Farina Ana P, de Oliveira Emanuele, Disarz Alana, de Moura Ana Lc, Durigon Migueli, Souza Matheus A, Cecchin Doglas
Department of Restorative Dentistry, Faculty of Dentistry, University of Passo Fundo, UPF, Passo Fundo, Rio Grande do Sul, Brazil.
Faculty of Dentistry, University of Passo Fundo, UPF, Passo Fundo, Rio Grande do Sul, Brazil.
J Contemp Dent Pract. 2019 Jun 1;20(6):657-663.
The aim of this study is to assess three protocols for removing a eugenol-based filling endodontic sealer from root dentin and the bond strength of fiberglass posts luted with resin cement.
Sixty single-rooted bovine teeth were prepared and filled with the Endofill endodontic sealer and gutta-percha cones. After 7 days, 9 mm of the filling was removed and divided into five groups ( = 12) according to the cleaning protocol: G1 (negative control), unfilled; G2 (positive control), saline solution; G3, 95% alcohol; G4, amyl acetate; and G5, Largo bur. The canals were hybridized and fiberglass posts were luted with resin cement. They were cross-sectioned in slices of 1 mm and subjected to the push-out test. The other samples were sectioned longitudinally and visualized in a scanning electron microscope (SEM), and the existing chemical elements were quantified by energy dispersive spectroscopy (EDS). The statistical analysis used variance analysis (ANOVA)-one way and Fisher's test, at a 5% significance level.
The 95% alcohol was more effective for cleaning the canal, resulting in a clean dentinal surface and bond strength statistically similar to the negative control. The Largo bur was also statistically similar to the negative control, with only a few debris impregnated on the wall. Amyl acetate showed more sealer residues on the canal walls, with a consequent lower bond strength value than the other groups, only higher than the positive control.
The 95% alcohol and Largo burs may be used after removing the canal filling, so that the bond strength is improved when using the eugenol-based sealer.
本研究旨在评估三种从牙根牙本质上去除丁香酚类根管充填封闭剂的方案以及用树脂水门汀粘结的玻璃纤维桩的粘结强度。
制备60颗单根牛牙，用Endofill根管封闭剂和牙胶尖充填。7天后，去除9mm的充填物，并根据清洁方案分为五组（每组n = 12）：G1（阴性对照），未充填；G2（阳性对照），生理盐水；G3，95%乙醇；G4，乙酸戊酯；G5，Largo钻针。根管进行酸蚀处理，并用树脂水门汀粘结玻璃纤维桩。将其切成1mm厚的薄片并进行推出试验。其他样本纵向切片，在扫描电子显微镜（SEM）下观察，并通过能谱仪（EDS）对存在的化学元素进行定量分析。统计分析采用单因素方差分析（ANOVA）和Fisher检验，显著性水平为5%。
95%乙醇在清洁根管方面更有效，能使牙本质表面清洁，粘结强度在统计学上与阴性对照相似。Largo钻针在统计学上也与阴性对照相似，根管壁上只有少量碎屑附着。乙酸戊酯在根管壁上显示出更多的封闭剂残留，因此粘结强度值低于其他组，仅高于阳性对照。
去除根管充填物后可使用95%乙醇和Largo钻针，以便在使用丁香酚类封闭剂时提高粘结强度。
