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unit 5 PIMA

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
Using the amount of water in your mix of dental stone would...   lengthen the setting time produce thiner mix produce weaker cast  
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Bypsum products set faster when...   reduce the water/powder ratio  
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If chemical shortens the setting time of gypsum it is called...   accelerator  
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Potasium sulfate is added to gypsum productto...   Allelerate set and reduce expansion  
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A dental stone cast is_____ than plaster cast...   stronger  
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In mixing gypsum product it is recomended that...   powder should be sifted into the water  
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During setting, a plaster cast will...   expand  
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In pouring stone should be added at only one corner of an impression to prevent...   air on water from being trapped on the surface of the cast  
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Plaster may be used... 2   as study models attach models to articulators  
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High strength dental stone (class II improved) is used...   to make dies  
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Dental stone is   calcuim sulfate hemhydrate  
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The heat which is given off during a chemical reaction is termed...   exothermic heat  
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______ _____has the lowest water to poeder ratio...   die stone  
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The strength and hardness of gypsum madel or cast depends on...   water-powder ratio and porosity of cast  
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____, ____, _____ would shorten (decrease) setting time of plaster stone...   use of warm water increasing the rate of spatulation decrease water powder ratio use of accelerators  
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TorF? It's desiriable to allow plaster or stone to set for 45-60 minutes before removing the cast from the impression...   True  
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TorF? Trapped air in the mix of stone or plaster will appear raised on the model...   False  
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Gypsum products should be mixed to a ____ consistensy...   creamy  
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TorF? All of the different types of gypsum products have different water powder ratio...   True  
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TorF? Moisture is not a consern when storing gypsum products   False  
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Created by: Urania
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