Fatigue and tensile properties of radicular dentin substrate
Fatigue and tensile properties of radicular dentin substrate
复制标题
根基牙本质基质的疲劳和拉伸性能
DOI：
10.1016/j.jbiomech.2010.11.025
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发表时间：
2011
影响因子：
2.4
通讯作者：
Miyazaki T
中科院分区：
文献类型：
--
作者：
Inoue T;Nishimura F;Debari K;Kou K;Miyazaki T
本研究的目的是比较根面牙本质的疲劳强度和抗拉强度。使用40个牛下中切牙，20个牙齿用于疲劳测试，20个牙齿用于拉伸测试。将牛牙齿分别切成冠状和根状部分。使用低速切割机沿牙根制备沿着1 mm厚的牙本质板，并将其修剪成哑铃形试样。从每颗牙齿上采集牙本质板。随后，在37°C的Hank平衡盐溶液中进行疲劳和拉伸试验。采用阶梯法确定疲劳强度及其标准差。通过扫描电子显微镜观察断裂表面。平均疲劳强度和拉伸强度分别为44.3±5.0和84.4±8.3MPa。根面牙本质的疲劳强度明显低于抗拉强度。根面牙本质的疲劳强度约为抗拉强度的一半。
The purpose of this study was to compare the fatigue and tensile strengths of radicular dentin. Forty bovine lower central incisors were used, twenty teeth for the fatigue test and twenty teeth for the tensile test. Bovine teeth were each sectioned into coronal and radicular portions. Dentin slabs of 1mm thickness were prepared along the radicular tooth using a low-speed cutting machine and trimmed into dumbbell-shaped specimens. A dentin slab was harvested from each tooth. Subsequently, fatigue and tensile tests were performed in Hank's balanced saline solution at 37°C. The staircase method was employed to determine fatigue strength and its standard deviation. Fracture surfaces were observed by scanning electron microscopy. Mean fatigue strength and tensile strength were 44.3±5.0 and 84.4±8.3MPa, respectively. The fatigue strength of radicular dentin was significantly lower than the tensile strength. The fatigue strength of radicular dentin was only approximately one half of the tensile strength.