壁处与龈壁处的微渗漏的比较——湿润粘接技术修复V类洞洞型

Comparison of Microleakage Between the Dentinal and the Enamel Margins in Class V RestorationsUsing wet-Bonding Technique

目的：实验研究湿润粘接技术修复Ｖ类洞洞型时，壁处与龈壁处的微渗漏的比较．方法：４８颗人离体磨牙根据颊、近中和远中面分别分成Ａ、Ｂ、Ｃ三组，每组又随机分成４小组（ｎ＝１２），洞型位于釉牙本质交界处．Ａ１和Ａ２组常规制备Ｖ类洞洞型；但Ａ２制备洞缘斜面；Ａ３、Ａ４用空气喷磨技术制备Ｖ类洞洞型，但分别使用方法５０μｍ和２７μｍ氧化铝微粒．Ｂ、Ｃ各小组处理与相应Ａ组相同．所有牙齿用０．５％亚甲基蓝着色．结果：所有标本在龈壁处存在严重的微渗漏（ｐ＜０．００１）．

The aim of this in vitro study was to compare the microleakage of resin composite between the dentinal and the enamel margins in Class V restorations when the wet-bonding technique was applied.Methods:Forty-eight human molar teeth were assigned into three groups(A,B,C)according to the buccal,mesial and distal surfaces.Then,the teeth were randomly divided into four subgroups(n=12).Al and A2 were prepared with the high-speed diamond bur,but only A2 was with bevel.A3 and A4 were air-abraded with KCP-1000,using 50 and 27 um aluminum oxide particles respectively.All specimens were stained with 0.5% methylene blue solution after restorations.All specimens were evaluated and recorded with stereomicroscope at 25Xmagnifications after they were longitudinally sectioned through the center of the restorations.Results:All specimens leaked severely in dentinal margins( p<0.001 ).Conclusions:The wet-bonding technique did not reduce the microleakage of resin composites in dentinal margins in Class V restorations.