Abstract
In order to clarify the properties of investments for titanium and the inner surface form change of a cast crown, a survey of roughness, hardness (Hv), compressive strength, setting expansion, and thermal expansion was made by using five kinds of titanium investment as well as by changing the condition of heating or not heating. Three kinds of investment except alumina having a very rough surface were selected, and cast crowns were made by changing the condition of using or not using the relief. The inner surface form change was comparativery investigated by a three-dimensional measurement system. The result were as follows:1. As for setting expansion, the materials were divided into three types, i.e., the first was Selevest, Titavest, and Titanmold which remained fixed for two hours, the second was Titanium which indicated 0.2% at twenty minutes, and the last was Ceravest whose setting expansion increased from the beginning indicating 1.2% at ninety minutes.2. As for thermal expansion, Selevest, Titavest, and Titanmold contracted by heating but Ceravest and Titanium expanded.3. The indicated heating expansion rates were 0.2% for Selevest at 200°C, 0.6% for Titavest at 600°C, 0.5% for Ceravest and 0.5% for Titanium at normal temperature, and 0.3% for Titanmold at 800°C.
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