Micro-mechanical characterisation of the properties of primary tooth dentine
Micro-mechanical characterisation of the properties of primary tooth dentine
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DOI：
10.1016/s0300-5712(03)00045-9
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发表时间：
2003-05-01
影响因子：
4.4
通讯作者：
Kilpatrick, N
中科院分区：
文献类型：
--
作者：
Angker, L;Swain, MV;Kilpatrick, N
Objective.了解牙本质的机械性能是非常重要的，因为粘结修复材料主要通过牙本质实现与牙齿结构的粘结。目前的研究测量的硬度和弹性模量的乳磨牙牙本质使用的超微压痕系统（UMIS），它允许牙本质保持水合，因此被认为是更接近在体内的条件。对8颗健康乳磨牙进行轴向切片，树脂包埋并精细抛光。在25 mN的力负荷下，在冠状牙本质上从牙髓窝到牙本质-釉质连接处（DEJ）平行于小管方向做两个线性阵列的压痕。离髓壁最近的牙本质的平均硬度和弹性模量分别为0.52 ± 0.24和11.59 ± 3.95 GPa，明显低于中间区的牙本质（0.85 ± 0.19和17.06 ± 3.09 GPa）和离DEJ最近的牙本质，分别为0.91 ± 0.15和16.33 ± 3.83 GPa。硬度与弹性模量之间存在显著的线性相关性。牙本质的硬度和弹性模量随离牙髓距离的减小而减小。这对临床医生来说很重要，因为向牙髓延伸的洞制备可能会导致修复体的机械支撑减少。(C)2003爱思唯尔科技有限公司版权所有。
Objective. Understanding the mechanical properties of dentine is of importance as adhesive restorative materials mainly achieve their bonding to the tooth structure through dentine. The current study measures the hardness and modulus of elasticity of primary molar dentine using an Ultra-Micro-indentation System (UMIS), which allows the dentine to remain hydrated and thus is assumed to be closer to the in vivo conditions.Methods. Eight sound primary molar teeth were axially sectioned, embedded in resin and fine polished. Two linear arrays of indentations were done on coronal dentine, from the pulp watt to dentino-enamel junction (DEJ) parallel to the tubule direction under a force load of 25 mN.Results. The mean hardness and elastic modulus of the dentine nearest the pulp wall was 0.52 +/- 0.24 and 11.59 +/- 3.95 GPa, respectively, which was significantly tower than those of dentine in the middle area, which was 0.85 +/- 0.19 and 17.06 +/- 3.09 GPa, respectively, and the dentine nearest DEJ, which was 0.91 +/- 0.15 and 16.33 +/- 3.83 GPa, respectively. There is a statistically significant linear correlation between the hardness and modulus of elasticity.Conclusion. The hardness and modulus of elasticity of dentine decreases with decreasing distance from the pulp. This is of importance to clinicians because an extension of cavity preparation towards the pulp may Lead to Less mechanical support for a restoration. (C) 2003 Elsevier Science Ltd. All rights reserved.