牙本质
搪瓷漆
材料科学
聚焦离子束
加速电压
透射电子显微镜
牙本质小管
脱盐
扫描电子显微镜
复合材料
断层摄影术
人类牙齿
生物医学工程
电子显微镜
阴极射线
光学
纳米技术
离子
化学
电子
物理
有机化学
医学
量子力学
作者
Jiro Miura,Mizuho Kubo,Tadashi Nagashima,Fumio Takeshige
出处
期刊:Journal of Electron Microscopy
[Oxford University Press]
日期:2012-08-07
卷期号:61 (5): 335-341
被引量:8
标识
DOI:10.1093/jmicro/dfs056
摘要
Human enamel and dentin are hard and brittle mineralized tissues. It is difficult to prepare thin specimens (under 200 nm) of these tissues for transmission electron microscope observation without demineralizing them. We present a novel method of creating three-dimensional ultra-structural images of human enamel and dentin, using the focus ion beam (FIB) method and ultra-high-voltage electron microscope tomography. Thin specimens (less than 2 μm) of enamel and dentin were prepared using the FIB method. This method is appropriate for nano-fabrication of thin specimens for brittle materials such as enamel and dentin. It allows penetration of an ultra-high-voltage electron beam of a 3000 kV maximal acceleration voltage into a specimen, enabling projections of the specimen to be taken. It facilitates tomography of the enamel rods, sheaths, dentinal tubules and collagen fibrils with a high resolution of 2 nm. The component percentages in ultra-structures of dentin can be expressed numerically by using three-dimensional reconstruction images of tomograms. The matrix of peritubular dentin differed from that of intertubular dentin by having relatively fewer collagen fibrils. The major advantage of this method is its ability to visualize ultra-structural tomograms of highly calcified specimens without demineralization.
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