Rasmussen S T, Patchin R E
J Dent Res. 1984 Dec;63(12):1362-8. doi: 10.1177/00220345840630120501.
SEM fractography and work-of-fracture techniques were used to investigate the fracture properties of human enamel and dentin as a function of the temperature of an aqueous environment. Both enamel and dentin were found to be anisotropic with respect to mechanical failure but were found to have little variation in fracture properties with respect to temperatures from 0 degree to 70 degrees C. Fractographs of a naturally fractured tooth were consistent with experimental findings. The results of this research indicate that natural fracturing of teeth probably cannot be explained on the basis of a reduced work of fracture resulting from chewing hot or cold foods. It was also shown that if dentin surfaces can be kept below 100 degrees C during cavity preparation, the restored tooth will not be weakened by an irreversible reduction of its work of fracture.
采用扫描电子显微镜断口分析和断裂功技术，研究了作为水环境温度函数的人牙釉质和牙本质的断裂特性。发现牙釉质和牙本质在机械破坏方面均表现为各向异性，但在0摄氏度至70摄氏度的温度范围内，其断裂特性几乎没有变化。一颗自然折断牙齿的断口照片与实验结果一致。本研究结果表明，牙齿的自然折断可能无法基于咀嚼热食或冷食导致断裂功降低来解释。研究还表明，如果在制备窝洞期间牙本质表面能够保持在100摄氏度以下，修复后的牙齿不会因断裂功的不可逆降低而变弱。
