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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.
Source PublicationJournal of Dentistry
2014-03
Volume42Issue:3Pages:305-311
ISSN0300-5712
AbstractObjectives: 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.
KeywordDislocations Free Surface Complex Potential Method Coupling Interaction Simple Approximate Solution
Subject AreaDentistry ; Oral Surgery & Medicine
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Indexed BySCI
Language英语
WOS IDWOS:000332414000011
Funding OrganizationThis 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.
DepartmentLNM生物材料微结构和力学性能
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48785
Collection非线性力学国家重点实验室
Corresponding AuthorHuang, DM (reprint author), Sichuan Univ, West China Sch Stomatol, 14,3rd Sect, Chengdu 610041, Sichuan, Peoples R China.
Recommended Citation
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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