A Study of Corrosion of Titanium Alloys Used in Dental Work

Research Project

Project/Area Number	61570939
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	補綴理工系歯学
Research Institution	Tokyo Dental College
Principal Investigator	YUTAKA Oda Department of Dental Technology, Tokyo Dental College, 歯科理工学教室, 講師 (00085838)
Project Period (FY)	1986 – 1987
Project Status	Completed (Fiscal Year 1987)
Budget Amount *help	¥1,200,000 (Direct Cost: ¥1,200,000) Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000) Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Keywords	Titanium Alloy / Electrochemistry / Corrosion / Tranish / 溶出 / アノード分極
Research Abstract	This study aims to evaluate the in vitro corrosion characteristics of titaium alloys used for dental purposes. Alloys Ti-Al binary system, Ti-Cu binary system, Ti-Ni binary system, Ti-6Al4V, Ti-55Ni, Ti-13Cu, Ti-5Al-8Cu alloys were investigated in terms of electrochemical behavior , weight change, tarnish analysis, and metal component dissolution in artificial saliva. The natural potential region of titanium alloys that contain more than 50% titanium was getween -0.1V and -0.6V. The polarization resistance of the titanium alloys was 30 - 50X10^5ohm .cm^2. The braakdown potential of the titanium alloys were nonetheless above 1.0V. Titanium alloys were the less susceptibel to tarnish than gold dental alloys. Although, after 12 weeks, no evident weight loss was observed in these titanium alloys, Ni was found to dissolve slightly from Ti-Ni binary alooy and Cu was dissolved slightly from alloys containing it. these sdata show taht the corrosion resistance of the titanium alloys investigate is higher than that of dental use gold alloy.