Imperatriz School of Dentistry, Imperatriz, MA, Brazil.
School of Dentistry, Sao Leopoldo Mandic Dental Research Institute, Campinas, SP, Brazil.
J Appl Oral Sci. 2014 Apr;22(2):85-90. doi: 10.1590/1678-775720130339.
The aim of this study was to evaluate the effect of feldspathic ceramic surface cleaning on micro-shear bond strength and ceramic surface morphology.
Forty discs of feldspathic ceramic were prepared and etched with 10% hydrofluoric acid for 2 minutes. The discs were randomly distributed into five groups (n=8): C: no treatment, S: water spray + air drying for 1 minute, US: immersion in ultrasonic bath for 5 minutes, F: etching with 37% phosphoric acid for 1 minute, followed by 1-minute rinse, F+US: etching with 37% phosphoric acid for 1 minute, 1-minute rinse and ultrasonic bath for 5 minutes. Composite cylinders were bonded to the discs following application of silane and hydrophobic adhesive for micro-shear bond strength testing in a universal testing machine at 0.5 mm/min crosshead speed until failure. Stereomicroscopy was used to classify failure type. Surface micromorphology of each treatment type was evaluated by scanning electron microscopy at 500 and 2,500 times magnification.
One-way ANOVA test showed no significant difference between treatments (p=0.3197) and the most common failure types were cohesive resin cohesion followed by adhesive failure. Micro-shear bond strength of the feldspathic ceramic substrate to the adhesive system was not influenced by the different surface cleaning techniques. Absence of or less residue was observed after etching with hydrofluoric acid for the groups US and F+US.
Combining ceramic cleaning techniques with hydrofluoric acid etching did not affect ceramic bond strength, whereas, when cleaning was associated with ultrasound, less residue was observed.
本研究旨在评估长石质陶瓷表面清洁对微剪切结合强度和陶瓷表面形态的影响。
制备 40 个长石质陶瓷圆盘，并使用 10%氢氟酸蚀刻 2 分钟。将圆盘随机分为五组（n=8）：C：无处理，S：水喷雾+空气干燥 1 分钟，US：浸入超声浴 5 分钟，F：用 37%磷酸酸蚀 1 分钟，然后冲洗 1 分钟，F+US：用 37%磷酸酸蚀 1 分钟，冲洗 1 分钟，然后在超声浴中 5 分钟。在应用硅烷和疏水性粘合剂后，将复合圆柱体粘合到圆盘上，以 0.5mm/min 的十字头速度在万能试验机中进行微剪切结合强度测试，直至失效。立体显微镜用于分类失效类型。使用扫描电子显微镜在 500 倍和 2500 倍放大倍数下评估每种处理类型的表面微观形态。
单因素方差分析显示处理之间无显著差异（p=0.3197），最常见的失效类型是复合树脂内聚性失效，其次是黏附性失效。不同表面清洁技术对长石质陶瓷基底与黏附系统的微剪切结合强度没有影响。在用氢氟酸蚀刻的 US 和 F+US 组中，观察到几乎没有残留物或残留物较少。
将陶瓷清洁技术与氢氟酸蚀刻结合使用不会影响陶瓷结合强度，而在清洁时与超声联合使用时，观察到残留物较少。
