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KMID : 0358920160430030275
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Journal of the Korean Academy of Pedodontics
2016 Volume.43 No. 3 p.275 ~ p.283
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Effects of Polishing Methods on the Surface Characteristics of Composite Resins
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Baik Min-Kyung
Kim Chong-Chul
Jang Ki-Taeg
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Abstract
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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 (FiltekTM Z250) and nanofilled (FiltekTM 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.
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KEYWORD
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Composite resin, Polishing method, Surface roughness, Surface morphology, Micro-hardness
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