Effect of toothbrushes and denture brushes on heat-polymerized acrylic resins

Self-Instruction Exercise No. 380
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Exercise No. 380
Subject Code: 671
Complete Dentures

The 15 questions for this exercise are based on the article Effect of toothbrushes and denture brushes on heat-polymerized acrylic resins on pages 49-53. This exercise was developed by Anthony S. Carroccia, DDS, MAGD, ABGD, in association with the General Dentistry Self-Instruction committee.

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

  • understand characteristics of acrylic resin denture bases;
  • know how dentifrice and/or brush selection may impact abrasion; and
  • understand potential negative effects of denture hygiene.

Answers for this exercise must be received by December 31, 2016.
  1. The accumulation of biofilm on denture surfaces is an uncommon problem among denture users. The mechanical removal of debris by means of a toothbrush, dentifrice, and water is a popular cleaning technique.

    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.

  2. Abrasion of polymerized acrylic resin denture bases may result in all of the following except one. Which is the exception?

    A. loss of mass
    B. loss of polish
    C. loss of surface detail
    D. loss of monomer

  3. A surface roughness of _______ is the threshold for bacterial adhesion.

    A. 0.2 µm
    B. 2.0 µm
    C. 0.2 mm
    D. 2.0 mm

  4. The degree of surface roughness caused by toothbrushing is influenced by all of the following except one. Which is the exception?

    A. technique
    B. force
    C. frequency
    D. geometry

  5. There are few other comparative studies of dentifrice abrasion on various resins. Much information is available regarding abrasiveness of toothbrush and denture brush bristles on denture base resins.

    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. The goal of this study was to evaluate weight loss and surface roughness of _________ commercially available acrylic resins after brushing with _________ different toothbrushes and denture brushes.

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

  7. How many denture base resin blocks were made for this experiment?

    A. 120
    B. 90
    C. 60
    D. 30

  8. How many strokes were used on each specimen to approximate 1 year of manual brushing?

    A. 8,900
    B. 17,800
    C. 35,600
    D. 53,400

  9. Which analytic measure was used as a post hoc test?

    A. standard deviation of the mean
    B. Tukey test
    C. chi-square test
    D. 3-way analysis of variance

  10. Which resin was the least abrasion resistant?

    A. Clássico
    B. Lucitone 550
    C. Onda-Cryl
    D. VIPI Wave

  11. After how many years should dentures be replaced?

    A. 1-2
    B. 3-4
    C. 5-7
    D. 8-10

  12. Which acrylic resin was the smoothest before brushing?

    A. Clássico
    B. Lucitone 550
    C. Onda-Cryl
    D. VIPI Wave

  13. Which acrylic resin demonstrated the least weight loss?

    A. Clássico
    B. Lucitone 550
    C. Onda-Cryl
    D. VIPI Wave

  14. All of the following can influence the properties of acrylic resins except one. Which is the exception?

    A. C-factor
    B. manner of polymerization
    C. temperature
    D. time

  15. Which acrylic resins were polymerized by microwaves?

    A. Clássico and VIPI Wave
    B. Clássico and Lucitone 550
    C. VIPI Wave and Onda-Cryl
    D. Lucitone 550 and Onda-Cryl

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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