Water content and apparent stiffness of non-caries versus caries-affected human dentin
Water content and apparent stiffness of non-caries versus caries-affected human dentin
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DOI：
10.1002/jbm.b.30130
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发表时间：
2005-01-15
影响因子：
3.4
通讯作者：
Pashley, DH
中科院分区：
文献类型：
--
作者：
Ito, S;Saito, T;Pashley, DH
龋齿影响的牙本质比周围正常牙本质含有更少的矿物质和更多的水。这样的牙本质应该不那么坚硬，并且在干燥时应该比正常牙本质收缩得更多。本研究的目的是测试的刚度之间的关系，收缩，和水含量的龋影响与正常牙本质。提取的人龋坏第三磨牙用龋齿检测染料染色，咬合面研磨，直到只有龋齿影响的牙本质仍然存在，周围是正常的牙本质。牙本质盘由放置在铝井中的这些牙冠制备，所述铝井定位在改进的热机械分析仪下。在干燥或静态加载后，在受龋影响的和周围正常牙本质中测量样本高度和刚度的变化。这两种类型的牙本质的核心样本被用来重量法测量含水量。使用双因素方差分析和回归分析来检验收缩率与含水量、刚度与含水量以及刚度与收缩率之间的关系。龋坏组牙本质的硬度和含水量均低于正常组（P < 0.05）。回归分析显示，刚度和含水量之间以及刚度和收缩率之间存在非常显著的负相关关系（p < 0.0005）。(C)2004 Wiley Periodicals，Inc.
Caries-affected dentin contains less mineral and more water than surrounding normal dentin. Such dentin should be less stiff and should shrink more than normal dentin when dried. The purpose of this study was to test the relationships between the stiffness, shrinkage, and water content of caries-affected versus normal dentin. Extracted human carious third molars were stained with caries-detector dye and the occlusal surfaces ground down until only caries-affected dentin remained, surrounded by normal dentin. Dentin disks were prepared from these crowns placed in a aluminum well positioned under a modified thermal mechanical analyzer. Changes in specimen height and stiffness were measured following drying or static loading in both caries-affected and surrounding normal dentin. Core samples of these two types of dentin were used to gravimetrically measure water content. Two-way ANOVA and regression analysis was used to test the relationship between shrinkage versus water content, stiffness versus water content, and stiffness versus shrinkage. Caries-affected dentin was found to be less stiff and contained more water than normal dentin (p < 0.05). Regression analysis revealed highly significant inverse relationships between stiffness and water content, and stiffness and shrinkage (p < 0.0005). (C) 2004 Wiley Periodicals, Inc.