Use of focused ion beam milling for investigating the mechanical properties of biological tissues: a study of human primary molars.
Use of focused ion beam milling for investigating the mechanical properties of biological tissues: a study of human primary molars.
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使用聚焦离子束铣削研究生物组织的机械性能：人类乳磨牙的研究。
DOI：
10.1016/j.jmbbm.2009.01.006
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发表时间：
2009
影响因子：
3.9
通讯作者：
Nigel M. King
中科院分区：
文献类型：
--
作者：
Y. Chan;A.H.W. Ngan;Nigel M. King
在这篇文章中，证明了聚焦离子束(FIB)在微米尺度的样品成形能力和纳米压痕技术在人类乳牙上的高力分辨率。在牙本质-牙釉质交界处50μm的范围内，用离子轰击球磨制备出宽度为5μm、长10μm的三角形截面的微悬臂梁，并在20μN/S的自由端进行点加载，直到使用纳米压头失败。研究了这种微小的人牙釉质样品的弹性模量和弯曲强度，以及它们在棱柱方向上的变化，并与用纳米压痕和三点弯曲试验测量的大块牙釉质的数据进行了比较。微悬臂梁样品的弹性模量值与块体样品的纳米压痕测试结果相当，但其表现出与釉质微观结构相称的显著各向异性，这是纳米压痕无法在块体样品上测量的。牙釉质微悬臂梁的抗弯强度也表现出很强的各向异性，比三点弯曲法测得的整体试件的抗弯强度高一个数量级。通过威布尔分析，这种强度的尺寸依赖关系被发现类似于脆性材料的正常行为。牙釉质样品的弯曲强度也对样品矿化度的变化很敏感。
In this paper, the usefulness of the specimen shaping ability of focused ion beam (FIB) milling in the micrometer scale and the high force resolution of the nanoindentation technique are demonstrated on human primary teeth. Micro-cantilevers, with a triangular cross-section <5 μm in width and 10 μm in length, were produced within 50 μm of the dentin–enamel junction (DEJ) using FIB milling, and were point-loaded at their free ends at 20 μN/s until failure using a nanoindenter. The elastic modulus and flexural strength of such micro-samples of human enamel, and their variation with respect to prism orientation, were studied and compared to data from bulk enamel measured using nanoindentation and three-point bend tests. The elastic modulus of the micro-cantilever samples was found to be comparable to that obtained by nanoindentation on bulk samples, but it demonstrated significant anisotropy commensurate with the microstructure of enamel which was not measurable using nanoindentation on bulk samples. The flexural strength of the enamel micro-cantilevers also exhibited strong anisotropy, and was about one order of magnitude higher than that of bulk specimens measured by three-point bending. Through a Weibull analysis, this size dependence of the strength was found to be similar to the normal behaviour in brittle materials. The flexural strength of the enamel samples was also found to be sensitive to changes in the degree of mineralization of the samples.
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影响因子：
2.4
作者：
Habelitz, S;Marshall, GW;Marshall, SJ
通讯作者：
Marshall, SJ
棱镜取向对牙釉质拉伸强度的影响。
DOI：
--
发表时间：
2000
期刊：
The journal of adhesive dentistry
影响因子：
--
作者：
Carvalho,RM;Santiago,SL;Fernandes,CA;Suh,BI;Pashley,DH
通讯作者：
Pashley,DH
DOI：
10.1002/jbm.10230
发表时间：
2002-06-05
期刊：
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH
影响因子：
--
作者：
Staninec, M;Marshall, GW;Kinney, JH
通讯作者：
Kinney, JH
影响因子：
3
作者：
Habelitz, S;Marshall, SJ;Balooch, M
通讯作者：
Balooch, M
DOI：
10.1002/1097-4636(200101)54:1
发表时间：
2001-01-01
期刊：
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH
影响因子：
--
作者：
Marshall, GW;Balooch, M;Marshall, SJ
通讯作者：
Marshall, SJ