Effect of polishing methods on color change by water absorption in several composite resins
10.14368/jdras.2019.35.1.1
- Author:
Hye Jin KIM
1
;
Mi Yeon KIM
;
Byung Chul SONG
;
Sun Ho KIM
;
Jeong Hee KIM
Author Information
1. Department of Conservative Dentistry, Veterans Health Service Medical Center, Seoul, Republic of Korea. endo95@naver.com
- Publication Type:Original Article
- Keywords:
bulk-fill resin;
color stability;
composite resins;
polishing methods;
Sof-Lex Spiral wheels
- MeSH:
Absorption;
Composite Resins;
Fungi;
Immersion;
Least-Squares Analysis;
Methods;
Water
- From:Journal of Dental Rehabilitation and Applied Science
2019;35(1):1-10
- CountryRepublic of Korea
- Language:English
-
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℃ 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℃ 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 ΔE values compared to PoGo and control group (P < 0.05). The ΔE values of polished group showed the significantly lower than the ΔE values of unpolished group (P < 0.05). Regarding color changes of composite resins, there was no significant difference between the ΔE 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 ΔE 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.
