Efeito da vibração sônica e ultrassônica em um adesivo autocondicionante e de frasco único na resistência de união em dentina

Abstract

Purpose: Investigate the influence of bonding systems application activated through a sonic and ultrasonic vibration and a sonic prototype on micro-tensile bond strength in dentin. Materials and Methods: Twenty-four extracted caries-free intact human molar teeth were embedded in a self-cured acrylic resin. The enamel was removed, using wet 220-, and 600-grit abrasive papers. Each adhesive system (self-etching primer and a single bottle total etch) was applied according to the manufacturer's instructions. Then, the groups were classified according to the type and method of application of bonding systems. After the adhesive technique, resin composite was condensed and light-cured for 20s. Afterwards, all specimens were completely included in a self-cured acrylic resin to stabilize the restorative material and the adhesive interface for the serial sections in a cutting machine. These cylinders were stored in distilled water at room temperature 37°C for 24h. The specimens were stressed in the interface between the composite and the dental surface until fracture occurred. The values were recorded in MPa, and submitted to statistical analysis. Data were submitted to Kolmogorov-Smirnov normality test. Two-way ANOVA and Tukey s Test for pairwise multiple comparisons were used (p<0.05). The failure modes were recorded in percentages.Results: The micro tensile bond strengths with sonic vibration were higher than the other groups, showing statistically significant differences. The sonic, ultrasonic and prototype group had more cohesive failure in resin compared to the control group, which had more cohesive failures of the hybrid layer. Conclusion: The application with a sonic vibration is an effective method for the optimization of bond strength in dentin