Comparative in vitro microradiographic effects of resin-modified and autopolymerizing glass ionomers on demineralization of primary and permanent enamel.
Comparative in vitro microradiographic effects of resin-modified and autopolymerizing glass ionomers on demineralization of primary and permanent enamel.
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树脂改性和自聚合玻璃离聚物对初级牙釉质和永久牙釉质脱矿的体外显微放射照相效果比较。
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
G. Garcia
中科院分区：
文献类型：
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作者：
A. Wandera;G. Garcia
本研究的目的是比较树脂改性和自聚合玻璃离聚物修复材料对人类初级牙釉质和永久性牙釉质脱矿的体外影响。在随机放置以下材料之前，将 30 个尺寸约为 3 x 4 x 4 毫米的初级和永久牙釉质样本进行切片和平面平行：Photac-Fil，一种树脂改性玻璃离聚物； Ketac-Fil，一种自聚合玻璃离聚物；还有泰廷（Tytin），一种银汞合金。孵育 24 小时后，样品在 pH 5.0 下进行 pH 循环 8 小时，在 pH 7.2 下进行 16 小时，总共两周，均在 37 摄氏度下进行。然后将样本在 pH 5.0 下进行人工龋齿挑战 196 小时。将样本包埋在 Epon 812 中并在 55 摄氏度下孵育三十六小时。从每个样品中制作显微切片并进行显微射线照相和定量显微密度测定。通过双向方差分析和学生纽曼-科伊尔斯配对多重比较测试分析病变深度和矿物质含量的数据。各组之间以及永久牙釉质和初级牙釉质之间的病变深度和矿物质含量存在显着差异（p < 0.05）。这项研究表明，Photac-Fil 和 Ketac-Fil 可在体外不同程度地防止初级牙釉质和永久性牙釉质脱矿。
The purpose of this study was to compare in vitro effects of resin-modified and autopolymerizing glass ionomer restorative materials on demineralization of primary and permanent human enamel. Thirty primary and permanent enamel specimens measuring approximately 3 x 4 x 4 mm were sectioned and plano-paralleled before random placement of materials: Photac-Fil, a resin-modified glass ionomer; Ketac-Fil, an autopolymerizing glass ionomer; and Tytin, a silver amalgam. After incubation for twenty-four hours, the samples were pH cycled for eight hours at pH 5.0 and sixteen hours at pH 7.2 for a total of two weeks, all at 37 degrees C. The specimens were then subjected to an artificial caries challenge at pH 5.0 for 196 hours. The specimens were embeded in Epon 812 and incubated at 55 degrees C for thirty-six hours. Microsections were produced from each sample and subjected to microradiography and quantitative microdensitometry. Data on lesion depth and mineral content were analyzed by Two Way ANOVA and Student Newman-Keuls Pairwise Multiple Comparison tests. There were significant differences in lesion depth and mineral content between groups (p < 0.05) and between permanent and primary enamel. This study demonstrates that Photac-Fil and Ketac-Fil prevent in vitro demineralization at varying levels in primary and permanent enamel.