摘要
目的:比较金刚砂车针和600目砂纸产生的牙本质玷污层对两步法自酸蚀牙本质粘接系统微拉伸粘接强度的影响。方法:暴露28颗前磨牙的咬合面的牙本质,随机分为2组,分别用高速金刚砂车针(车针组)和600目砂纸(砂纸组)打磨牙本质表面。每组选择2颗牙齿直接用扫描电镜观察牙本质玷污层,剩余的12颗牙齿的打磨面用两步法自酸蚀牙本质粘接系统Opti Bond XTR粘接复合树脂。垂直于粘接面将粘接好的样本切成1 mm厚的薄片,每组随机选取6片在扫描电镜下观察粘接界面的形态;剩余薄片被切割成横截面积为1.0 mm^2的样本,每组随机选择15个样本进行微拉伸力的检测。结果:砂纸组的玷污层薄而均匀;车针组的玷污层较厚,且在牙本质小管内形成管塞。砂纸组和车针组的微拉伸粘接强度分别为(38.77±4.54)MPa 和(38.30±5.11)MPa,2组间差异无统计学意义(P>0.05)。两步法自酸蚀牙本质粘接系统Opti Bond XTR对2种打磨方法产生的粘接面均有良好的渗透,产生的树脂突与底部连接紧密,根部有明显楔状袖口样(funnel-shapped)结构。结论:车针和砂纸打磨形成不同的玷污层,但对两步法自酸蚀牙本质粘接系统Opti Bond XTR的微拉伸粘接强度无明显影响。
Objective： To compare the influence of the smear layer generated by the high-speed diamond bur or 600 grit silicon carbide paper on the microtensile bond strength（u TBS） of a two-step self-etching adhesive to human dentin. Methods： Flat medium occlusal dentin surfaces of 28 premolars were exposed and divided into 2 groups for further grinding with either a high-speed diamond or 600 grit silicon carbide paper. Two prepared dentin surfaces treated by each method were evaluated for the characteristics of smear layer using a scanning electron microscope（SEM）. Twelve specimens from each grinded group were applied with a 2-step self-etching adhesive（Opti Bond XTR）, then built up with a resin composite. Each bonded specimen was sectioned into 1 mm-thick slab perpendicular to bonded interface.Six slabs from each group were randomly selected for observation of the bonded interface using SEM. Other slabs were cut into 1 mm×1 mm specimens. Fifteen specimens were randomly selected to be tested for microtensile bond strength. Results： The high-speed diamond bur created a significantly thicker and more rough smear layer than the silican carbide paper. There was no statistically significant difference（P〉0.05） in microtensile bond strength between the groups. The 2-step self-etching adhesive（Opti Bond XTR） could infiltrate well into the peritubular and intratubular dentin, then hybrid layer and resin tags were formed. Conclusion： Different smear layers had no significant influence on the u TBS of Optibond XTR bond to dentin.
作者
郑铁丽
张佳慧
毛佳杰
顾秦
ZHENG Tieli;ZHANG Jiahui;MAO Jiajie;GU qin(Department of Prothodontics,Hospital of Stomatology,Wenzhou Medical University,Wenzhou,325027;College of Stomatology,Wenzhou Medical University,Wenzhou,325035)
出处
《温州医科大学学报》
CAS
2018年第6期433-436,共4页
Journal of Wenzhou Medical University
基金
温州市科技局科研基金资助项目(Y20160415)
