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여러 복합레진에서 수분 흡수에 의한 색변화에 연마가 미치는 영향
Effect of polishing methods on color change by water absorption in several composite resins
J Dent Rehabil Appl Sci 2019;35(1):1-10
Published online March 30, 2019
© 2019 Korean Academy of Stomatognathic Function and Occlusion.

김혜진, 김미연, 송병철, 김선호, 김정희*
Hye Jin Kim, Mi-yeon Kim, Byung-chul Song, Sun-ho Kim, Jeong-hee Kim*

한국보훈복지공단 중앙보훈병원 치과보존과

Department of Conservative Dentistry, Veterans Health Service Medical Center, Seoul, Republic of Korea
Jeong-hee Kim, Professor, Department of Conservative Dentistry, Veterans Health Service Medical Center, 53 Jinhwangdo-ro 61-gil, Gangdong-gu, Seoul, 05368, Korea, Tel: +82-2-2225-1925, Fax: +82-2-2225-1659, E-mail: endo95@naver.com
Received August 18, 2018; Revised December 2, 2018; Accepted December 3, 2018.
cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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°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.
Keywords : bulk-fill resin; color stability; composite resins; polishing methods; Sof-Lex Spiral wheels


March 2019, 35 (1)
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Funding Information
  • A VHS Medical Center Research Grant
     
      VHSMC 18022