熱膨張抑制埋没材を用いたときの鋳造冠の変形に関する研究

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  • Deformation of Crowns Cast in Thermal Expansion Inhibited Investment.

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Experimentally thermal expansion inhibited investment was produced to discuss a problem, the compensation of metal casting shrinkage is to be dependent upon setting expansion. Using the various concentration of colloidal silica solution as mixing liquid, idealized full cast crowns were made, the each size were measured and the following results were obtained.<BR>On this investment:<BR>1. As the more concentration of silica, the more expansion appeared.<BR>2. The shrinkage in cooling is slight.<BR>3. The expansion in ringless method is greater than that of ring method.<BR>On the deformation of crowns:<BR>1. In the external width, both ring and ringless method in 10% and 20% showed shrinkage, the more concentration, expansive tendency appeared. The inhibition of expansion appeared in 40% by ring method. The expansion of cervical showed larger than occlusal.<BR>2. Internal width in 10% appeared shrinkage by both methods, they showed more expansion, increasing of concentration. The internal tendency appeared that occlusal was greater than cervical. The expansion of internal showed greater than external.<BR>3. Despite of methods the more expansion appeared, increasing concentration. The more expansion appeared in the internal height than in external.<BR>The mention above following conclusion were obtained.<BR>It was cleared that the various deformation of crowns appeared due to the setting expansion of investment alone. Accordingly it was considered that the deformation occur in the stage of setting expansion before thermal stage in the present dental casting procedure. It can be said that the setting expansion is the great factor of the deformation in cast crowns.

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