牙科用Ti-Zr合金與低熔點瓷牙之鍵結強度及熱膨脹係數研究

本研究主要探討二元Ti-Zr合金與商用低熔點瓷牙之鍵結強度，並量測Ti-Zr合金的熱膨脹係數。實驗結果指出，Ti-10Zr合金有最高的鍵結強度，且高於純鈦(c.p.Ti)。當Zr元素含量爲20wt%或更高時，合金之鍵結強度均低於ISO9693規範的25MPa。此外，Ti-Zr合金之熱膨脹係數均較c.p.Ti低，約在9.4×10^(-6)/℃至9.9×10^(-6)/℃之間，且隨著Zr元素含量增加而降低。另一方面，Ti-30Zr及Ti-40Zr合金經燒瓷後試片會產生翹曲現象，可能與其熱膨脹係數遠低於瓷牙之熱膨脹係數有關。由於Ti-10Zr合金與瓷牙的熱膨脹係數差異較小，因此在本實驗中有較佳的鍵結強度表現。

關鍵字

鈦合金；牙科合金；鍵結強度；熱膨脹係數

並列摘要

This study was designed to evaluate the bonding characteristics of titanium porcelain Duceratin when bonded to Ti-Zr alloys and commercially pure titanium (c.p. Ti). The coefficient of thermal expansion (CTE) of all Ti-Zr alloys and c.p. Ti were also evaluated. The experimental results indicated that the Ti-10Zr alloy had the highest bonding strength, being higher than that of c.p. Ti. When the Zr content was increased to 20 wt% or greater, the respective strengths were below the minimum value in the ISO 9693 standard (25 MPa). Moreover, the CTE values of the Ti-Zr alloys were lower than that of c.p. Ti (10.1 ×10^(-6)/℃), ranging from 9.4 to 9.9×10^(-6)/℃. The CTE values had a tendency to decrease as the zirconium content increased. However, the CTEs for Ti-30Zr and Ti-40Zr were lower than that of Duceratin; hence, the surfaces of the Ti-30Zr and Ti-40Zr alloy specimens on which the porcelain was fired were observed to curve slightly toward the porcelain side while cooling. Thus, it was concluded that the high bonding strength of the Ti-10Zr alloy was the result of the small difference in the CTE between this alloy and the Duceratin porcelain, an outcome which appears to verify the fact that weak bonding strength is the result of a mismatch between CTEs.

並列關鍵字

Ti alloy ； dental alloy ； bonding strength ； coefficient of thermal expansion

國際替代計量

牙科用Ti-Zr合金與低熔點瓷牙之鍵結強度及熱膨脹係數研究

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