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目的:研究复合树脂与Er,Cr:YSGG(掺铒铬钇钪镓石榴石)激光制备的窝洞壁间微渗漏。方法:将30颗离体前磨牙随机分为3组(n=10),制备V类洞。第1组为激光预备加37%磷酸处理组,第2组为激光预备加FL-BOND处理组,第3组为激光预备加17%EDTA处理组。经冷热循环染色后,采用染料渗入法和扫描电镜方法观察充填体微渗漏情况,采用SPSS11.0软件包对数据进行统计学处理。结果:壁处染料渗入结果显示,第2组的染料渗入评分最小,与其余2组有显著差异(P<0.05),第1组与第3组无显著差异。扫描电镜观察显示,第2组与第3组的边缘微缝隙宽度有显著差异(P<0.05),其余各组间无显著差异,此结果与染料渗入法的结果不完全一致。龈壁处,3组染料渗入评分及充填体边缘微缝隙宽度均无显著差异,仅第2组壁与龈壁的染料渗入评分及边缘微缝隙宽度有显著差异(P<0.05)。结论:自酸蚀黏结剂可有效减少复合树脂与Er,Cr:YSGG激光制备的V类洞壁间微渗漏;在全酸蚀黏结剂及应用EDTA处理剂的条件下,复合树脂与Er,Cr:YSGG激光制备的窝洞壁间微渗漏无差异。
Objective: To study the microleakage between the composite resin and the Er, Cr: YSGG (erbium doped yttrium and scandium gallium garnet) lasers. Methods: 30 ex-molars were randomly divided into three groups (n = 10) to prepare Class V caves. The first group was laser pretreatment plus 37% phosphoric acid treatment group, the second group was laser pretreatment plus FL-BOND treatment group, the third group was laser pretreatment plus 17% EDTA treatment group. After the hot and cold cycle dyeing, using the dye infiltration method and scanning electron microscopy method to observe the microleakage of the filling body, using SPSS11.0 software package for data processing. Results: The results of dye infiltration at the wall showed that the dye infiltration score of group 2 was the smallest, with significant difference from the other two groups (P <0.05), and there was no significant difference between group 1 and group 3. Scanning electron microscopy showed that there was a significant difference (P <0.05) between the marginal micro-slit width of Group 2 and Group 3 and no significant difference between the other groups. The result was not consistent with the results of dye infiltration method. There was no significant difference in gingival wall score, infiltration score of 3 groups and marginal micro-gap width of filling body, but there was significant difference (P <0.05) between the infiltration score and margin width of marginal micro-gap in wall 2 and gingival wall of group 2 only. Conclusion: The self-etching adhesive can effectively reduce the microleakage between the composite resin and Er-Cr: YSGG lamellar V-shaped wall. Under the condition of all acid-etching adhesive and EDTA treatment agent, There was no difference in intracavity microleakage between Cr: YSGG and laser.