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 0.1–0.5wt.% 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 0.1–0.5wt.% CaO additives had an acceptable marginal accuracy with a marginal gap of less than 50μm; the 0.4wt.% CaO additive gave the best accuracy. Based on a micro-chemical analysis, the addition of 0.1–0.5wt.% 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 0.5wt.% CaO had the thinnest reaction layer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
