Evaluation of brittleness of porcelain fused to pure titanium by fracture toughness, hardness and fracture energy.
Evaluation of brittleness of porcelain fused to pure titanium by fracture toughness, hardness and fracture energy.
复制标题
通过断裂韧性、硬度和断裂能评价纯钛熔瓷的脆性。
DOI：
10.4012/dmj.22.532
复制
发表时间：
2003
影响因子：
2.5
通讯作者：
T. Nagasawa
中科院分区：
文献类型：
--
作者：
Yoshifumi Higashino;M. Yamauchi;T. Goto;T. Nagasawa
为阐明纯钛烤瓷（PFPT）在临床应用中出现与普通瓷相似的碎裂和开裂的脆性原因，测定了PFPT的断裂韧性KIc、硬度（Hv和Hk）和反映原子结合能的断裂能γ。PFPT与普通瓷的KIc、Hv和Hk无显著差异，但PFPT的γ值（由KIc和共振法测得的杨氏模量计算）小于普通瓷。这些结果表明，机械性能，如KIc和硬度并不总是证实PFPT在实际使用中经历的脆性。然而，PFPT的相对较小的γ可能表明疲劳裂纹扩展是更可能的现象，因为它比口腔中的常规裂纹更容易发生。
To elucidate the cause of brittleness of porcelain fused to pure titanium (PFPT) which leads to chipping and cracking similar to that of conventional porcelain in clinical use, fracture toughness KIc, hardness (Hv and Hk) and fracture energy gamma reflecting the bonding energy of atoms were evaluated. In KIc there were no differences between PFPT and conventional porcelain, nor for Hv and Hk, but for the gamma of PFPT calculated from the KIc and the Young modulus measured by the resonance method there was less than that of conventional porcelain. These results indicate that mechanical properties such as KIc and hardness cannot always substantiate the brittleness of PFPT experienced in practical use. However, a comparatively small gamma of PFPT may suggest a fatigue crack growth as a more likely phenomenon as it occurs more easily than the conventional one in oral.