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http://dx.doi.org/10.5933/JKAPD.2016.43.3.275

Effects of Polishing Methods on the Surface Characteristics of Composite Resins  

Baik, Min-Kyung (Department of Pediatric Dentistry, School of Dentistry, Seoul National University)
Kim, Chong-Chul (Department of Pediatric Dentistry, School of Dentistry, Seoul National University)
Jang, Ki-Taeg (Department of Pediatric Dentistry, School of Dentistry, Seoul National University)
Publication Information
Journal of the korean academy of Pediatric Dentistry / v.43, no.3, 2016 , pp. 275-283 More about this Journal
Abstract
The aim of this study was to evaluate the surface characteristics of composite resins polished with two different polishing methods. 30 disk-shaped specimens were prepared with microhybrid (Filtek$^{TM}$ Z250) and nanofilled (Filtek$^{TM}$ Z350) resins respectively, and classified into three groups: not polished as controls, polished by an abrasive disk (Soflex), and polished by a polishing brush (Occlubrush). Surface roughness was increased after polishing. In terms of micro-roughness, there were no significant differences between the two polishing methods. But macro-roughness values were markedly increased in the Occlubrush group (p < 0.05). In the Sof-lex group, the matrix and fillers were polished together, resulting into a smoother and homogeneous surface. However, in the Occlubrush group, the matrix layer was torn off, with more heterogeneous surfaces and large scratches. In regards to micro-hardness, no significant differences were observed between the two polishing systems (p > 0.05). And the hardness value increased about 25% after polishing. In conclusion, the method of polishing should be chosen deliberately in view of the hardness characteristics of composite resins. Sof-lex is recommended to improve the surface characteristics of polished resins.
Keywords
Composite resin; Polishing method; Surface roughness; Surface morphology; Micro-hardness;
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