Borsatto Maria Cristina, Catirse Alma Blásida Elisaur Benitez, Palma Dibb Regina Guenka, Nascimento Telma Nunes do, Rocha Renata Andréa Salvitti de Sá, Corona Silmara Aparecida Milori
Department of Clinical Pediatrics, Faculty of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Braz Dent J. 2002;13(3):175-8. doi: 10.1590/s0103-64402002000300006.
The aim of this study was to evaluate the shear bond strength of a composite resin to dental enamel, using three different surface treatments. Fifteen sound third molars were randomly assigned to three groups. The mesial and distal surfaces were flattened and covered using adhesive tape with a central orifice delimiting the adhesion area (7.07 mm2). Group I, the enamel surface was conditioned with 37% phosphoric acid for 15 s; group II, the surface was treated using air abrasion with aluminum oxide; group III, the enamel surface was treated using an association of air abrasion with aluminum oxide and 37% phosphoric acid. The Single Bond (3M) adhesive system was applied and a Teflon matrix was placed and filled with composite resin Z-100 (3M) and light-cured. The shear bond strength test was performed with a universal testing machine. The acid etching technique and air abrasion with aluminum oxide associated with acid etching had the highest shear bond strength values. Data were subjected to statistical analysis using ANOVA and the Turkey test, and no statistically significant difference in shear bond strength was observed between group I (12.49 +/- 2.85 MPa) and group III (12.59 +/- 2.68 MPa). In contrast, both groups had statistically better shear bond strengths compared to group II (0.29 +/- 0.56 MPa; p < 0.05). Air abrasion with aluminum oxide does not substitute acid etching. The association of these methods to obtain adequate adhesion to the substrate is necessary.
本研究的目的是使用三种不同的表面处理方法，评估复合树脂与牙釉质之间的剪切粘结强度。将15颗完好的第三磨牙随机分为三组。将近中面和远中面磨平，并用带有界定粘结区域的中心孔的胶带覆盖（7.07平方毫米）。第一组，牙釉质表面用37%的磷酸处理15秒；第二组，表面采用氧化铝空气磨蚀处理；第三组，牙釉质表面采用氧化铝空气磨蚀与37%磷酸联合处理。应用Single Bond（3M）粘结系统，放置聚四氟乙烯基质，并用复合树脂Z-100（3M）填充并光固化。使用万能试验机进行剪切粘结强度测试。酸蚀技术以及氧化铝空气磨蚀与酸蚀联合处理具有最高的剪切粘结强度值。数据采用方差分析和Turkey检验进行统计分析，在第一组（12.49±2.85兆帕）和第三组（12.59±2.68兆帕）之间未观察到剪切粘结强度的统计学显著差异。相比之下，与第二组（0.29±0.56兆帕；p<0.05）相比，这两组的剪切粘结强度在统计学上均更好。氧化铝空气磨蚀不能替代酸蚀。必须将这些方法联合使用以获得对基底的足够粘结力。
