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

• Published in: Journal of Dental Rehabilitation and Applied Science Vol. 35; no. 1; pp. 1 - 10
• Main Authors: Kim, Hye Jin, Kim, Mi-yeon, Song, Byung-chul, Kim, Sun-ho, Kim, Jeong-hee
• Format: Journal Article
• Language: English
• Published: 대한턱관절교합학회 30.03.2019
• Subjects: 치의학; color stability; 색조 안정성; 연마 방법; bulk-fill resin; Sof-Lex Spiral wheels; composite resins; polishing methods; 벌크필레진; 복합레진
• ISSN: 2384-4353; 2384-4272
• DOI: 10.14368/jdras.2019.35.1.1

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°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°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 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. KCI Citation Count: 0