생체용 Ti-Nb-Si 합금의 특성
Characteristics of Ti-Nb-Si alloy as biomaterials
이왕우, 권태엽, 김원용, 강황진, 김교한,
소속 상세정보
이왕우 ( Lee Wang-Woo ) - 경북대학교 대학원 치의학과
권태엽 ( Kwon Tae-Yub ) - 경북대학교 치과대학 치과생체재료학교실
김원용 ( Kim Won-Yong ) - 한국생산기술연구원
강황진 ( Kang Hwang-Jin ) - (주)엔아이비
김교한 ( Kim Kho-Han ) - 경북대학교 치과대학 치과생체재료학교실
KMID : 0362220070340020049
Abstract
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.
키워드
dental implant;Ti-Nb-Si alloy;biomaterial
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