Arcoria C J, Vitasek B A, DeWald J P, Wagner M J
Department of Operative Dentistry, Caruth School of Dental Hygiene, Dallas, Texas.
J Dent. 1990 Apr;18(2):107-12. doi: 10.1016/0300-5712(90)90095-v.
The purpose of this study was to compare microleakage around two types of restorations lined with polyalkenoate (glass ionomer) cements after thermocycling. Preparations were made in 48 molars to a diameter and depth of 2.0 mm. Half of the preparations were lined with glass ionomer, and the remainder were not lined. Dental amalgam or glass ionomer restorative material was placed and the amalgams were left unburnished and unpolished. Selected restorations were thermocycled 625 times between 4 degrees C and 50 degrees C. Teeth were immersed in 0.5 per cent methylene blue solution, sectioned and visually scored for microleakage at X 100 magnification. Data analysis indicated significant differences in microleakage because of: thermocycling (chi 2 = 103.38, d.f. = 19,2P less than 0.0004); presence of glass ionomer liners (chi 2 = 53.28, d.f. = 19,2P less than 0.0001); and type of restorative material (chi 2 = 103.44,d.f. = 19,2P less than 0.0004). The use of a glass ionomer liner significantly reduced microleakage in both amalgam and glass ionomer restorations when subjected to thermocycling.
本研究的目的是比较热循环后两种用聚烯烃酸（玻璃离子）粘固剂垫底的修复体周围的微渗漏情况。在48颗磨牙上制备直径和深度均为2.0mm的洞型。其中一半洞型用玻璃离子垫底，其余则不垫底。放置牙科汞合金或玻璃离子修复材料，汞合金修复体不进行打磨和抛光。对选定的修复体在4℃至50℃之间进行625次热循环。将牙齿浸入0.5%的亚甲蓝溶液中，切片并在100倍放大倍数下对微渗漏进行视觉评分。数据分析表明，由于以下因素，微渗漏存在显著差异：热循环（χ2 = 103.38，自由度 = 19，P<0.0004）；玻璃离子衬层的存在（χ2 = 53.28，自由度 = 19，P<0.0001）；以及修复材料的类型（χ2 = 103.44，自由度 = 19，P<0.0004）。在热循环条件下，使用玻璃离子衬层可显著降低汞合金和玻璃离子修复体中的微渗漏。
