Department of Restorative Dentistry, Federal University of Ceará Dental School, Rua Monsenhor Furtado, S/N, Rodolfo Teófilo, Fortaleza, CE 60438-160, Brazil.
J Dent. 2011 Mar;39(3):255-62. doi: 10.1016/j.jdent.2011.01.004. Epub 2011 Jan 15.
This study tested the hypothesis that bond strength of total- and self-etching adhesive systems to dentine is not affected by the presence of remnants from either eugenol-containing (EC) or eugenol-free (EF) temporary cements after standardized cleaning procedures.
Thirty non-carious human third molars were polished flat to expose dentine surfaces. Provisional acrylic plates were fabricated and cemented either with EC, EF or no temporary cements. All specimens were incubated for 7 days in water at 37°C. The restorations were then taken out and the remnants of temporary cements were mechanically removed with a dental instrument. The dentine surfaces were cleaned with pumice and treated with either total-etching (TE) or self-etching (SE) dental adhesive systems. Atomic force microscopy was used to examine the presence of remnants of temporary cements before and after dentine cleaning procedures. Composite resin build-ups were fabricated and cemented to the bonded dentine surfaces with a resin luting cement. The specimens were then sectioned to obtain 0.9mm(2) beams for microtensile bond strength testing. Fractographic analysis was performed by optical and scanning electron microscopy.
ANOVA showed lower mean microtensile bond strength in groups of specimens treated with EC temporary cement than in groups treated with either no cement or an EF cement (p<0.05). Mean microtensile bond strength was lower in groups employing the SE rather than the TE adhesive system (p<0.001). SE samples were also more likely to fail during initial processing of the samples. There was no evidence of interaction between cement and adhesive system effects on tensile strength. Fractographic analysis indicated different primary failure modes for SE and TE bonding systems, at the dentine-adhesive interface and at the resin cement-resin composite interface, respectively.
The use of eugenol-containing temporary cements prior to indirect bonding restorations reduce, to a statistically similar extent, the bond strength of both total- and self-etching adhesive systems to dentine.
本研究旨在验证以下假设，即使用标准化清洁程序后，牙本质上残留的含丁香酚（EC）或无丁香酚（EF）暂封材料对全酸蚀和自酸蚀黏结系统与牙本质的黏结强度没有影响。
30 颗无龋第三磨牙被打磨平整，以暴露牙本质表面。制作临时丙烯酸树脂夹板并用 EC、EF 或无暂封材料黏结。所有标本均在 37°C 水中孵育 7 天。然后取出修复体，用牙科器械机械去除暂封材料的残余物。用浮石清洁牙本质表面，并用全酸蚀（TE）或自酸蚀（SE）黏结系统处理。原子力显微镜用于在清洁前后检测暂封材料残余物的存在。用树脂黏结剂将复合树脂构建体黏结到黏结的牙本质表面。然后将标本切割成 0.9mm(2)的薄片进行微拉伸黏结强度测试。用光镜和扫描电镜进行断口形貌分析。
方差分析显示，用 EC 暂封材料处理的试件组的平均微拉伸黏结强度低于未用暂封材料或 EF 暂封材料处理的试件组（p<0.05）。采用 SE 而非 TE 黏结系统的试件组的平均微拉伸黏结强度较低（p<0.001）。SE 样品在样品初始处理过程中更容易失效。暂封材料和黏结系统对拉伸强度的影响之间没有相互作用的证据。断口形貌分析表明，SE 和 TE 黏结系统在牙本质-黏结剂界面和树脂黏结剂-树脂复合材料界面分别有不同的主要失效模式。
在间接黏接修复前使用含丁香酚的暂封材料会降低全酸蚀和自酸蚀黏结系统与牙本质的黏结强度，统计学上相似。
