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This study was aimed at obtaining a desirable wax pattern for inlay. The method used was to analyze, mix, and heat several kinds of waxes, comparing the temperatures of their components. The result was Type C wax. In type C the amount of paraffin was generally contained (60%-70%) was reduced t to 45% and there was mixed 10%-15% of carnauba, which was intended for the wax not to soften readily at low temperatures. The type C has some advantages for general use : handy preparation, high safety, and economy. The inlay waxes commonly used contracted if the temperature fell from 38℃ to 28℃, but the contraction of type C was observed to he 0.2%-0.4% in proportion to the 10℃ fall. This was more characteristic in mixing.
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