Nano- and micromechanical properties of dentine: Investigation of differences with tooth side.
Nano- and micromechanical properties of dentine: Investigation of differences with tooth side.
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DOI：
10.1016/j.jbiomech.2011.03.004
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发表时间：
2011-05-17
影响因子：
2.4
通讯作者：
Marshall, Sally J.
中科院分区：
文献类型：
--
作者：
Brauer, Delia S.;Hilton, Joan F.;Marshall, Grayson W.;Marshall, Sally J.
关键词：
牙本质-釉质交界处的软区被认为在咀嚼过程中对牙齿的功能、应变分布和抗折强度起重要作用。最近报道的机械性能与齿侧的不对称性可能指向牙齿功能的基本属性。我们研究的目的是测试这种不对称性是否反映在牙本质的纳米和微观力学性能。我们采用纳米和微米压痕技术研究了9颗离体牙颊舌侧牙本质的力学性能。在自然对数标度上分析性质，使用最大似然法估计参数。双侧0.05水平似然比检验被用来评估表面（颊与舌）和牙本质深度的影响，测量从冠牙本质的DEJ和根牙本质的CDJ。结果表明，众所周知的机械性能随着距离DEJ的增加而逐渐增加。冠状牙本质显示出较高的弹性模量和硬度的舌侧牙齿的所有测量，而根牙本质是更难的颊侧。由于这些影响的微妙性和研究的牙齿数量少，结果未能达到统计学意义。结果表明，牙本质的纳米和微观力学性能随牙侧的协议与最近的文献使用宏观方法。冠、根牙本质的颊舌硬度比方向相反，具有代偿功能。
The soft zone in dentine beneath the dentino-enamel junction is thought to play an important role in tooth function, strain distribution and fracture resistance during mastication. Recently reported asymmetry in mechanical properties with tooth side may point at a basic property of tooth function. The aim of our study was to test if this asymmetry was reflected in the nano- and micromechanical properties of dentine. We investigated the mechanical properties of dentine on the buccal and lingual side of nine extracted human teeth using nano- and microindentation. Properties were analysed on the natural log scale, using maximum likelihood to estimate the parameters. Two-sided 0.05-level likelihood ratio tests were used to assess the influences of surface (buccal versus lingual) and dentine depth, measured from the DEJ in crown dentine and from the CDJ in root dentine. Results showed the well known gradual increase in mechanical properties with increasing distance from the DEJ. Coronal dentine showed higher elastic modulus and hardness on the lingual side of teeth for all measurements, while root dentine was harder on the buccal side. Due to the subtlety of these effects and the small number of teeth studied, results failed to reach statistical significance. Results suggest that dentine nano- and micromechanical properties vary with tooth side in agreement with recent literature using macroscopic methods. They also reveal that buccal-lingual ratios of hardness are in opposite directions in crown and root dentine, suggesting compensatory functions.
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影响因子：
2.4
作者：
Habelitz, S;Marshall, GW;Marshall, SJ
通讯作者：
Marshall, SJ
影响因子：
3
作者：
Zaslansky, P;Friesem, AA;Weiner, S
通讯作者：
Weiner, S
影响因子：
5
作者：
Wood, JD;Wang, RZ;Pashley, DH
通讯作者：
Pashley, DH
影响因子：
3
作者：
Kinney, JH;Balooch, M;Marshall, SJ
通讯作者：
Marshall, SJ
DOI：
10.1111/j.1151-2916.2000.tb01181.x
发表时间：
2000-01-01
影响因子：
3.9
作者：
White, SN;Paine, ML;Snead, ML
通讯作者：
Snead, ML