牙科用鑄造Ti-Cr合金之金屬燒付陶瓷鍵結與熱膨脹係數研究

Metal-Porcelain Bonding and Thermal Expansion Coefficients of Ti-Cr Alloys for Dental Casting

何文福(Wen-Fu Ho) ； 姜宗佑(Tsung-Yu Chiang) ； 許學全(Hsueh-Chuan Hsu) ； 吳世經(Shih-Chinng Wu) ； 林錫禎(Hsi-Chen Lin)

《科學與工程技術期刊》 4卷3期 (2008/09) Pp. 19-25

https://doi.org/10.7117/JSET.200809.0019

摘要

鈦及其合金由於具有良好的生物相容性、高比強度、優良抗腐蝕性及低成本等因素漸被廣泛應用在牙根植體或假牙等牙科修復材。當鈦金屬作爲金屬－陶瓷復形體使用時，其鑄造性及鍵結強度等是主要面臨的問題，而鈦金屬與陶瓷體之鍵結機構相當複雜目前仍待更多的研究探討。本實驗之目的是探討一系列Ti-Cr合金進行表面燒瓷，依據ISO 9693之規範使用三點彎曲試驗量測其鍵結強度。結果指出，Ti-Cr合金與陶瓷間之鍵結強度均高於c.p. Ti(commercially pure titanium)且Ti-20Cr及Ti-30Cr合金與陶瓷間之鍵結強度高於ISO 9693規範之最低鍵結強度(25 MPa)。此外，Ti-Cr合金之熱膨脹係數較c.p. Ti高，其中以Ti-30Cr合金有最大之熱膨脹係數(11.8×10^(-6)/℃; 25℃~350℃)且與陶瓷體之熱膨脹係數值(12.5×10^(-6)/ ℃)差異遠小於1×10^(-6)/ ℃。因此，Ti-30Cr合金相當適合作爲牙冠或牙橋燒付瓷體之修復材用途。

關鍵字

鈦合金 ； 牙科合金 ； 鍵結強度 ； 熱膨脹係數

並列摘要

Titanium and its alloys have widespread use in implants and prostheses due to their excellent biocompatibility, high strength-to-weight ratio, corrosion resistance and low cost. Problems with casting and porcelain bonding are encountered when titanium is used in metal-porcelain restorations. The bonding mechanisms in titanium-porcelain systems are complex and poorly understood. The purpose of this study was to evaluate the bonding strength between porcelain and cast Ti-Cr alloys by using a three-point bending test in accordance with ISO 9693. The results showed that the bonding strengths of the Ti-Cr alloys were all higher than that of c.p. Ti (commercially pure titanium). Specifically, the strengths of Ti-20Cr and Ti-30Cr alloys were higher than the minimum value in the ISO 9693 standard for the three-point bending test (25 MPa). The coefficients of thermal expansion of the Ti-Cr alloys were higher than that for c.p Ti. The difference in these coefficients between Ti-30Cr alloy and porcelain is lowest among all the Ti-Cr alloys, being less than 1×10^(-6)/℃. Therefore, the Ti-30Cr alloy can be used for prosthetic dental applications if other properties necessary for dental castings are obtained.

並列關鍵字

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