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[Non-invasive detection of metal casting defects using dental X ray machine]
Kan Xu1, Zheng-jie Dong, Yu-hua Wang
1Department of Prosthodontics, School of Stomatology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
Purpose:
The purpose of this in vitro study is to find the best parameters in detecting the casting defects made of titanium, nickel-chromium and chromium-cobalt using dental X ray machine.
Methods:
Casting sheets in different thickness (1.0 mm, 0.6 mm, 0.3 mm)were fabricated using of Ti, Ni-Cr and Cr-Co.Small pores on the surfaces were made with laser welder to simulate the internal porosity of the castings. Parameters of the dental X ray machine were adjusted to take films. The data were analyzed using SPSS12 software package for group t test.
Results:
The thickness of Ti had no significant effect on the setting of the parameters of the dental X ray machine in detecting the defects of titanium castings (P>0.05), while the thickness of Ni-Cr and Cr-Co had significant effect on the setting of the parameters (P<0.05).
Conclusion:
Dental X ray machine can be used in detecting the defects of titanium casting sheets.
