蔗糖、柠檬酸、碳酸氢钠对3种口腔粘接剂粘接强度的影响

摘要

目的:研究3种粘接剂粘接强度受蔗糖、柠檬酸、碳酸氢钠的影响.方法:将60颗制备后的离体牙与60个氧化锆块(3mmn×3 mm×3 mm)随机分为3组:PULPDENT组、3M ESPE RelyxTM Veneer组和RelyxTM Luting组,每组再分为4小组(n=5):A组:人工唾液组;B组:10％蔗糖组;C组:0.2％柠檬酸组;D组:0.03％碳酸氢钠组.将试件用相应粘接剂粘接完成后,B、C、D组分别浸泡在蔗糖、柠檬酸和碳酸氢钠溶液中,2次/d,5min/次,其余时间同A组一样浸泡在人工唾液中.3个月后,测定剪切粘接强度,20×显微镜观察断裂模式并在扫描电镜下观察断裂面.将数据用SPSS 17.0软件进行统计分析.结果:PULP-DENT组、3M ESPE RelyxTM Veneer组的粘接强度高于RelyxTM Luting组(P＜0.05);B组、C组、D组粘接强度低于A组(P＜0.05);其余各组两两比较差异无统计学意义(P＞0.05);3组粘接剂试件均显示为界面破坏;扫描电镜结果显示,RelyxTM Luting组中,B组、C组、D组与A组相比龟裂纹深度、宽度及长度均增加;其余各组与对照组相比无显著区别.结论:相对于PULP-DENT和3M ESPE RelyxTM Veneer粘接剂,RelyxTM Luting易受蔗糖、柠檬酸和碳酸氢钠的影响,不适用于氧化锆的粘接.%Objective:To study the influences of sucrose,citric acid and sodium bicarbonate on the adhesion of 3 kinds of adhesives.Methods:60 extracted tooth and 60 zirconia blocks (3 mm × 3 mm × 3 mm) were randomly divided into 3 groups (n =20),namely PULPDENT group,3M ESPE RelyxTM Veneer group and RelyxTM Luting group.Then,the samples of each group fell into 4 subgroups(n=5),namely subgroup A for artificial saliva,subgroup B for 10％ sucrose,subgroup C for 0.2％ citric acid,and subgroup D for 0.03 ％ sodium bicarbonate.After completing the adhesion of the specimens with corresponding adhesives,the specimens of subgroups A,B,C and D were submerged into artificial saliva(the control),sucrose,citric acid and sodium bicarbonate solutions for 2 times/day and 5 min/time,respectively.For the rest of time,all the specimens were submerged in artificial saliva.3 months later,shear bond strength of the specimens was tested,the fracture surface was observed under SEM,20 × microscope,and the fracture model was observed by stereoscopic microscope.SPSS 17.0 software was adopted for statistical analysis of the data.Results:The bond strength of PULPDENT,3M ESPE RelyxTM Veneer groups were higher than that of RelyxTM Luting group(P ＜ 0.05);the bond strength of subgroups B,C and D was lower than that of subgroup A(P ＜0.05);and the difference between the remaining groups was not statistically significant(P ＞0.05).SEM observation displayed that in group RelyxTM Luting,subgroups B,C and D showed increased crack depth,width and length when compared with subgroup A;there was no obvious difference between the remaining groups and the control group;in groups PULPENT,3M ESPE RelyxTM Veneer and RelyxTM Luting,all samples in their subgroups showed interface failure.Conclusion:Compared with PULPDENT and 3M ESPE RelyxTM Veneer adhesive,RelyxTM Luting is more susceptible to the influence of sucrose,citric acid and sodium bicarbonate,so it is not suitable for bonding zirconia blocks.