Nd:YAG激光对自黏结树脂水门汀与牙本质黏结强度的影响  

Effect of pulse Nd:YAG laser on the bond strength of self-adhesive resin cement to dentin

作　　者：刘琨[1] 邓婧[1] 张惠民[2] 姚丽霞[2] 

机构地区：[1]青岛大学医学院附属医院口腔内科,山东青岛266003 [2]山东省聊城市人民医院口腔科,山东聊城252000

出　　处：《上海口腔医学》2011年第4期381-384,共4页Shanghai Journal of Stomatology

摘　　要：目的:采用剪切强度实验和扫描电镜,评价脉冲Nd:YAG激光对自黏结树脂水门汀与牙本质之间黏结强度的影响。方法:选择新鲜、无龋、无裂纹的人离体前磨牙10颗,分为颊、舌2部分,暴露牙本质黏结面,形成20个测试试件,随机分为激光组和对照组(n=10)。激光组以0.8W、10Hz脉冲Nd:YAG激光作用于涂墨汁的牙本质表面25s,联合自黏结树脂水门汀RelyX Unicem充填;对照组直接使用自黏结树脂水门汀RelyX Unicem充填于牙本质表面,放置在37℃生理盐水中24h后,测试剪切强度,在牙科显微镜下观察断裂模式并分类。采用SPSS 17.0软件包对数据进行统计学处理。最后,扫描电镜下观察试件的树脂水门汀-牙本质的纵剖面。结果:对照组和激光组的剪切强度分别为(9.48±1.80)MPa和(11.15±1.71)MPa,有显著差异(P<0.05)。牙科显微镜下观察,2组试件断裂大部分发生在树脂水门汀-牙本质界面。扫描电镜观察,2组自黏结树脂水门汀RelyX Unicem与牙本质之间结合较紧密,但均未见树脂突。结论:Nd:YAG激光(0.8W、10Hz)处理牙本质,能提高自黏结树脂水门汀RelyX Unicem与牙本质之间的黏结强度。PURPOSE： To evaluate the bond strength of a self-adhesive resin cement to dentin by pulse Nd：YAG laser.METHODS： Ten freshly extracted non-carious human premolars were cut into nearly equal halves and prepared to expose the dentin,randomly divided into two groups with 10 in each group：laser group and control group.All teeth were bonded using a self-adhesive resin cement to dentin after the teeth in the laser group were processed with pulse Nd：YAG laser（0.8W,10Hz） for 25s.After 24 hours under 37℃ water,the shear bond strengths of specimens were measured.Each fractured specimen was examined under dental microscope.All statistical analysis was performed using SPSS 17.0 software package.Two new specimens were cut and the cement-dentin interfaces were observed under SEM.RESULTS： The shear bond strength in the control group and laser group was（9.48±1.80）MPa and（11.15±1.71）MPa,respectively,the difference was statistically significant（P〈0.05）.Most of the fractured adhesive dentin surfaces were adhesive failure modes in the two groups.SEM observation of the cement-dentin interface in the two groups showed good adaptation,but resin tags were not observed.CONCLUSION： Pulse Nd：YAG laser（0.8W,10Hz） can increase the bond strength of self-adhesive resin cement to dentin.

关 键 词：ND:YAG激光 自黏结树脂水门汀 剪切强度 扫描电镜 

分 类 号：R783.1[医药卫生—口腔医学]