Impact of Tooth Brushing on Surface Roughness and Micro-hardness of Different Nano-resin Composites

Aim: To evaluate the effect of simulated tooth brushing on surface roughness and micro-hardness of two nano-fill and two nano-hybrid resin composites and evaluation of 2-year clinical performance. Materials and Methods: For laboratory investigations, two nano-fill and two nano-hybrid commercially available resin composites were used. Baseline data for surface roughness and micro-hardness were gathered. The discs were then undergone tooth brushing simulation through custom-made motor-assisted tooth brush with a toothpaste slurry and under a constant load of 2N. Surface roughness and micro-hardness were again measured after 60 minutes of tooth brushing. Conclusion: Simulated tooth brushing had a negative effect on both surface roughness and micro-hardness of both nano-fill and nano-hybrid resin composites. After 2 years, nano-fill and nano-hybrid resin composites showed acceptable clinical performance in Class V anterior restorations.