Evaluation of the Long-Term Stability of Composite Resin Restorations Subjected to Simulated Bruxism Forces

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Elena Kostova

Sofia Medical University, Bulgaria

: Dent Health Curr Res

Abstract

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Composite resin restorations are widely used for aesthetic dental repairs but may be susceptible to mechanical degradation under bruxism-related occlusal forces. This in vitro study evaluated the mechanical properties and surface integrity of different composite resins after cyclic loading simulating 1 million bruxism cycles. Three commercially available composites (microhybrid, nanohybrid, and bulk-fill) were tested for flexural strength, hardness, and surface roughness pre- and post-cyclic loading. Nanohybrid composites demonstrated superior retention of mechanical properties, with flexural strength decreasing by only 8%, compared to 20% in microhybrid resins. Surface roughness increased significantly in all groups, but bulk-fill composites showed the greatest wear. Findings suggest that nanohybrid composites may offer enhanced durability for patients with parafunctional habits. Clinicians should consider material selection carefully to optimize restoration longevity in bruxism cases.

Biography

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Elena Kostovaâ??s expertise lies in dental materials science, focusing on the performance of restorative materials under biomechanical stress. She has authored several studies evaluating resin composites and their clinical implications. Kostova actively collaborates with material manufacturers to develop innovative, wear-resistant dental products.