The effects of ageing on the biomechanical properties of root dentine and fracture.
The effects of ageing on the biomechanical properties of root dentine and fracture.
复制标题
老化对牙根牙本质和断裂生物力学特性的影响。
DOI：
10.1016/j.jdent.2013.11.025
复制
发表时间：
2014
影响因子：
4.4
通讯作者：
Dingming Huang
中科院分区：
文献类型：
--
作者：
Haiping Xu;Q. Zheng;Y. Shao;F. Song;Lan Zhang;Qian Wang;Dingming Huang
目的了解根面牙本质的力学行为有助于更好地理解自发性牙根纵裂（VRF），这是一种主要发生在根尖的年龄相关性疾病。我们测试的假设，根牙本质的生物力学性能的变化与aging.Methods16人前磨牙分为“老”（17-30岁）和“年轻”（50-80岁）组。分别采用原子力显微镜纳米压痕、努氏压痕、扫描电镜和X射线能谱等技术对根颈区、中区和根尖区牙本质的弹性模量、纳米硬度、显微硬度、元素含量、小管密度/面积进行了测量。在两个年龄组中，与颈部牙本质相比，钙磷比较低，管状密度/面积较小，而仅在老年根中观察到显微硬度的空间差异。与年轻牙本质相比，老年牙本质显示出更大的硬度，更高的弹性模量，更大的矿物质含量和更小的管的尺寸在颈部，而年龄引起的管密度的变化不显著。有限元分析表明，由于其较高的弹性模量，老根尖牙本质有一个更高的应力水平比young dentin.ConclusionsThe内在材料性能的根牙本质的空间变化，它们被改变老化。老年人根尖牙本质的应力水平较高可能是老年人更容易发生自发性VRF的原因之一，如果不是最重要的原因的话。
ObjectivesKnowledge 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.MethodsSixteen human premolars were divided into “old” (17–30 years) and “young” (50–80 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.ResultsThe 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.ConclusionsThe 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.
登录
查看更多内容
影响因子：
14
作者：
Porter, AE;Nalla, RK;Ritchie, RO
通讯作者：
Ritchie, RO
影响因子：
2.4
作者：
Habelitz, S;Marshall, GW;Marshall, SJ
通讯作者：
Marshall, SJ
影响因子：
14
作者：
Kinney, JH;Nalla, RK;Ritchie, RO
通讯作者：
Ritchie, RO
DOI：
10.1111/j.1600-9657.1985.tb00653.x
发表时间：
1985-10
期刊：
Endodontics & dental traumatology
影响因子：
--
作者：
D. Pashley;A. Okabe;P. Parham
通讯作者：
D. Pashley;A. Okabe;P. Parham
影响因子：
2.4
作者：
Brauer, Delia S.;Hilton, Joan F.;Marshall, Grayson W.;Marshall, Sally J.
通讯作者：
Marshall, Sally J.