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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.
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Question
Answer
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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