Cenci Maximiliano Sérgio, Piva Evandro, Potrich Fernando, Formolo Elenita, Demarco Flávio Fernando, Powers John M
School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
Braz Dent J. 2004;15(1):13-8. doi: 10.1590/s0103-64402004000100003. Epub 2004 Aug 16.
The aim of this study was to verify the ability of different adhesive materials to prevent microleakage in bonded amalgam restorations. Standard cavities were prepared in both buccal and lingual surfaces of 35 bovine incisors. The gingival wall was located in cementum/dentin and the occlusal wall in enamel. Teeth (n=35) were divided into 5 groups, according to material employed (one glass-ionomer cement, two resin cements, one adhesive system, and Copalex varnish as a control). Following restoration, the teeth were submitted to thermal cycling. The teeth were subsequently immersed in methylene blue dye and sectioned to allow assessment of microleakage. Non-parametric statistical analysis indicated that all materials demonstrated less leakage than the control group (p<0.01). No leakage was found using the resin-modified glass-ionomer cement, which was significantly different from the other adhesive materials (p<0.05). Leakage in enamel was lower than in cementum/dentin margins. It was concluded that bonded amalgam was an effective technique, since all materials prevented microleakage in enamel and cementum/dentin, when compared to the control group, except Panavia in cementum/dentin margins.
本研究的目的是验证不同粘结材料防止汞合金粘结修复体微渗漏的能力。在35颗牛切牙的颊面和舌面制备标准洞形。龈壁位于牙骨质/牙本质，咬合壁位于釉质。根据所使用的材料（一种玻璃离子水门汀、两种树脂水门汀、一种粘结系统以及作为对照的考普莱克斯清漆）将牙齿（n = 35）分为5组。修复后，对牙齿进行热循环处理。随后将牙齿浸入亚甲蓝染料中并切片，以评估微渗漏情况。非参数统计分析表明，所有材料的渗漏均少于对照组（p<0.01）。使用树脂改性玻璃离子水门汀未发现渗漏，这与其他粘结材料有显著差异（p<0.05）。釉质中的渗漏低于牙骨质/牙本质边缘处。得出的结论是，粘结汞合金是一种有效的技术，因为与对照组相比，除了在牙骨质/牙本质边缘处的帕纳维亚材料外，所有材料都能防止釉质和牙骨质/牙本质中的微渗漏。
