Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil.
J Dent. 2013 Jul;41(7):653-8. doi: 10.1016/j.jdent.2013.04.009. Epub 2013 Apr 30.
The aim of this study was to assess the microtensile bond strength (μTBS), nanoleakage (NL), nano-hardness (NH) and Young's modulus (YM) of resin-dentine bonding components formed by an experimental adhesive system with or without inclusion of diphenyliodonium salt (DPIH) in the camphorquinone-amine (CQ) system.
On 12 human molars, a flat superficial dentine surface was exposed by wet abrasion. A model simplified adhesive system was formulated (40 wt.% UDMA/MDP, 30 wt.% HEMA and 30 wt.% ethanol). Two initiator systems were investigated: 0.5 mol% CQ+1.0 mol% EDMAB and 0.5 mol% CQ+1.0 mol% EDMAB+0.2 mol% DPIH. Each adhesive was applied and light-cured (10s; 600 mW/cm(2)). Composite build-ups were constructed incrementally and resin-dentine specimens (0.8mm(2)) were prepared. For NL, 3 bonded sticks from each tooth were coated with nail varnish, placed in the silver nitrate, polished down with SiC papers and analysed by EDX-SEM. NH and YM were performed on the hybrid layer in 2 bonded sticks from each teeth. The remaining bonded sticks were tested on μTBS (0.5mm/min). The data from each test were submitted to a Student t-test (α=0.05).
No significant difference was found for μTBS between groups (p>0.05). Significant lower NL and higher NH and YM were found in the hybrid layer and adhesive layer produced with the iodinium salt-containing adhesive (p<0.05).
The inclusion of the DPIH to the traditional CQ is a good strategy to improve the adhesive and mechanical properties of a simplified etch-and-rinse adhesive system.
本研究旨在评估含有或不含有二苯基碘𬭩盐（DPIH）的樟脑醌-胺（CQ）体系的实验性黏结系统形成的树脂-牙本质黏结组分的微拉伸黏结强度（μTBS）、纳米渗漏（NL）、纳米硬度（NH）和杨氏模量（YM）。
在 12 个人类磨牙上，通过湿磨蚀暴露一个平坦的浅表层牙本质表面。制定了一种简化的模型黏结系统（40wt.% UDMA/MDP、30wt.% HEMA 和 30wt.% 乙醇）。研究了两种引发剂体系：0.5mol% CQ+1.0mol% EDMAB 和 0.5mol% CQ+1.0mol% EDMAB+0.2mol% DPIH。每个黏结剂均应用并光固化（10s；600mW/cm(2)）。增量构建复合结构，并制备树脂-牙本质试件（0.8mm(2)）。对于 NL，从每个牙齿的 3 个黏结棒上涂指甲油，放入硝酸银中，用 SiC 纸抛光，并用 EDX-SEM 分析。在每个牙齿的 2 个黏结棒中的混合层上进行 NH 和 YM。其余的黏结棒在 μTBS 上进行测试（0.5mm/min）。每个测试的数据都提交给学生 t 检验（α=0.05）。
各组之间的 μTBS 无显著差异（p>0.05）。在含有碘𬭩盐的黏结剂形成的混合层和黏结层中，NL 显著降低，NH 和 YM 显著升高（p<0.05）。
在传统 CQ 中加入 DPIH 是提高简化酸蚀-冲洗黏结系统黏结和机械性能的一种有效策略。
