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AbstractBackground: This study investigated the influence of composite type and shade ondepth of cure of light- activated composites.Materials and methods: This study investigated the depth of cure of two compositematerials using two different shades. Parameters included two shades (A1 and C3) oftwo different light-activated composites(Helio Progress and King Dental) cured for 40seconds.Results: Statistical analysis of the data by using the one-way analysis of variancerevealed that, both composite type and shade significantly affect composite depth ofcure.Conclusion: This study indicated that, Although, both composite type and shade weresignificantly affect depth of cure but the effect of composite type on composite depthof cure is much more than that of composite shade.

Resin composite --- composite shade --- composite depth of cure and composite photo-activation.