Dutton F B, Summitt J B, Chan D C, Garcia-Godoy F
Department of Restorative Dentistry, University of Texas Health Science Center, San Antonio 78284-7890.
J Dent. 1993 Feb;21(1):52-6. doi: 10.1016/0300-5712(93)90052-r.
This in vitro study compared microleakage in Class V amalgam restorations with three different lining agents and with no lining agent, with and without resin rebonding of the margins. Eight groups of ten molars were divided into four pairs of groups. Class V preparations were cut in the facial surfaces of each molar so that the occlusal margin was in enamel and the gingival margin in dentine. The preparations in one pair of groups received no lining agent; the preparations in the remaining three pairs of groups were lined with one of the following: Copalite, Universal Bond 3 (UB3) Primer and Adhesive, or UB3 Primer only. The enamel walls of the preparations receiving the UB3 Primer and Adhesive were etched prior to applying the lining material. Amalgam was hand condensed into each preparation. In one of each pair of groups, the margins of restorations were treated with 37% phosphoric acid gel, rinsed and dried, and UB3 Adhesive was applied over amalgam and tooth margins and polymerized (rebonded). Specimens were thermocycled, stained and sectioned. Microleakage was graded using a stereomicroscope. Mean microleakage scores for occlusal and gingival margins were calculated and analysed. At enamel margins, non-rebonded Copalite and all rebonded specimens showed less microleakage than the other non-rebonded groups. The group lined with UB3 Primer only and rebonded showed significantly less (P < 0.01) microleakage at enamel margins than all the other groups except the group lined with Copalite and rebonded. At cementum/dentine margins, restorations lined with UB3 Primer and rebonded showed significantly less microleakage than the other groups.
这项体外研究比较了V类汞合金修复体中使用三种不同衬层材料以及不使用衬层材料、边缘有或没有树脂再粘结情况下的微渗漏情况。将八组每组十颗磨牙分为四对组。在每颗磨牙的颊面制备V类洞，使咬合边缘位于釉质内，牙龈边缘位于牙本质内。其中一对组的制备体不使用衬层材料；其余三对组的制备体分别用以下材料之一衬层：科帕利特（Copalite）、通用粘结剂3（UB3）底漆和粘结剂，或仅用UB3底漆。接受UB3底漆和粘结剂的制备体的釉质壁在应用衬层材料之前进行酸蚀。将汞合金手工压实到每个制备体中。在每组中的一对组中，修复体的边缘用37%磷酸凝胶处理，冲洗并干燥，然后在汞合金和牙齿边缘上涂抹UB3粘结剂并聚合（再粘结）。对标本进行热循环、染色和切片。使用体视显微镜对微渗漏进行分级。计算并分析咬合边缘和牙龈边缘的平均微渗漏评分。在釉质边缘，未再粘结的科帕利特和所有再粘结的标本显示出比其他未再粘结的组更少的微渗漏。仅用UB3底漆衬层并再粘结的组在釉质边缘的微渗漏明显少于（P < 0.01）除用科帕利特衬层并再粘结的组之外的所有其他组。在牙骨质/牙本质边缘，用UB3底漆衬层并再粘结的修复体显示出比其他组明显更少的微渗漏。
