Depth-resolved Raman microprobe examination of a commercial dental porcelain exposed to a simulated oral environment.
Depth-resolved Raman microprobe examination of a commercial dental porcelain exposed to a simulated oral environment.
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对暴露于模拟口腔环境的商用牙瓷进行深度分辨拉曼微探针检查。
DOI：
10.1016/s0109-5641(99)00009-3
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
O'Brien,WJ
中科院分区：
文献类型：
--
作者：
Jestel,NL;Morris,MD;O'Brien,WJ
ObjectiveTheSpecific aims were investigationof the chemical transformations of the chemical transformations into the interior of a commercial dental ceramic upon exposure to a simulated oral environment and identification of structure alterations that contribute to the strengthening of the ceramics.MethodsSamples of a commercial dental ceramic，Duceram LFC，were exposed to 10% dilute acetic acid for 0，1，5，10，和72小时以模拟暴露于口腔环境。使用深度分辨拉曼微探针系统检查对照和回流样品，该系统覆盖低（0 - 2550 cm-1）和高（2000 - 4000 cm-1）频率范围。使用探索性因子分析处理谱。保留显着的因素，占99.999%的variance.ResultsThe瓷被发现是显着解聚酸处理前。暴露于水和酸导致在表面附近形成更好的有序区域。在该地区，三个混合区链状偏硼酸盐和焦硼酸盐，硼氧环，硼酸盐和硅酸盐四面体的混合物被确定。硼酸盐/硅酸盐因子依赖于老化时间。在所有样品中均检测到羟基，但直到放置10小时或更长时间后才注意到羟基环境的变化。然后，检测分子水和分离的羟基/SiOH。72h后，在2800 - 2950cm-1附近有一个未分配因子。
ObjectivesThe specific aims were investigation of the chemical transformations of the chemical transformations into the interior of a commercial dental porcelain upon exposure to a simulated oral environment and identification of structural alterations that contribute to the strengthening of the porcelain.MethodsSamples of a commercial dental porcelain, Duceram LFC, were exposed to refluxing dilute acetic acid for 0, 1, 5, 10, and 72h to simulate exposure to the oral environment. The control and refluxed samples were examined using a depth-resolved Raman microprobe system covering the low (0–2550cm−1) and high (2000–4000cm−1) frequency ranges. Spectra were processed using exploratory factor analysis. Significant factors were retained, accounting for 99.999% of the variance.ResultsThe porcelain was found to be significantly depolymerized prior to acid-refluxing. Exposure to water and to acid resulted in the formation of a better-ordered region near the surface. In that region, three intermingled zones of chainlike metaborate and pyroborate, of boroxol rings, and of a mixture of borate and silicate tetrahedra were identified. The borate/silicate factor was dependent on refluxing time. Hydroxyl groups were detected in all of the samples, but no changes to the hydroxyl environment were noted until after 10 or more hours of refluxing. Then, molecular water and isolated hydroxyls/SiOH were detected. After 72h, an additional unassigned factor around 2800–2950cm−1was noted.SignificanceAcid refluxing causes generation of ordered boron-containing species near the surface ogf the porcelain.
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1980
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发表时间：
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影响因子：
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作者：
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