الفهرس 
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Abstract
The aim of this study was to evaluate the influence of different
polishing techniques on the surface roughness and micro-hardness of two resin
composites.
Materials and Methods: Two resin composites (Filtek Supreme XT; nanofilled
composite and Filtek Z250; microhybrid composite) were used. Sixty specimens of
each material were prepared and divided into two finishing and polishing subgroups:
(i) PoGo, One step polishing system, (ii) Sof-Lex discs, multi-steps finishing and
polishing system. Then each subgroup was stored in distilled water at 37°c for
testing period, i.e. immediately, after one month and three months respectively. The
finished and polished surfaces were subjected to profilometric evaluation and microhardness
testing.
Results: one-step system has higher surface roughness than multi-steps at
different periods storage in distilled water for microhybrid composite. But for
nanofilled resin composite, no significant difference was found between two
polishing modalities at immediate. But, after storage in distilled water in one or three
months, significant difference in surface roughness could be found between two
[2]
polishing modalities. With respect to micro-hardness