Popoff Daniela Araújo Veloso, Gonçalves Fabiana Santos, Magalhães Cláudia Silami, Moreira Allyson Nogueira, Ferreira Raquel Conceição, Mjör Ivar A
College of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Indian J Dent Res. 2011 Nov-Dec;22(6):799-803. doi: 10.4103/0970-9290.94672.
Total replacement is the most common technique for defective amalgam restorations, and it represents a major part of restorative dental treatment. Repair is an alternative option for amalgam restorations with localized defects.
This study compared microleakage of amalgam restorations repaired by bonded amalgam or composite resin.
Thirty extracted human pre-molars were prepared and restored with class I amalgam. A simulated defect was prepared that included the cavosurface margin on restorations, and the pre-molars were assigned to two treatment groups (n=15): In group 1, premolars were treated by composite resin (34% Tooth Conditioner Gel + Adper Single Bond 2 + Z100) and in group 2, premolars were repaired by bonded amalgam (34% Tooth Conditioner Gel + Prime and Bond 2.1 + Permite C). The teeth were immersed in a 50% silver nitrate solution, thermocycled, sectioned longitudinally and then observed by three examiners using a stereomicroscope. Microleakage was evaluated using a 0-4 scale for dye penetration, and data was analyzed by Kruskal Wallis and Dunn tests.
Neither of the two methods eliminated microleakage completely. Composite resin was significantly the most effective for repair/tooth interface sealing (score 0 = 80.0%; P=0.0317). For the repair/restoration interface, composite resin was also statistically more effective as a sealant (score 0=66%; P=0.0005) when compared to the bonded amalgam technique (score 0=13%; P=0.0005).
The use of adhesive systems significantly affected the ability to seal the repair/ tooth interface. However, at the level of the repair/restoration interface, the bonded amalgam technique may increase microleakage.
全冠修复是治疗汞合金修复体缺损最常用的技术，也是牙体修复治疗的主要组成部分。修复是治疗局部缺损汞合金修复体的另一种选择。
本研究比较了用粘结汞合金或复合树脂修复汞合金修复体的微渗漏情况。
选取30颗拔除的人类前磨牙，制备I类汞合金修复体。在修复体上制备一个模拟缺损，包括洞缘斜面，将前磨牙分为两个治疗组（n = 15）：第1组，用复合树脂（34%牙齿调节剂凝胶+单键Adper 2+Z100）治疗前磨牙；第2组，用粘结汞合金（34%牙齿调节剂凝胶+Prime and Bond 2.1+Permite C）修复前磨牙。将牙齿浸泡在50%硝酸银溶液中，进行热循环处理，纵向切片，然后由三名检查者使用体视显微镜观察。使用0 - 4级染料渗透评分评估微渗漏情况，数据采用Kruskal Wallis和Dunn检验进行分析。
两种方法均未完全消除微渗漏。复合树脂在修复体与牙齿界面密封方面显著更有效（评分为0的占80.0%；P = 0.0317）。对于修复体与修复材料界面，与粘结汞合金技术（评分为0的占13%；P = 0.0005）相比，复合树脂作为密封剂在统计学上也更有效（评分为0的占66%；P = 0.0005）。
粘结系统的使用显著影响了修复体与牙齿界面的密封能力。然而，在修复体与修复材料界面水平，粘结汞合金技术可能会增加微渗漏。
