Ferreira M C, Vieira R S
Dra. Meire Coelho Ferreira, Rua Doze, 648, Ilha dos Araújos, 35020-690 Governador Valadares-MG, Brazil.
J Dent. 2008 May;36(5):322-5. doi: 10.1016/j.jdent.2008.01.016. Epub 2008 Mar 11.
The aim of this study was to evaluate the marginal leakage in class II preparations, with margins in enamel, restored with composite resin indirect and direct restorations.
Twenty extracted primary molars were chosen and divided at random into two groups: G1 (n=10) restored by a direct technique and G2 (n=10) restored by an indirect technique. The composite resin Filtek Z250 (3M) and the Adper Single Bond adhesive (3M) were used in both groups. Teeth were stored in a humid environment at 37 degrees C for 1 week, thermo cycled (500 cycles, 5 degrees C and 55 degrees C), sealed and immersed in a 0.5% basic fuchsine dye for 24h. Teeth were longitudinally sectioned, in a mesio-distal direction and leakage was assessed.
No leakage in the specimens from G2 and leakage in four specimens from G1, but the Mann-Whitney test showed that there was no statistically significant difference between the groups, either for occlusal box (p=0.317) and proximal box (p=0.067).
This study demonstrated that direct and indirect class II composite resin restorations with cervical margins in enamel show similar results regarding marginal leakage.
本研究旨在评估Ⅱ类洞型修复体边缘位于牙釉质处，采用复合树脂间接和直接修复时的边缘微渗漏情况。
选取20颗拔除的乳牙，随机分为两组：G1组（n = 10）采用直接技术修复，G2组（n = 10）采用间接技术修复。两组均使用复合树脂Filtek Z250（3M公司）和Adper Single Bond粘结剂（3M公司）。牙齿在37℃潮湿环境中保存1周，进行热循环（500次循环，5℃和55℃），密封后浸入0.5%碱性品红染料中24小时。沿近远中方向对牙齿进行纵向切片，评估微渗漏情况。
G2组标本无微渗漏，G1组有4个标本出现微渗漏，但曼-惠特尼检验显示，两组在咬合面盒（p = 0.317）和邻面盒（p = 0.067）方面均无统计学显著差异。
本研究表明，边缘位于牙釉质的Ⅱ类复合树脂直接和间接修复体在边缘微渗漏方面结果相似。
