Influence of Magnesia Coating Materials for Refractory Models on Reactive Layer of Pure Titanium Cast.

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  • Moriguchi Ai
    Graduate School of Dentistry (Prosthodontics), Osaka Dental University

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  • 耐火模型用マグネシア系コーティング材が純チタン鋳造体反応層に与える影響

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Abstract

Magnesia coating materials for refractory models were produced to improve a reactive layer of the pure titanium denture base cast using phosphate-bonded investment, and various properties of coating samples using the coating refractory models were compared with those of control samples made by a conventional investing method. The results were as follows:<BR>A small residual investment was observed on the coating samples removed from the mold.<BR>The surface roughness of coating samples was greater than that of control samples.<BR>The hardness of coating samples was lower than that of control samples in the depth range from the surface to about 45μm.<BR>As for coating samples, the microstructure of the surface of the castings showed almost no evidence of a corroded zone, while that of control samples exhibited a layered structure of characteristic pure titanium castings.<BR>Use of an electron probe microanalyzer (EPMA) to determine distribution of various elements in the superficial layer of castings revealed a reduced reactive layer containing impurity elements in coating samples, and a reactive layer containing Si and P in control samples.<BR>These results suggested that it is possible to improve a reactive layer of pure titanium castings using phosphate-bonded investment by magnesia coating of the surface of the refractory models.

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