Resistência adesiva de restauração em resina composta convencional baseada em princípios biomiméticos

Abstract

Introduction: The search for restorative techniques that mimic the biomechanical properties of natural teeth has driven the development of biomimetic approaches. Objective: To evaluate the bond strength of conventional composite resin restorations associated with different adhesive techniques, as well as to analyze the failure patterns. Methodology: Thirty-two human molars were divided into four groups: G1 (conventional adhesive system - AS), G2 (AS + flowable resin), G3 (AS + flowable resin after 5 minutes), and G4 (AS + flowable resin after 5 minutes + Ribbond). The restorations were subjected to microtensile bond strength testing, and failure patterns were assessed under a magnifying loupe. Data were statistically analyzed using one-way ANOVA and LSD post-hoc test, and failure patterns were evaluated descriptively. Results: G1 and G3 did not differ significantly from the other groups. G2 showed a predominance of cohesive failures in dentin and presented the highest mean bond strength, differing statistically from G4. Conclusion: The immediate application of flowable resin may favor adhesion in Class I cavities restored with conventional composite resin, while the use of reinforcing fibers did not positively contribute to bond strength.