الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The present study was aimed to evaluate the surface roughness of four resin composite restorative materials finished/polished with a new one-step and two conventional multi-step polishing systems. Specimens {n=160} measuring 8-mm in diameter and 2-mm in thickness were fabricated in a Teflon mold covered with a Mylar strip using four resin composites. The specimens that were used for surface roughness evaluation were used for bacterial adhesion evaluation. For all the restorative composite resins tested, for Filtek Supreme, Tetric EvoCeram and Z100, none of the polishing systems could produce smooth surfaces similar toMylar strip{p<.05}. PoGo created smoother surfacea for Filtek Supreme and Admira. Admira and Tetric EvoCeram surfaces were found to be more adhesive to different streptococci tested. The polishing effect of PoGo was worse than Mylar but still better than other polishing systems. Ormocer and nano hybrid composite resins exhibit high bacterial adhesion values compared with nano filled and hybrid composite resins.