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A newly developed calcia/titanium modified magnesia-based investment mold for titanium casting
Authors:Pei-Ling Lai  Wen-Cheng Chen  Jen–Chyan Wang  Ta-Ko Huang  Chun-Cheng Hung
Affiliation:1. School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, 100 Shih-Chuan 1st Rd., Kaohsiung City 807, Taiwan;2. Department of Prosthodontics, Kaohsiung Medical University Hospital, No. 100 Tzyou 1st Rd., Kaohsiung City 807, Taiwan;3. Department of Dentistry , St. Joseph Hospital, No.352 Chien Kuo 1st Rd., Kaohsiung City 802, Taiwan
Abstract:Calcia (CaO) investment has the high stability with melted pure titanium (Ti) but the poor manipulation usually leads to low success rate of complete castings. Magnesia (MgO)-based investment can produce the high success rate of pure Ti casting though. However, the MgO-based investment should be accompanied with Ti powder to meet the accuracy of Ti castings. In this study, a pure titanium casting using Ti powder modified MgO-based investment and 0.1–0.5 wt.% CaO additive was investigated. Experimental results showed that pure Ti cast with a modified MgO-based dental investment with Ti/CaO resulted in a higher success rate of the complete casting and a decrease in the interfacial surface reaction at high casting temperatures as compared to unmodified MgO-based investments with Ti powder. This newly developed Ti modified MgO-based investment and 0.1–0.5 wt.% CaO additives had an acceptable marginal accuracy with a marginal gap of less than 50 μm; the 0.4 wt.% CaO additive gave the best accuracy. Based on a micro-chemical analysis, the addition of 0.1–0.5 wt.% CaO to the Ti modified MgO-based investment significantly reduced the reaction layers and casting defects in pure Ti casting, which had proven to enhance Ti–porcelain bonding; the investment modified with 0.5 wt.% CaO had the thinnest reaction layer.
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