Dentin caries activity status related to hardness and elasticity
Dentin caries activity status related to hardness and elasticity
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DOI：
10.1034/j.1600-0722.2003.00038.x
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发表时间：
2003-06-01
影响因子：
1.9
通讯作者：
Marshall, GW
中科院分区：
文献类型：
--
作者：
Zheng, L;Hilton, JF;Marshall, GW
本研究验证了这样一种假设，即活跃和停滞的龋性牙本质病变具有不同的结构特征，并且在水合冠状面龋性病变中发现的可识别区域的基于原子力显微镜的纳米力学性质不同。本研究使用了8颗龋坏磨牙。通过龋损中心将所有样本纵向平分后，将其分为两个亚组：中度活动性龋和停滞性龋。将样品高度抛光并通过龋齿检测器染色，其允许识别四个区域：粉红色、浅粉红色、透明和明显正常。使用原子力显微镜研究了湿态的机械性能。结果表明，无论活动状态如何，两组均包含相同的区域，并且不同区域具有不同的力学性能。一般来说，对于中度活动性龋，脱矿物质较多的外部区域（粉红色、浅粉红色）较大，并且区域的机械性能较低。对于阻生龋，透明区占据了病变的较大部分，并且降低的弹性模量与下面的正常区没有显著差异，尽管其硬度低于明显的正常区。
This research tested the hypothesis that active and arrested carious dentin lesions have distinct structural characteristics and differ in atomic force microscopy-based nano-mechanical properties of the identifiable zones found in hydrated coronal carious lesions. Eight carious molars were used in this study. After longitudinally bisecting all the samples through the centers of carious lesions, they were divided into two subgroups: moderately active caries and arrested caries. The samples were highly polished and stained by caries detector, which allowed identification of four zones: pink, light pink, transparent and apparently normal. The mechanical properties were studied wet using atomic force microscopy. The results show that both groups contained the same zones, regardless of activity status, and different zones have different mechanical properties. Generally, the more demineralized outer zones (pink, light pink) were larger and the mechanical properties of the zones were lower for moderately active caries. For arrested caries, the transparent zone occupied a larger portion of the lesion and the reduced elastic modulus was not significantly different from the underlying normal zone, although its hardness was lower than the apparently normal zone.