West China Journal of Stomatology

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Research on Investing Methods and Mold Cooling Methods of the Self-made Investment for Pure Titanium Castings

ZHAO Juan1, HUANG Xu2, ZHAO Yun-feng3, XIAO Mao-chun3, LI Yong3   

  1. 1. Dept. of Prosthodontics, Affiliated Hospital of Stomatology, College of Medicine, Zhejiang University, Hangzhou 310006, China; 2. Dept. of Stomatology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China; 3. Dept. of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2006-10-25 Revised:2006-10-25 Online:2006-10-20 Published:2006-10-20

Abstract:

Objective  To observe the influence of different investing methods and mold cooling methods on pure titanium castings invested in the self-made investment, and to provide theoretic base for the development for the investment. Methods  The influence of investing methods(one-step investing method and two-step investing method) on castability and crown fit of titanium castings were investigated, and the influence of cooling methods on reaction layers, mechanical properties and crown fit of titanium castings were investigated. Results  Both the investing methods exhibited good castability, but only the titanium full crowns by one-step investing method showed clinically acceptable fit. Although the quenching group showed thinner reaction layer(100 μm), lower strength and similar elongation rate, the titanium castings by bench cooling showed clinically acceptable full crown fit with 115 μm thick reaction layer as cast. Conclusion  The one-step investing method and the bench cooling are recommended for the self-made investment.

Key words: titanium, cast, investing method, cooling method