Mustafa Ammar A, Matinlinna Jukka P, Saidin Syafiqah, Kadir M R Abdul
Assistant Professor, Dental Materials Science Department, Faculty of Dentistry, International Islamic University Malaysia, Kuantan Campus, Pahang, Malaysia.
Associate Professor, Dental Materials Science Department, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China.
J Prosthet Dent. 2014 Dec;112(6):1498-506. doi: 10.1016/j.prosdent.2014.05.011. Epub 2014 Jun 30.
The inconsistency of dentin bonding affects retention and microleakage.
The purpose of this laboratory and finite element analysis study was to investigate the effects on the formation of a hybrid layer of an experimental silane coupling agent containing primer solutions composed of different percentages of hydroxyethyl methacrylate.
A total of 125 sound human premolars were restored in vitro. Simple class I cavities were formed on each tooth, followed by the application of different compositions of experimental silane primers (0%, 5%, 25%, and 50% of hydroxyethyl methacrylate), bonding agents, and dental composite resins. Bond strength tests and scanning electron microscopy analyses were performed. The laboratory experimental results were validated with finite element analysis to determine the pattern of stress distribution. Simulations were conducted by placing the restorative composite resin in a premolar tooth by imitating simple class I cavities. The laboratory and finite element analysis data were significantly different from each other, as determined by 1-way ANOVA. A post hoc analysis was conducted on the bond strength data to further clarify the effects of silane primers.
The strongest bond of hybrid layer (16.96 MPa) was found in the primer with 25% hydroxyethyl methacrylate, suggesting a barely visible hybrid layer barrier. The control specimens without the application of the primer and the primer specimens with no hydroxyethyl methacrylate exhibited the lowest strength values (8.30 MPa and 11.78 MPa) with intermittent and low visibility of the hybrid layer. These results were supported by finite element analysis that suggested an evenly distributed stress on the model with 25% hydroxyethyl methacrylate.
Different compositions of experimental silane primers affected the formation of the hybrid layer and its resulting bond strength.
牙本质粘结的不一致性会影响固位力和微渗漏。
本实验室研究和有限元分析的目的是探讨含不同百分比甲基丙烯酸羟乙酯的底漆溶液的实验性硅烷偶联剂对杂化层形成的影响。
共125颗健康人前磨牙在体外进行修复。在每颗牙齿上制备简单的I类洞，然后应用不同成分的实验性硅烷底漆（0%、5%、25%和50%甲基丙烯酸羟乙酯）、粘结剂和牙科复合树脂。进行粘结强度测试和扫描电子显微镜分析。通过有限元分析验证实验室实验结果，以确定应力分布模式。通过模仿简单I类洞将修复性复合树脂置于前磨牙中来进行模拟。经单向方差分析确定，实验室数据和有限元分析数据存在显著差异。对粘结强度数据进行事后分析，以进一步阐明硅烷底漆的作用。
在含25%甲基丙烯酸羟乙酯的底漆中发现杂化层的粘结力最强（16.96MPa），表明杂化层屏障几乎不可见。未应用底漆的对照样本和不含甲基丙烯酸羟乙酯的底漆样本表现出最低的强度值（8.30MPa和11.78MPa），杂化层间歇性出现且可见度低。有限元分析支持了这些结果，该分析表明在含25%甲基丙烯酸羟乙酯的模型上应力分布均匀。
实验性硅烷底漆的不同成分影响杂化层的形成及其粘结强度。
