Effect of pressurized atmosphere on void size and quantity in dental stone and fine-grained phosphate-bonded investment.
This study investigated the effect of pressurized atmosphere on the size and number of voids in dental stones and investments. Control specimens of casts and invested patterns were bench set. Experimental specimens of casts and invested patterns were allowed to set under pressure. The specimens were then sectioned and voids counted and measured to establish a mean. Increased atmospheric pressure reduced the size and number of voids. This method produces improved cast surfaces and fewer, smaller voids in investments. Technicians are continuously searching for ways to improve the quality of their products. One method is placing dental casts and dental investments under increased atmospheric pressure while setting. Several pressure vessels are available for this purpose.
Ryerson
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D002133:Calcium Sulfate / Q000737:chemistry*; D003734:Dental Casting Investment / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D003765:Models, Dental; D010316:Particle Size; D010710:Phosphates / Q000737:chemistry*; D016062:Porosity; D011312:Pressure; D013499:Surface Properties; D013500:Surface Tension
D003734:Dental Casting Investment; D010710:Phosphates; D002133:Calcium Sulfate