Surface roughness of novel resin composites polished with one-step systems.
OBJECTIVE
This study: 1) analyzed the surface roughness of five novel resin composites that contain nanoparticles after polishing with three different one-step systems and 2) evaluated the effectiveness of these polishers and their possible surface damage using scanning electron microscope (SEM) analysis.


METHODS
The resin composites evaluated in this study include CeramX, Filtek Supreme XT, Grandio, Premise and Tetric EvoCeram. A total of 100 discs (20/resin composites, 10 x 2 mm) were fabricated. Five specimens/resin composites cured under Mylar strips served as the control. The samples were polished for 30 seconds with PoGo, OptraPol and One Gloss discs at 15,000 rpm using a slow speed handpiece. The surfaces were tested for roughness (Ra) with a surface roughness tester and examined with SEM. One-way ANOVA was used for statistical analysis (p = 0.05).


RESULTS
For all the composites tested, differences between the polishing systems were found to be significant (p < 0.05). For Filtek Supreme XT, Mylar and PoGo created equally smooth surfaces, while significantly rougher surfaces were obtained after OptraPol and One Gloss applications. For Grandio, Mylar and PoGo created equally smooth surfaces, while OptraPol and One Gloss produced equally rougher surfaces. Tetric EvoCeram exhibited the roughest surface with OptraPol, while no significant differences were found between Premise and CeramX. According to SEM images, OptraPol and One Gloss scratched and plucked the particles away from the surface, while PoGo created a uniform finish, although the roughness values were not the same for each composite.


CONCLUSIONS
Effectiveness of the polishers seems to be material dependent.
Ergücü
Z
Z
Ege University School of Dentistry, Department of Restorative Dentistry, Izmir, Turkey. zergucu@yahoo.com
Türkün
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D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods*; D005898:Glass / Q000737:chemistry; D006801:Humans; D006813:Humidity; D008027:Light; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry; D011093:Polyethylene Terephthalates / Q000737:chemistry; D011829:Radiation Dosage; D013499:Surface Properties; D013696:Temperature
C520091:CeramX; D003188:Composite Resins; D003764:Dental Materials; C474035:Filtek Supreme; C509998:Grandio; D011093:Polyethylene Terephthalates; C501891:Tetric EvoCeram; C507210:premise composite resin; C025539:Lavsan