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http://dx.doi.org/10.14368/jdras.2019.35.1.1

Effect of polishing methods on color change by water absorption in several composite resins  

Kim, Hye Jin (Department of Conservative Dentistry, Veterans Health Service Medical Center)
Kim, Mi-yeon (Department of Conservative Dentistry, Veterans Health Service Medical Center)
Song, Byung-chul (Department of Conservative Dentistry, Veterans Health Service Medical Center)
Kim, Sun-ho (Department of Conservative Dentistry, Veterans Health Service Medical Center)
Kim, Jeong-hee (Department of Conservative Dentistry, Veterans Health Service Medical Center)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.35, no.1, 2019 , pp. 1-10 More about this Journal
Abstract
Purpose: The aim of this study was to evaluate the influence of polishing methods on the color stability of composite resins. Materials and Methods: Two bulk-fill and four conventional resin composites were filled in cylindrical molds (6 mm diameter, 4 mm height) and light-cured. The specimens were stored in $34^{\circ}C$ distilled water for 24 h. Spectrophotometer was used to determine the color value according to the CIE $L^*a^*b^*$ color space. Each group was divided into three groups according to polishing methods (n = 5). Group 1 was control group (Mylar strip group), group 2 was polished with PoGo, and group 3 was polished with Sof-Lex Spiral wheels. Color evaluation was performed weekly for 4 weeks after immersion in $34^{\circ}C$ distilled water. The results were analyzed by generalized least squares method (P < 0.05). Results: Generalized least squares analysis revealed that Sof-Lex Spiral wheels group showed the significantly lower ${\Delta}E$ values compared to PoGo and control group (P < 0.05). The ${\Delta}E$ values of polished group showed the significantly lower than the ${\Delta}E$ values of unpolished group (P < 0.05). Regarding color changes of composite resins, there was no significant difference between the ${\Delta}E$ values of Filtek Z250 and Filtek Z350 XT Universal restorative in all time intervals (P < 0.05). Tetric N-Ceram Bulk Fill showed the significantly lower ${\Delta}E$ values compared to other composite resins in 1, 2, 3 weeks (P < 0.05). Conclusion: Within the limitations of this study, polishing methods influence the color stabilities of composite resins. The group polished with Sof-Lex Spiral Wheels showed more resistance to discoloration than group polished with PoGo.
Keywords
bulk-fill resin; color stability; composite resins; polishing methods; Sof-Lex Spiral wheels;
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