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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| show | A. directly
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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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| The final setting time for gypsum products typically is: A. 10-30 min B. 30-45 min C. 45-90 min D. 90-120 min | show 🗑
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| show | B. 14-15 ml
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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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| Decreasing the setting time of a dental material results in a product that: A. will set faster B. will set slower C. does not effect the setting time D. enhances the properties | show 🗑
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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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| When the setting time of a dental material is increased, which of the following is true? A. the material sets slower B. the material sets faster C. the setting reaction does not change D. the setting reaction is increased | show 🗑
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