Two-year Clinical Evaluation of Ormocer, Nanohybrid and Nanofill Composite Restorative Systems in Posterior Teeth Mahmoud SH et al. - All materials showed only minor changes, and no differences were detected between their performance at baseline and after 2 years. Only one ormocer and one microhybrid composite restoration had failed after 2 years. No failure was detected in nanohybrid and nanofill composite restorations. Regarding the clinical performance, there were no statistically significant differences among the materials used. [more...]