This study aimed to test the hypothesis that organic volume is the main variable for explaining the optical properties and predictive degree of diffusion of enamel histological points at zones of natural enamel caries (NEC; surface layer, SL, n = 30, and body of the lesion, BL, n = 58) and normal enamel (NE, n = 131). Molars with either NEC or NE were quantitatively analyzed regarding the mineral, organic and water volumes (considered as effective pore volume), opacity (predicted in 94% of cases by water volume in NEC), and water volume more easily available for diffusion, αd (squared water volume divided by the nonmineral volume; related to permeability). NEC presented lower mineral volumes and higher organic volumes, effective pore volume and opacity than NE. External origin of organic volume in NEC was evidenced by an organic gradient decreasing from the surface inward (R2 = -0.7), which was not detected in teeth with NE only; αd values of the SL and NE were similar and both were lower (p < 0.0001) than that of the BL. Comparing the SL from both NEC and artificial enamel caries (AEC; published data; n = 71), with similar mineral volumes, against developing enamel (published data), AEC showed more effective pore volume (3 times higher), higher αd and opacity than NEC mainly due to differences in organic volumes. Our results reasonably matched widely known features of NEC histological zones, and confirmed the organic volume as the main variable for explaining optical properties and αd (related to permeability).

译文

这项研究旨在检验以下假设: 有机体积是解释自然牙釉质龋 (NEC; 表面层,SL,n = 30) 和身体的光学特性和牙釉质组织学点扩散的预测程度的主要变量。病变,BL,n = 58) 和正常釉质 (NE,n = 131)。对具有NEC或NE的磨牙进行了定量分析,涉及矿物质,有机物和水的体积 (被认为是有效的孔隙体积),不透明度 (在94% 情况下由NEC中的水量预测) 以及更易于扩散的水量 α d (平方水体积除以非矿物质体积; 与渗透率相关)。NEC表现出比NE更低的矿物体积和更高的有机体积,有效孔体积和不透明度。NEC中有机体积的外部来源通过从表面向内减小的有机梯度 (R2 = -0.7) 来证明,这仅在具有NE的牙齿中没有检测到; SL和NE的 α d值相似,并且均低于BL (p <0.0001)。将具有相似矿物体积的NEC和人造牙釉质龋 (AEC; 已发布数据; n = 71) 的SL与正在开发的牙釉质 (已发布数据) 进行比较,AEC显示出更有效的孔体积 (高3倍),更高的 α d和不透明度比NEC主要是由于有机体积的差异。我们的结果合理地匹配了NEC组织学区域的众所周知的特征,并确认了有机体积是解释光学特性和 α d (与渗透率有关) 的主要变量。

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