Effect of Polymerization Time and Shade on the Depth of Cure of Nano-Hybrid Resin Composites

Abstract Objective The effect of polymerization time and resin shade on the depth cure (DOC) two nano-hybrid composites (Filtek Z250 XT IPS Empress Direct) was evaluated compared. Materials Methods Sixty specimens were prepared from shades (A1 A3) composites. allocated into groups that further divided three subgroups depending (20, 40, 60 sec; n = 5). After that, DOC by calculating polymerized part specimen’s thickness to nearest (0.01 mm) using a high-accuracy micrometer. Each specimen measured times, corresponding mean reading (in obtain DOC. data analyzed SPSS software, version 20. Descriptive statistics followed three-way analysis variance applied. Multiple comparisons made Scheffe post hoc tests (α 0.05). Results Filtek XT-A1-60sec presented with greatest (7.42 ± 0.47 mm), lowest obtained Empress-A3-20sec (2.31 0.21 mm). Direct 6.18 mm 3.59 mm, respectively. Statistically significant (p < 0.05) difference observed between interaction independent factors, namely composites, shade, time, revealed them contributed significantly ≤0.05). However, insignificant 0.148). Conclusion demonstrated greater than composite. An increase in enhanced irrespective shade. Regardless composite tested, lower for darker (A3).