الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Purpose: This in vitro scanning electron microscope study was performed to evaluate the influence of various polishing protocols on polyether-etherketone (PEEK) removable partial frameworks surface topography that fabricated by CAD / CAM. Materials and Methods : 3 modified PEEK removable partial denture frameworks fabricated by CAD/CAM techniques were examined by scanning electron micro-scope (SEM), after polishing by different polishing protocols. These modified PEEKframeworks were fitted over an epoxy resin model of maxillary class I Kennedy with remaining natural teeth extended from first premolar on one side to first premolar on the other side. According to polishing protocols the modified PEEK frameworks were divided into three groups: group I: modified PEEK frameworks without polishing, group II: modified PEEK frameworks polished with Abraso-Starglanz polishing system and, group III: modified PEEK frameworks polished with Acrypol polishing system. Surface topography was examined before and, after different polishing protocols and after 1440 insertion/ removing cycles.Statistical comparison between the different groupswas tested. Results: It was noted that (group I) showed the highest surface roughness while the lowest surface roughness and highly smooth surface was showed in (group II). By using Student’s t-test for comparing between groups, group II showed significance decrease in surface roughness compared to that in (group I) and group III where (p<0.001). Conclusions: Considering this study limitations, it was concluded that: Polishing PEEK framework with Abraso-starglaz paste was most effective and promising in producing highly smooth surface than Acrypol polishing paste. For the laboratory-based protocols, both Abraso-starglaz and, Acrypol polishing pastes produce a significantly smoothness peek surface more than non-polished peek.