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Sunday, June 29, 2008

Prosthodontics MCQ 53

Sunday, June 29, 2008

Which of the following are incorrect for gypsum products?

  1. The smaller the water: powder ratio of the original investment water mixture, the less the hygroscopic setting expansion.

  2. As the mixing time is reduced, the hygroscopic expansion is decreased.

  3. The greatest amount of hygroscopic setting expansion is observed if the immersion takes place after the initial set.

  4. The longer the immersion of the investment in the water bath is delayed beyond the time of the initial set of the investment; the lower is the hygroscopic expansion.

  5. A mixture of silica and gypsum hemihydrate results in setting expansion greater than that of the gypsum product when it is used alone.

    1. 1 only

    2. 1 and 2

    3. 1 and 3

    4. 3 and 4

    5. 5 only

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