Er:YAG激光备洞与树脂充填微渗漏的实验研究

Study of Er: YAG Laser Prepared Cavities and the Resin Filling Microleakage

目的:评价Er:YAG激光备洞对树脂充填材料边缘微渗漏的影响。方法:选择48颗年轻前磨牙随机分成4组,每组12颗牙,用Er:YAG激光或高速牙钻制备ⅴ类洞。对照组:牙钻备洞+35%磷酸酸蚀;实验1组:激光备洞+35%磷酸酸蚀;实验2组:激光备洞+自酸蚀粘接;实验3组:单纯激光备洞。树脂充填,经冷热循环试验后染色24h,体视显微镜下观察微渗漏,统计学处理数据。结果:龈壁的染料渗透,4组间无统计学差异;壁的染料渗透,以实验3组较明显,与对照组、实验1、2组有统计学差异(P<0.05);各组内壁的染料渗透均比龈壁轻,但没有统计学差异。结论:Er:YAG激光备洞,35%磷酸酸蚀或自酸蚀粘接处理可减少洞壁与树脂充填边缘的微渗漏。

Objective： To observe the edge of microleakage of Er： YAG laser prepared cavities filling resin materials.Methods： 48 young and premolars were randomly divided into 4 groups.Er： YAG laser or high-speed dental drill were used to prepare ⅴ class cavities.Control group： Preparation of cavities ＋ acid by 35% phosphoric acid.Experimental group 1： laser preparation ＋ acid by 35% phosphoric acid.Experimental group 2： laser preparation ＋ acid by self-etching adhesive.Experimental group 3： simple laser preparation.We then filled resin thermal cycling,test after staining 24h,observed under a stereomicroscope microleakage and gave statistical analysis.Results： In each group,gingival wall of the hole had no significant difference in dye penetration.Dye penetration of occlusal surface of the experimental group 3 was significantly higher than the control group,experimental group 1,2（P0.05）.In each group,dye penetration of the occlusal wall of hole was lighter than the gingival wall（P0.05）.Conclusion： Er： YAG laser prepared hole,followed by 35% phosphoric acid or self-etching bonding treatment can reduce the edge microleakage of the wall by resin restorations.