Pin Maria Ligia Gerdullo, Abdo Ruy Cesar Camargo, Machado Maria Aparecida de Andrade Moreira, da Silva Salete Moura Bonifácio, Pavarini Aymar, Marta Sara Nader
Department of Pediatric Dentistry, School of Dentistry, Universidade Paulista, Bauru, SP, Brazil.
Oper Dent. 2005 May-Jun;30(3):368-75.
Considering that caries around restorations is a serious problem in dentistry, and some restorative materials with fluoride may be important in inhibiting these lesions, this research is aimed at performing an in vitro evaluation of the cariostatic action of some esthetic restorative materials. Standardized cavities were prepared in the center of either intact blocks of bovine enamel or with bovine teeth containing early artificial carious lesions. The specimens were restored with a high viscosity glass ionomer cement (Molar Ketac), a resin-modified glass ionomer cement (Vitremer), a polyacid-modified resin composite (Dyract AP) and a conventional resin composite (Z-250). In addition to the restored specimens, four corresponding control groups were evaluated. All groups, except for two control groups, were subjected to a demineralization/remineralization cycling model for 14 days, simulating a situation of severe cariogenic challenge. The blocks were then longitudinally sectioned through the restorations. Mineral loss was evaluated in these specimens using the Knoop microhardness profiles in longitudinal sections at three different distances of the cavities and at eight distinct depths in relation to the external enamel surface. Statistical analysis of the results showed significant differences (p < 0.05) among the groups, although none of the study materials completely inhibited creation of the lesions. Vitremer demonstrated the best cariostatic action in intact bovine enamel. Ketac Molar, in intact or demineralized enamel, and Vitremer, in demineralized enamel, presented intermediate cariostatic potential. Z-250 and Dyract AP did not demonstrate any cariostatic effect. The data suggests that glass ionomer cements demonstrated better cariostatic action compared to the other restorative materials.
鉴于修复体周围龋病是牙科领域的一个严重问题，且一些含氟修复材料在抑制这些病变方面可能具有重要作用，本研究旨在对一些美学修复材料的防龋作用进行体外评估。在完整的牛牙釉质块中心或含有早期人工龋损的牛牙上制备标准化洞型。用高粘性玻璃离子水门汀（Molar Ketac）、树脂改性玻璃离子水门汀（Vitremer）、聚酸改性树脂复合材料（Dyract AP）和传统树脂复合材料（Z - 250）对标本进行修复。除修复后的标本外，还评估了四个相应的对照组。除两个对照组外，所有组均经历14天的脱矿/再矿化循环模型，模拟严重致龋挑战的情况。然后将这些块体沿修复体纵向切开。使用努氏显微硬度剖面图在洞型的三个不同距离以及相对于外釉质表面的八个不同深度处评估这些标本中的矿物质损失。结果的统计分析表明，各组之间存在显著差异（p < 0.05），尽管没有一种研究材料能完全抑制病变的产生。Vitremer在完整的牛牙釉质中表现出最佳的防龋作用。Ketac Molar在完整或脱矿的牙釉质中，以及Vitremer在脱矿牙釉质中，表现出中等的防龋潜力。Z - 250和Dyract AP未显示出任何防龋效果。数据表明，与其他修复材料相比，玻璃离子水门汀表现出更好的防龋作用。
