Gupta Swati, Vellanki Vinay Kumar, Shetty Vikram K, Kushwah Sudhanshu, Goyal Geeta, Chandra S M Sharath
Senior Lecturer, Department of Conservative Dentistry and Endodontics, Ideas Dental College , Gwalior, Madhya Pradesh, India .
Senior Lecturer, Department of Conservative Dentistry Dentistry and Endodontics, Malla Reddy Institute of Dental Sciences , Hyderabad, Telangana, India .
J Clin Diagn Res. 2015 Jan;9(1):ZC09-11. doi: 10.7860/JCDR/2015/11463.5386. Epub 2015 Jan 1.
To compare the shear bond strength of nanocomposites to dentin using three different types of adhesive systems; and to test few specimens under Scanning Electron Microscope (SEM) for analysing whether the bond failure is adhesive or cohesive.
Sixty human premolar teeth were selected and were randomly grouped, with 20 specimens in each group: group 1 - fluoride releasing dentin bonding agent; group 2 - antibacterial containing dentin bonding agent; and group 3 - one step conventional self etch adhesive. Each group was treated with its respective bonding agents, composite resin build up was done, and shear bond strengths were tested using Instron Universal testing machine. Few of the specimens were tested under SEM.
The results were statistically analysed using One-way ANOVA and paired t-test. It was observed that group 3 has the highest shear bond strength followed by group 2, and then group 1. Adhesive failures and mixed failures were most frequent types of failures as seen under SEM.
Addition of antimicrobial agent decreases the bond strength of dentin bonding agent and addition of fluoride further decreases the bond strength. From SEM results it can be concluded that the zone of failure could not be defined and also that the failure mode was independent of the dentin bonding agent used.
使用三种不同类型的粘结系统比较纳米复合材料与牙本质的剪切粘结强度；并在扫描电子显微镜（SEM）下测试少量样本，以分析粘结失败是粘结性的还是内聚性的。
选取60颗人类前磨牙，随机分组，每组20个样本：第1组 - 含氟牙本质粘结剂；第2组 - 含抗菌剂的牙本质粘结剂；第3组 - 一步法传统自酸蚀粘结剂。每组用各自的粘结剂进行处理，进行复合树脂堆积，并用英斯特朗万能试验机测试剪切粘结强度。对少量样本进行SEM测试。
使用单向方差分析和配对t检验对结果进行统计学分析。观察到第3组的剪切粘结强度最高，其次是第2组，然后是第1组。如在SEM下所见，粘结失败和混合失败是最常见的失败类型。
添加抗菌剂会降低牙本质粘结剂的粘结强度，添加氟化物会进一步降低粘结强度。从SEM结果可以得出结论，无法确定失败区域，并且失败模式与所使用的牙本质粘结剂无关。
