| Spatial distribution of the human enamel fracture toughness with aging |
| Zheng QH; Xu HP; Song F(宋凡) ; Zhang L; Zhou XD; Shao YF(邵颖峰); Huang DM; Shao, YF (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China.
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| 发表期刊 | JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
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| 2013-10-01
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| 卷号 | 26页码:148-154 |
| ISSN | 1751-6161
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| 摘要 | A better understanding of the fracture toughness (KIC) of human enamel and the changes induced by aging is important for the clinical treatment of teeth cracks and fractures. We conducted microindentation tests and chemical content measurements on molar teeth from "young" (18 <= age <= 25) and "old" (55 <= age) patients. The KIC and the mineral contents (calcium and phosphorus) in the outer, the middle, and the inner enamel layers within the cuspal and the intercuspal regions of the crown were measured through the Vickers toughness test and Energy Dispersive X-Ray Spectroscopy (EDS), respectively. The elastic modulus used for the KIC calculation was measured through atomic force microscope (AFM)-based nanoindentation tests. In the outer enamel layer, two direction-specific values of the KIC were calculated separately (direction I, crack running parallel to the occlusal surface; direction II, perpendicular to direction I). The mean KIC of the outer enamel layer was lower than that of the internal layers (p<0.05). No other region-related differences in the mechanical properties were found in both groups. In the outer enamel layer, old enamel has a lower KIC, II and higher mineral contents than young enamel (p<0.05). The enamel surface becomes more prone to cracks with aging partly due to the reduction in the interprismatic organic matrix observed with the maturation of enamel. |
| 关键词 | Fracture Toughness
Mechanical Property
Enamel
Aging
Mineral Content
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| 学科领域 | 疲劳与断裂力学
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| URL | 查看原文
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| 收录类别 | SCI
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| 语种 | 英语
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| WOS记录号 | WOS:000322929900016
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| 项目资助者 | National Natural Science Foundation of China [11272226, 11072252, 11023001]
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| 课题组名称 | LNM生物材料微结构和力学性能
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| 论文分区 | 一类
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/47454
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Shao, YF (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China. |
推荐引用方式
GB/T 7714 |
Zheng QH,Xu HP,Song F,et al. Spatial distribution of the human enamel fracture toughness with aging[J]. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,2013,26:148-154.
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| APA |
Zheng QH.,Xu HP.,宋凡.,Zhang L.,Zhou XD.,...&Shao, YF .(2013).Spatial distribution of the human enamel fracture toughness with aging.JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,26,148-154.
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| MLA |
Zheng QH,et al."Spatial distribution of the human enamel fracture toughness with aging".JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 26(2013):148-154.
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