CP titanium casting procedure using magnesia transferring Process of coating

Abstract

Phosphate-bonded investment materials are most frequently used for casting pure titanium because of their compatibility, ease of manipulation, and reasonable price. However, a reactive layer forms on the surface of CP titanium when cast in phosphate-bonded investment materials. The magnesia transfer process of casting was devised to improve the reactive layer of CP titanium denture bases cast with phosphate-bonded investment, We compared various properties of coating samples used with the magnesia transfer process with those of control samples made with a conventional investing method. We found that the surface of the molds contained coating materials when the transfer process was used. A small amount of residual investment was observed on the coating samples removed from the mold. A reactive layer was observed in the control samples when the microstructure was observed. An electron probe microanalyzer (EPMA) was used to determine distribution of various elements in the superficial layer of the castings. However, this layer was redused in the samples that were coated. These results suggest that it is possible to improve the reactive layer of CP titanium casting plates using phosphate-bonded investments when the magnesia transfer process of coating is used.