機能的印象材の物性に関する基礎的研究
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At present time, the functional impression materials have been willingly used for performing the tissue treatment and taking the dynamic impression. However, the physical and mechanical properties of these materials in oral cavity are not elucidated sufficiently as yet. So the author measured the variation of the coefficient of viscosity and torsional shear modulus with time of the mixture mixed in various ratios at 23℃ and 37℃ for five commercial functional impression materials (Hi-soft, Hydrocast, Tri-plastic, Visco-gel, Tempo). In addition, the swelling of powder to liquid was examined by microscope and the water absorption of the functional impression material (powder-liquid mixture) was investigated by using gas chromatograph. The results obtained were as follows : 1. The working time of Hydro-cast, Hi-soft and Visco-gel was longer than that of Tri-plastic and Tempo, and the variation of torsional shear modulus and the coefficient of viscosity within working time were smaller. 2. The working time of the materials used was varied by mixing temperature and mixing ratio (P/L). When the temperature of mixture rose and ratio (P/L) increased, the working time was shortend. 3. The torsional shear modulus at 60 min from start of mix was 49.7×10^4dyne/cm^2 for Tri-plastic, 41.5×10^4dyne/cm^2 for Visco-gel, 22.4×10^4dyne/cm^2 for Hydro-cast, 21.0×10^4dyne/cm^2 for Tempo and 17.5×10^4dyne/cm^2 for Hi-soft. 4. The materials used in this investigation lost ethanol and absorbed water by soaking in distilled water.
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