| The effects of ageing on the biomechanical properties of root dentine and fracture | |
Xu, HP; Zheng, QH; Shao YF(邵颖峰) ; Song F(宋凡); Zhang, L; Wang, Q; Huang, DM; Huang, DM (reprint author), Sichuan Univ, West China Sch Stomatol, 14,3rd Sect, Chengdu 610041, Sichuan, Peoples R China.
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| 发表期刊 | Journal of Dentistry
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| 2014-03 | |
| 卷号 | 42期号:3页码:305-311 |
| ISSN | 0300-5712 |
| 摘要 | Objectives: Knowledge of the mechanical behaviour of root dentine can facilitate better understanding of spontaneous vertical root fracture (VRF), an age-related disease initiated mainly at the root apex. We tested the hypothesis that the biomechanical properties of root dentine change with ageing. Methods: Sixteen human premolars were divided into "old'' (17-30 years) and "young'' (5080 years) groups. The elastic modulus, nano-hardness, micro-hardness, elemental contents, tubular density/area of root dentine in cervical, middle and apical root regions were evaluated using atomic force microscopy-based nano-indentation, Knoop indentation, scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Results: The apical dentine showed a lower nano-hardness, a lower elastic modulus, a lower calcium content, a lower calcium-to-phosphorus ratio and a smaller tubular density/area than the cervical dentine in both age groups, whereas spatial differences in micro-hardness were observed only in old roots. Compared with young dentine, old dentine showed a greater hardness, a higher elastic modulus, a greater mineral content and a smaller tubular size in the cervical portion, whereas the age-induced changes in tubular density were insignificant. Finite element analysis revealed that due to its higher elastic modulus, old apical dentine has a higher stress level than young dentine. Conclusions: The intrinsic material properties of root dentine have spatial variations, and they are altered by ageing. The higher stress level in old apical dentine may be one reason, if not the most important one, why spontaneous VRFs are more likely to occur in the elderly population. (C) 2013 Elsevier Ltd. All rights reserved. |
| 关键词 | Dislocations Free Surface Complex Potential Method Coupling Interaction Simple Approximate Solution |
| 学科领域 | Dentistry ; Oral Surgery & Medicine |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000332414000011 |
| 项目资助者 | This study was supported by the National Natural Science Foundation of China (11272226, 11072252, 11023001 and 11102208). All of the authors declare that they have no conflicts of interest. |
| 课题组名称 | LNM生物材料微结构和力学性能 |
| 论文分区 | 一类 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/48785 |
| 专题 | 非线性力学国家重点实验室 |
| 通讯作者 | Huang, DM (reprint author), Sichuan Univ, West China Sch Stomatol, 14,3rd Sect, Chengdu 610041, Sichuan, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Xu, HP,Zheng, QH,Shao YF,et al. The effects of ageing on the biomechanical properties of root dentine and fracture[J]. Journal of Dentistry,2014,42,3,:305-311. |
| APA | Xu, HP.,Zheng, QH.,Shao YF.,Song F.,Zhang, L.,...&Huang, DM .(2014).The effects of ageing on the biomechanical properties of root dentine and fracture.Journal of Dentistry,42(3),305-311. |
| MLA | Xu, HP,et al."The effects of ageing on the biomechanical properties of root dentine and fracture".Journal of Dentistry 42.3(2014):305-311. |
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