A Study on the Surface Characteristics of Resin Composites by Various One-step Polishing Systems

DOI Open Access
  • Eri SERITA
    Department of Clinical Biomaterials, Graduate School of Dentistry, Kanagawa Dental University
  • Katsura OHASHI
    Department of Clinical Biomaterials, Graduate School of Dentistry, Kanagawa Dental University
  • Tomotaro NIHEI
    Department of Clinical Biomaterials, Graduate School of Dentistry, Kanagawa Dental University

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  • ワンステップ研磨材によるコンポジットレジンの表面性状

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Abstract

 Purpose: Resin composites are widely used for the direct restoration of both anterior and posterior teeth because of the simple bonding procedure, esthetic demands by patients, and improved physical and mechanical properties of these materials. A smooth surface finish is clinically important, as it determines the esthetics and longevity of the composite restoration. The purpose of this study was to evaluate the surface roughness and surface glossiness of four commercial resin composites after polishing with four commercial one-step polishing systems.<br> Methods: A total of 200 specimens (11 mm in diameter, 3 mm thick) were prepared in polyethylene molds using four resin composites: Clearfil Majesty ES-2 (CME; Kuraray Noritake Dental), Filtek Supreme Ultra (FSU; 3M Health Care), Premise (PRM; Kerr) and EsteliteΣ Quick (ESQ; Tokuyama Dental). Control specimens received no polishing treatment (NP group), and the remaining specimens were randomly polished using the CR Polisher PS (CP; Shofu), Opti One Step Polisher (OS; Kerr), PoGo (PG; Dentsply Sankin) or I-Pol (IP; Heraeus Kulzer Japan) system for 30 seconds after being wet-ground with 600-grid silicon carbide paper (#600 group). The average surface roughness (Ra) of each polished specimen was determined with a profilometer (Surfcom590A, Tokyo Seimitsu). The surface glossiness (GS60°) was also determined with a gloss meter (GM-268Plus, Konica Minolta). The data were analyzed using one-way ANOVA followed by Tukey's multiple comparison test. Pearson's correlation coefficient (α=0.05) was calculated to analyze the correlation between surface roughness and surface gloss.<br> Results: In all specimens, the roughest surface was observed for the NP group of CME. On the other hand, the smoothest surface was obtained for the IP group of PRM. The highest glossiness value for all specimens was the OS group of FSU. Among all the one-step polishing systems tested, the OS and IP groups exhibited smoother surface and higher gloss for all resin composites. A moderate negative correlation between surface roughness and gloss was found from Pearson's correlation analysis.<br> Conclusion: From these results, it was suggested that the effectiveness of the current one-step polishing systems differed depending on the kind of polished resin composites.

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