Effects of mixing technique on bubble formation in alginate impression material

Self-Instruction Exercise No. 338
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Exercise No. 338
Subject Code: 017
Dental Materials

The 15 questions for this exercise are based on the article, “Effects of mixing technique on bubble formation in alginate impression material”, on pages 35-39. This exercise was developed by Merlin P. Ohmer, DDS, FAGD, in association with the General Dentistry Self-Instruction Committee.

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

  • understand different alginate mixing techniques;
  • understand the characteristics of alginate; and
  • choose the best mixing technique to use in your dental practice.

Answers for this exercise must be received by August 31, 2014.
  1. Alginate mixing techniques have __________ effect on the final product.

    A. no
    B. mild
    C. moderate
    D. great

  2. Adding alginate powder to the water and then mixing exhibited significant differences utilizing the __________ technique.

    A. spinning bowl
    B. manual spatulation
    C. centrifuge
    D. vacuum mixer

  3. Internal porosity was lowest for the __________ technique.

    A. spinning bowl
    B. manual spatulation
    C. centrifuge
    D. vacuum mixer

  4. Alginate exhibits all of the following properties except one. Which is the exception?

    A. inexpensive
    B. irreversible after mixing
    C. reasonably accurate
    D. hydrophobic

  5. The benefit of alginate is that it is not technique sensitive. Seating the impression tray in the mouth is more important than the loading of the tray.

    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 water used in the study was room temperature at ____ degrees F.

    A. 72
    B. 74
    C. 76
    D. 78

  7. The proper water to powder ratio is ____ ml to ____ g.

    A. 60; 21
    B. 60; 3
    C. 30; 21
    D. 30; 3

  8. The recommended mixing time using the spinning bowl is ____ seconds.

    A. 10
    B. 15
    C. 30
    D. 60

  9. The recommended mixing time for the centrifuge is ____ seconds.

    A. 10
    B. 15
    C. 30
    D. 60

  10. The recommended mixing time for the vacuum mixer is ____ seconds.

    A. 10
    B. 15
    C. 30
    D. 60

  11. How many trials were used for each mixing technique?

    A. 4
    B. 10
    C. 20
    D. 80

  12. The models used in the study were

    A. dry.
    B. damp.
    C. wet.
    D. a mixture of each.

  13. The impressions were evaluated examining __________ size of material.

    A. 1 cm
    B. 1 cm2
    C. 1 cm3
    D. 1000 mm2

  14. The vacuum mixer produced samples with no voids exactly ____ % of the time.

    A. 5
    B. 22.5
    C. 30
    D. 82.5

  15. Mixing directions are consistent throughout dental texts and literature. The powder is always added to the bowl first.

    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.

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
 
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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