Zhang Dong-Sheng, Lu Cheng-Lin
Department of Mechanics, Shanghai University, Shanghai 200444, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2007 Dec;42(12):733-6.
To study the influence of moisture on the mechanical behavior of human dentin and fracture mechanism with crack extension in dentin.
A loading system that was suitable for biological materials was presented in this paper. With the help of digital image correlation (DIC), the surface deformation of wet samples was analyzed. Miniature compact tensile specimens were made from molars extracted from human beings. The fracture mechanism of human dentin was studied with compact tension (CT).
Hydrated dentin behaved like visco-elastic material while dehydrated dentin became brittle. The bridged tissue behind the crack tip and the blunting effect at the crack tip resisted the extension of crack in dentin.
Hydration plays an important role in mechanical properties of dentin. Dentin tissue has the ability to resist within extension of crack, however this ability decreases with aging.
研究水分对人牙本质力学行为的影响以及牙本质中裂纹扩展的断裂机制。
本文提出了一种适用于生物材料的加载系统。借助数字图像相关技术（DIC），分析了湿样品的表面变形。微型紧凑拉伸试样由从人类拔除的磨牙制成。采用紧凑拉伸（CT）研究人牙本质的断裂机制。
水合牙本质表现得像粘弹性材料，而脱水牙本质则变脆。裂纹尖端后方的桥接组织和裂纹尖端的钝化效应阻碍了牙本质中裂纹的扩展。
水合作用在牙本质力学性能中起重要作用。牙本质组织具有抵抗裂纹扩展的能力，然而这种能力会随着年龄增长而降低。
