复合树脂不同修复方法微渗漏的比较

Comparison of Marginal Leakage in Class Ⅱ-restorations after Use of Composite with Different Methods

目的 比较复合树脂 3种不同修复方法的微渗漏情况。 方法 分别将 30颗离体牙制备成两个邻面的 类洞 (MO、DO) ,一侧颈壁位于釉牙骨质界上方 1m m(即颈壁位于牙釉质上 ) ,另一侧位于釉牙骨质界下方 1mm(即颈壁位于牙骨质上 ) ,分别采用直接充填、直接法嵌体、间接法嵌体完成 Brilliant复合树脂修复体 ,经冷热循环品红染色后 ,用金刚砂片将实验牙切成两半 ,在体视镜下测量微渗漏。 结果 直接法和间接法完成的复合树脂嵌体微渗漏无区别 ,均少于直接充填法完成的复合树脂修复体 ;颈壁位于牙釉质上的复合树脂嵌体微渗漏少于颈壁位于牙骨质上的复合树脂嵌体 ;直接充填法完成的复合树脂修复体微渗漏与颈壁位置无关。 结论 树脂嵌体在临床上具有确实可行的应用价值。

Objective\ To evaluate the marginal microleakage in class Ⅱ\|restorations after use of composite with three different methods.\ Methods\ Thirty extracted human molar teeth were prepared MO cavities and DO cavities.\ In one type of cavity gingival margin was placed above the cemento-enamel junction(CEJ).\ In another type gingival margin was placed below the CEJ.\ Cavities were randomly filled with direct filling,direct composite inlays and indirect composite inlays.\ All teeth were thermocycled 200 times between 0℃ and 56℃ and thereafter placed in a basic fuchsin dye solution for 24h at 37℃.\ Finally,all teeth were cut in mesial-distal direction with a band saw and the number of walls of cavities which were dyed were determined under a stereoscopic microscope.\ Results\ There was no difference in microleakage between the direct composite inlay group and indirect composite inlay group.\ But direct filling group showed more microleakage(P<0 05).\ The number of inlay microleakage of gingival margin placed below CEJ was more than that of gingival margin placed above CEJ.\ Conclusion\ Composite inlays has a practical value on class Ⅱ-restorations.