The effects of ageing on the biomechanical properties of root dentine and fracture

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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
刊名	Journal of Dentistry
	2014-03
通讯作者邮箱	shaoyf@lnm.imech.ac.cn; dingminghuang@163.com
卷号	42 期号:3 页码:305-311
关键词	Dislocations Free surface Complex potential method Coupling interaction Simple approximate solution
ISSN号	0300-5712
通讯作者	Huang, DM (reprint author), Sichuan Univ, West China Sch Stomatol, 14,3rd Sect, Chengdu 610041, Sichuan, Peoples R China.
产权排序	[Xu, Haiping; Zheng, Qinghua; Zhang, Lan; Wang, Qian] Sichuan Univ, West China Hosp Stomatol, State Key Lab Oral Dis, Chengdu 610041, Sichuan, Peoples R China; [Shao, Yingfeng; Song, Fan] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Huang, Dingming] Sichuan Univ, West China Sch Stomatol, Dept Conservat Dent & Endodont, Chengdu 610041, Sichuan, Peoples R China
合作状况	国内
中文摘要	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.
学科主题	Dentistry ; Oral Surgery & Medicine
分类号	一类
收录类别	SCI
资助信息	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.
原文出处	http://dx.doi.org/10.1016/j.jdent.2013.11.025
语种	英语
WOS记录号	WOS:000332414000011
公开日期	2014-05-09
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/48785]
专题	力学研究所_非线性力学国家重点实验室
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.