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KMID : 0362220070340020049
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Journal of The Korean Research Society for Dental Materials
2007 Volume.34 No. 2 p.49 ~ p.59
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Characteristics of Ti-Nb-Si alloy as biomaterials
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Lee Wang-Woo
Kwon Tae-Yub
Kim Won-Yong
Kang Hwang-Jin
Kim Kho-Han
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Abstract
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The objective of this study was to evaluate the mechanical properties and cytotoxicity of two types of Ti-Nb-Si alloy designed for biomaterials. Ti-26Nb-0.5Si and Ti-26Nb-1.0Si alloys were prepared by vacuum arc melting method. The button ingots obtained were cold rolled to get appropriate thickness and diameter of specimens for the experiments. X-ray diffraction (XRD) analysis was conducted on finely polished samples to identify the crystal structures of constituent phases. Tensile test was carried out using a universal testing machine. Elastic modulus measurements were carried out using a resonance vibration method. Micro Vickers hardness was measured by Vickers hardness tester. Fatigue test was performed by the indication of ISO 14801 and the cytotoxicity test was performed by ISO 10993-5. In XRD measurement, β phase, α“ phase were confirmed in Ti-26Nb-0.5Si alloy, and same β phase and α“ phase were detected in. Ti-26Nb-1.0Si alloy. The mechanical properties of yield strength, ultimate tensile strength, elastic modulus and strain of Ti-26Nb-0.5Si alloy were 441 MPa, 567.2 MPa, 50.7 GPa and 19.8%, respectively. Vickers hardness value was 254.1 Hv. The mechanical properties of yield strength, ultimate tensile strength, elastic modulus and strain of Ti-26Nb-1.0Si alloy were 446.1 MPa, 548.1 MPa, 44.7 GPa and 12.2%, respectively. Vickers hardness value was 203.1 Hv. At 347 N, three samples survived with no fail at 5,126,223, 5,979,089 and 5,520,678 cycle, that means the samples withstood 5×106 cycles at 347 N as the fatigue limit. These specimens fatigue tested at 347 N showed no material yielding, no permanent deformation, and no fracture. There was no cytotoxicity when examined in vitro elution test. Morphology changes in, for example, general morphology, vacuolization, detachment, cell lysis and membrane integrity were not found in the cells microscopically.
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KEYWORD
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dental implant, Ti-Nb-Si alloy, biomaterial
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