الفهرس 
Introduction
Aim of the workOnly 14 pages are availabe for public view
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Abstract
The aim of this study was to determine the effect of two bleaching systems on an Ormocer and a conventional hybrid resin composites. Microleakage, hardness, roughness and color change of Ormocer (Admira / voco) and hybrid composites (Glacier/SDI) were determined before and after bleaching using two bleaching systems (Vivastyle paint on / Vivadent) (VSP) and Vivastyle /Vivadent) (VS) for two weeks. Both bleaching regimens significantly increased microleakage, decreased hardness, increased roughness and caused lighter color changes, but the effects caused by VSP were higher than those of VS. Ormocer achieved a light color changes on bleaching and showed greater resistance to adverse microleakage and hardness effects.