Hardness and Young's modulus of human peritubular and intertubular dentine
Hardness and Young's modulus of human peritubular and intertubular dentine
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DOI：
10.1016/0003-9969(95)00109-3
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发表时间：
1996-01-01
影响因子：
3
通讯作者：
Weihs, TP
中科院分区：
文献类型：
--
作者：
Kinney, JH;Balooch, M;Weihs, TP
使用专门改装的原子力显微镜测量未萌出的人类第三磨牙内两个位置完全水合的管周和管间牙本质的硬度：牙本质-牙釉质交界处1 mm内和牙髓1 mm内。完全水化的管周牙本质的硬度是独立的位置，范围从2.23到2.54 GPa。完全水合的管间牙本质的硬度确实取决于位置，并且在牙本质-釉质接合处附近（值范围为0.49 - 0.52 GPa）比在牙髓附近（0.12-0.18 GPa）显著更大。使用Nanindenter从载荷位移曲线的卸载部分估计脱水的管周和管间牙本质的杨氏模量。管周牙本质的模量值平均为29.8 GPa（被认为是下限），管间牙本质的模量值范围为17.7 - 21.1 GPa，牙髓附近的牙本质的模量值较低。
A specially modified atomic-force microscope was used to measure the hardness of fully hydrated peritubular and intertubular dentine at two locations within unerupted human third molars: within 1 mm of the dentine-enamel junction and within 1 mm of the pulp. The hardness of fully hydrated peritubular dentine was independent of location, and ranged from 2.23 to 2.54 GPa. The hardness of fully hydrated intertubular dentine did depend upon location, and was significantly greater near the dentine-enamel junction (values ranged from 0.49 to 0.52 GPa) than near the pulp (0.12-0.18 GPa). A Nanoindenter was used to estimate the Young's modulus of dehydrated peritubular and intertubular dentine from the unloading portion of the load displacement curve. The modulus values averaged 29.8 GPa for the peritubular dentine (considered to be a lower limit), and ranged from 17.7 to 21.1 GPa for the intertubular dentine, with the lower values obtained for dentine near the pulp.