【摘要】 目的:评价Nd:YAG激光对不同水门汀与牙本质之间边缘微渗漏的影响。方法:选用人离体磨牙48颗,间接法制作树脂嵌体,随机分为激光组和对照组,激光组使用80 mJ、10 Hz脉冲Nd:YAG激光照射后,分别用6种水门汀粘结树脂嵌体。全部试件放在37℃生理盐水中7 d,并冷热循环300次后,放置于0.5%的品红溶液中染色24 h,沿嵌体长轴纵剖后在根管显微镜下观察微渗漏情况,采用SPSS 17.0软件包对数据进行统计学处理。结果:6组牙本质经Nd:YAG激光照射后微渗漏程度均有降低趋势,且前2种水门汀有统计学差异(P<0.05)。另外,树脂水门汀与牙本质之间的微渗漏程度比水基水门汀低。结论:80 mJ、10 Hz脉冲Nd:YAG激光照射牙本质壁,可提高洞壁的密合度,减少微渗漏。更多还原

【Abstract】 Objective:To evaluate the microleakage of the different cements and dentin before and after using Nd:YAG laser.Method:Forty-eight human molars were randomly divided into two groups:laser group and control group,and composite resin inlays were fabricated indirectly.Teeth in the laser group were processed with pulse Nd:YAG laser(0.8 W,10 Hz).Then,composite resin inlays were luted with 6 cements.After 7 days of storage in water at 37 ℃,specimens were subjected to 300 thermocycles ranging from 4 ℃ to 55 ℃.Then,they were placed into a 0.5 % basic fuchsin dye for 24 h.After soaking,specimens were longitudinally sectioned into four sections.Subsequently,the specimens were observed for microleakage using dental microscope.All statistical analysis was performed using SPSS 17.0 software package.Result:The microleakage between 6 cements and dentin.was all decreased after using Nd:YAG laser,and there was significant difference among former 2 cements on marginal adaptation(P <0.05).Resin cements showed lower microleakage than other cements.Conclusion:Nd:YAG laser(0.8 W,10 Hz) can increase the marginal adaptation and decrease the microleakage between cements and dentin.更多还原