retention on composite resins with a surface roughness above a threshold of _____ micrometers.

    A. 0.2
    B. 0.3
    C. 0.4
    D. 0.5

  14. Rubber abrasives could be combined with all of the following except one. Which is the exception?

    A. diamond
    B. aluminum oxide
    C. silicon carbide
    D. silicon oxide

  15. This study is unique in that it investigated the performance of 2 differently formulated RCMs subjected to a variety of different finishing and polishing procedures. This study is unique in that it is designed to help guide the restorative dentist in the selection of optimal materials and techniques.

    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.


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

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