[Research on investing methods and mold cooling methods of the self-made investment for pure titanium castings].
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 microm), lower strength and similar elongation rate, the titanium castings by bench cooling showed clinically acceptable full crown fit with 115 microm thick reaction layer as cast.


CONCLUSIONS
The one-step investing method and the bench cooling are recommended for the self-made investment.
Zhao
Juan
J
Dept. of Prosthodontics, Affiliated Hospital of Stomatology, College of Medicine, Zhejiang University, Hangzhou 310006, China.
Huang
Xu
X
Zhao
Yun-Feng
YF
Xiao
Mao-Chun
MC
Li
Yong
Y
D003442:Crowns; D003734:Dental Casting Investment; D003735:Dental Casting Technique; D003764:Dental Materials; D005658:Fungi; D007449:Investments; D008422:Materials Testing; D013499:Surface Properties; D014025:Titanium
D003734:Dental Casting Investment; D003764:Dental Materials; D014025:Titanium