Iijima D, Yoneyama T, Doi H, Hamanaka H, Kurosaki N
Department of Oral Diagnosis and General Dentistry, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima Bunkyo-ku, Tokyo 113-8549, Japan.
Biomaterials. 2003 Apr;24(8):1519-24. doi: 10.1016/s0142-9612(02)00533-1.
Titanium has been increasingly applied to dental prostheses because of its biocompatibility. However, application remains limited, due to the low strength and poor wear resistance of unalloyed titanium. The purpose of this study is to evaluate the wear resistance of high-strength Ti-6Al-7Nb alloy castings for dental application. Test specimens were cast from commercially pure titanium (CP-Ti grades 2 and 3) and Ti-6Al-7Nb alloy ingots, and subjected to a wear test simulating the occlusal loading pattern. Wear resistance was evaluated by the weight loss during the test. Ti-6Al-7Nb alloy was found to exhibit lower weight loss than CP-Ti. Moreover, scanning electron microscopic (SEM) observation after the test revealed that the worn surface of Ti-6Al-7Nb alloy is much smoother than that of CP-Ti. These results indicate that Ti-6Al-7Nb alloy castings can be used to produce dental prostheses of improved wear resistance and mechanical strength.
由于钛具有生物相容性，它在牙科修复体中的应用越来越广泛。然而，由于纯钛强度低、耐磨性差，其应用仍然有限。本研究的目的是评估用于牙科的高强度Ti-6Al-7Nb合金铸件的耐磨性。测试样品由商业纯钛（2级和3级CP-Ti）和Ti-6Al-7Nb合金铸锭铸造而成，并进行模拟咬合负荷模式的磨损试验。通过试验期间的重量损失来评估耐磨性。发现Ti-6Al-7Nb合金的重量损失低于CP-Ti。此外，试验后的扫描电子显微镜（SEM）观察表明，Ti-6Al-7Nb合金的磨损表面比CP-Ti的磨损表面光滑得多。这些结果表明，Ti-6Al-7Nb合金铸件可用于生产耐磨性和机械强度更高的牙科修复体。
