Chapter 9- Gypsum Materials
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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The desirable strength of gypsum materials is _______ related to the amount if water used. A. directly B. Indirectly C. not D. partially | show 🗑
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For gypsum products, a suitable accelerator and retarder, respectively, would be: A. ethyl alcohol and oleic acid B. oleic acid and glycerin C. borax and potassium sulfate D. potassium sulfate and borax | show 🗑
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show | D. improved stone
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show | B. 30-45 min
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To make a correct mix for dental stone when using 50 g of powder, the amount of water would be approximately: A. 10-12 ml B. 14-15 ml C. 28-30 ml D. 45-50 ml | show 🗑
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At a previous appointment, the orthodontist took impressions of the maxillary and mandibular arches. The replicas made from each impression to discuss the treatment plan are termed: A. casts B. dies C. study models D. molds | show 🗑
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show | A. will set faster
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show | C. plaster
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show | B. dry strength
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show | C. add powder to the water
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A practical, easy method to determine final setting time in a dental office would be: A. set a timer for 20 min B. observe the change from wet to dry strength C. watch for the loss of gloss D. attempt to penetrate the material with the metal spatula | show 🗑
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show | A. the material sets slower
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