Poggio Claudio, Chiesa Marco, Dagna Alberto, Colombo Marco, Scribante Andrea
Department of Operative Dentistry, University of Pavia, Italy.
Ann Stomatol (Roma). 2012 Jan;3(1):19-23. Epub 2012 May 3.
The purpose of this study was to evaluate the microleakage in Class V cavities restored with a new gingiva-shaded microhybrid composite resin and with a conventional microhybrid composite resin using three different dentin bonding systems (DBS). Class V cavities were prepared in sixty freshly extracted human teeth with the incisal margin in enamel and the apical margin in dentin/cementum. Restored specimens, after thermocycling, were placed in 2% methylene blue solution for 24 hours. Longitudinal sections were obtained and studied with a stereomicroscope for assessment of the microleakage according to degree of dye penetration (scale 0-3). Data were analyzed with Kruskal-Wallis test and with Mann-Whitney U-test.IN THIS STUDY THERE WAS NO LEAKAGE IN ENAMEL: all the cavities showed no dye penetration at the incisal margins (located in enamel). None of the DBS used eliminated microleakage in apical margins (located in dentin or cementum): three-step total-etch and single-step self-etch were more effective in reducing microleakage in dentin margins when compared with two-step total-etch. This in vitro study concluded that microleakage in Class V cavities restored with the composite resins tested is similar.
本研究的目的是使用三种不同的牙本质粘结系统(DBS),评估用新型牙龈色微混合复合树脂和传统微混合复合树脂修复的Ⅴ类洞的微渗漏情况。在60颗新鲜拔除的人牙上制备Ⅴ类洞,切缘位于釉质,根尖缘位于牙本质/牙骨质。修复后的标本经热循环处理后,置于2%亚甲蓝溶液中24小时。获取纵向切片,并用体视显微镜根据染料渗透程度(0-3级)评估微渗漏情况。数据采用Kruskal-Wallis检验和Mann-Whitney U检验进行分析。在本研究中,釉质中无渗漏:所有洞在切缘(位于釉质)处均未显示染料渗透。所用的DBS均未消除根尖缘(位于牙本质或牙骨质)的微渗漏:与两步全酸蚀相比,三步全酸蚀和一步自酸蚀在减少牙本质边缘微渗漏方面更有效。这项体外研究得出结论,用测试的复合树脂修复的Ⅴ类洞的微渗漏情况相似。