Ultimate tensile strength of dentin: Evidence for a damage mechanics approach to dentin failure
Ultimate tensile strength of dentin: Evidence for a damage mechanics approach to dentin failure
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DOI：
10.1002/jbm.10230
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发表时间：
2002-06-05
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影响因子：
--
通讯作者：
Kinney, JH
中科院分区：
文献类型：
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作者：
Staninec, M;Marshall, GW;Kinney, JH
已知牙本质结构和性质随取向和位置而变化。本研究探讨了牙本质的极限拉伸强度（UTS）的变化与位置在牙齿。沙漏标本制备牙本质位于中心，下尖，并在人类磨牙颈部区域。这些在离纸浆不同距离处进行张力测试。中位抗张强度范围为44.4 MPa（牙髓附近的内牙本质）至97.8 MPa（牙本质-釉质交界处（DEJ）附近）。中位UTS随牙髓至DEJ距离的增加具有统计学显著性（P <0.001）。特别重要的是观察到UTS测量值遵循威布尔概率分布，威布尔模量约为4.5。UTS数据的威布尔行为强烈表明，断裂强度数据的大方差是牙本质中预先存在的缺陷分布的结果。这些发现证明了牙本质破坏的损伤力学研究方法。(C)2002 Wiley Periodicals，Inc.
Dentin structure and properties are known to vary with orientation and location. The present study explored the variation in the ultimate tensile strength (UTS) of dentin with location in the tooth. Hourglass specimens were prepared from dentin located in the center, under cusps, and in the cervical regions of human molar teeth. These were tested in tension at various distances from the pulp. Median tensile strengths ranged from 44.4 MPa in the inner dentin near the pulp, to 97.8 MPa near the dentino-enamel junction (DEJ). This increase in the median UTS with distance from the pulp to the DEJ was statistically significant (P < .001). Of particular importance was the observation that the UTS measurements followed a Weibull probability distribution, with a Weibull modulus of about 4.5. The Weibull behavior of the UTS data strongly suggests that the large variances in fracture strength data result from a distribution of preexisting defects in the dentin. These findings justify a damage-mechanics approach to studies of dentin failure. (C) 2002 Wiley Periodicals, Inc.