| Summary: | 碩士 === 中臺科技大學 === 醫學工程暨材料研究所 === 97 === This research aimed to evaluate the ternary Ti-10Zr-X (X = Nb, Mo, Fe, Cr) and Ti-20Cr-X (X = Nb, Mo, Fe, Zr) alloys, compared with that of commercially pure titanium (c.p. Ti). Included in this evaluation criterion, are the bond strengths between porcelain (Duceratin), their corrosion resistance and their biocompatibility.
The Ti-10Zr-X alloys aspect:
The results indicate that Ti-10Zr-Nb had the highest bond strength (22.76 MPa), which was higher than that of c.p. Ti (21.1 MPa). In addition, the thermal expansion coefficient (CTE) values of the Ti-10Zr-X alloys were lower than that of Duceratin (12.5×10-6 /℃), and ranged from 9.63×10-6 /℃ to 9.86×10-6 /℃. It would verify the fact that weak bond strength is the result of a mismatch between CTEs. Linear polarization results showed that artificial saliva and that containing NaF resulted in different corrosion behavior in Ti-10Zr-X alloys and c.p.Ti. The Ti-10Zr-X alloys had lower resistance to corrosion in the fluoride-containing artificial saliva than that of c.p. Ti. ESCA results verify that after potentiodynamic polarization, a passive film consisting of TiO2 and ZrO2 formed on the surface of Ti-10Zr-X. The SEM observation and MTT assay indicate that the osteoblast-like cell (MG-63) growth on all Ti-10Zr-X alloys and c.p.Ti showed good biocompatility.
The Ti-20Cr-X alloys aspect:
The results indicate that Ti-20Cr-Mo had the highest bond strength (31.5 MPa), which was higher than that of c.p. Ti (21.1 MPa). In addition, the CTE values of the Ti-20Cr-X alloys were higher than that of c.p. Ti (10.12×10-6 /℃), and ranged from 11.03×10-6 /℃ to 11.36×10-6 /℃. This indicates the fact that strong bond strength is the result of a closer match between CTEs. Linear polarization results showed that Ti-20Cr-X alloys had better resistance to corrosion in the fluoride-containing artificial saliva than that of c.p. Ti. ESCA results verify that after potentiodynamic polarization, a passive film consisting of TiO2 and Cr2O3 formed on the surface of Ti-20Cr-X. The SEM observation and MTT assay indicate that the osteoblast-like cell (MG-63) growth on all Ti-20Cr-X alloys and c.p.Ti showed good biocompatility.
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