3种粘结剂与银汞合金粘结界面的微渗漏研究

目的:比较3种自酸蚀粘结剂与银汞合金粘结后界面的微渗漏情况?方法:收集40颗离体前磨牙,随机分成3个实验组及1个空白对照组,在牙体的唇颊面颈部制备箱状洞型,实验组分别用3种自酸蚀粘结剂(Clearfil SA Luting,Panavia F,Rely X Unicem)处理后充填银汞合金,空白对照组直接充填银汞合金,离体牙在2%亚甲蓝溶液中浸泡4 h后取出并垂直于粘结面切开,在体视显微镜下观察亚甲蓝沿粘结界面渗入的深度,并在扫描电镜下观察粘结界面形态?结果:实验组的界面微渗漏值均小于空白对照组,差异具有显著性(P < 0.05);3个实验组之间的微渗漏值差异无显著性(P > 0.05);实验组■壁的微渗漏值小于龈壁,差异具有显著性(P < 0.05)?结论:自酸蚀粘结剂可以提高银汞合金充填体边缘封闭性?

A study of 3 adhesive resin cements on microleakage of amalgam restoration

Objective:To compare the effect of three adhesive resin cements on microleakage of amalgam restoration. Methods:Forty premolars were randomly divided into four groups. The three experimental groups were restored with bonded amalgam restoration using three adhesive resin cements, respectively(Clearfil SA Luting,Panavia F,Rely X Unicem). The controls was restored with amalgam only. The teeth were immersed in 2% methylene blue solution for 4 hours and then cutted perpendicularly to the bonding surface. The interfaces were then observed under the stereomicroscope,and the depth of immertion of the methylene blue into the interface was recorded and analyzed,and finally investigate the micromorphology of the interface using the scanning electron microscopy. Results:The microleakage of the three experimental groups is less than that of the control group. And there is no differences among the three experimental groups. The microleakage at gingival margin is significantly greater than that of the occlusal margin. Conclusion:The adhesive resin cement can significantly improve the marginal seal of amalgam restorations.