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首页> 外文期刊>Acta biomaterialia >Regulation of enamel hardness by its crystallographic dimensions
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Regulation of enamel hardness by its crystallographic dimensions

机译：通过晶体学尺寸调节搪瓷硬度

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摘要

Enamel is a composite biomaterial comprising a minor organic matrix (～2%) and a hierarchically organized inorganic ultrastructure (～96-98%). Surprisingly, to date there is no available information in the literature regarding the possible role of the enamel ultrastructure on the nanoscale level in tooth macroscopic properties. Understanding this relationship is of especial interest for restorative purposes in dentistry. Accordingly, this study was designed to investigate how enamel nanocrystals regulate its hardness. We performed microindentation analysis on 100 extracted human teeth. The tooth enamel hardness was quantified and correlated with changes in enamel chemical composition and crystallographic dimensions obtained from Fourier transform infrared spectroscopy and X-ray diffraction, respectively. Enamel hardness was not related to the variability in organic content, but was associated with the size of apatite crystals along the c-axis. This association followed the Hall-Petch model for polycrystalline materials, indicating that the optimal size of apatite nanocrystals (larger than the critical size) provides enamel with the greatest hardness, which enables teeth to survive the heavy wear over a human lifetime.
机译：搪瓷是一种复合生物材料，包含少量有机基质（约2％）和层次结构化的无机超微结构（约96-98％）。令人惊讶的是，迄今为止，在文献中没有关于牙釉质超微结构在​​纳米级水平上对牙齿宏观特性的可能作用的可用信息。出于牙科修复的目的，了解这种关系特别有意义。因此，本研究旨在研究搪瓷纳米晶体如何调节其硬度。我们对100颗提取的人类牙齿进行了微压痕分析。量化牙釉质的硬度，并将其与分别通过傅里叶变换红外光谱和X射线衍射获得的牙釉质化学成分和晶体学尺寸的变化相关联。搪瓷硬度与有机物含量的变化无关，但与沿c轴的磷灰石晶体尺寸有关。这种关联遵循多晶材料的Hall-Petch模型，表明磷灰石纳米晶体的最佳尺寸（大于临界尺寸）可提供具有最大硬度的搪瓷，从而使牙齿在人类的整个寿命中都能承受严重的磨损。

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