抄録
A study was made as to how the bond strength in the agar-alginate combined impression technique is affected by the variations in such factors as the length of time left alone, the W/P ratio and the temperature of the combining water with regard to the alginate impression material on the one part and the length of time left alone, the temperature maintained and the number of times of boiling with regard to the agar impression material on the other. As a result, the following conclusions were obtained.
1. As regards the alginate impression material, the bond strength was found to decrease with the elapse of time it is left alone after combination. There was no increase or decrease effect of the W/P ratio, and an increase in bond strength was noted when the temperature of the water in which the materials were combined was low.
2. As regards the agar impression material, the bond strength decreased with the elapse of time the material was left alone after combination. The result was good when the temperature was maintained at 60°C, while the number of times of boiling was found to give no effect.
