Factors influencing dimensional accuracy of calcium phosphate crystalline ceramic bridges

Abstract

I investigated the laboratory conditions needed for good dimensional accuracy of calcium phosphate crystalline ceramic bridges. I examined how the signal to noise ratio and sensitivity of the measurements, and orientation of the retainers influenced dimensional changes. The optimum conditions that produced the minimum amount of disruption in these factors was confirmed by the analysis of variance. It was found that the optimum dimensional accuracy for the bridge could be obtained by using a casting ring 45 mm in diameter, ring liner, an investment of medium expansion, and a ratio of 50% liquid.