J Dent Rehabil Appl Sci.  2019 Mar;35(1):1-10. 10.14368/jdras.2019.35.1.1.

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

• Kim HJ
• Kim MY
• Song BC
• Kim SH
• Kim JH

• KMID: 2450920
• DOI: http://doi.org/10.14368/jdras.2019.35.1.1

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.

Keyword

bulk-fill resin; color stability; composite resins; polishing methods; Sof-Lex Spiral wheels

MeSH Terms

Absorption*
Composite Resins*
Fungi
Immersion
Least-Squares Analysis
Methods*
Water*
Composite Resins
Water

Figure

• 

  Fig. 1 Mean values (SD) of color changes (ΔE) of the composite resins according to polishing system after 1 week. Same uppercase letters indicate insignificant differences between composite resins (P < 0.05). Same lowercase letters indicate insignificant differences between polishing procedures (P < 0.05). Filtek Z350U: Filtek Z350 Universal restorative; Filtek Z350F: Filtek Z350 Flowable restorative; Filtek BF: Filtek Bulk Fill; Tetric N Ceram BF: Tetric N-Ceram Bulk Fill.

• 

  Fig. 2 Mean values (SD) of color changes (ΔE) of the composite resins according to polishing system after 2 weeks. Same uppercase letters indicate insignificant differences between composite resins (P < 0.05). Same lowercase letters indicate insignificant differences between polishing procedures (P < 0.05).

• 

  Fig. 3 Mean values (SD) of color changes (ΔE) of the composite resins according to polishing system after 3 weeks. Same uppercase letters indicate insignificant differences between composite resins (P < 0.05). Same lowercase letters indicate insignificant differences between polishing procedures (P < 0.05).

• 

  Fig. 4 Mean values (SD) of color changes (ΔE) of the composite resins according to polishing system after 4 weeks. Same uppercase letters indicate insignificant differences between composite resins (P < 0.05). Same lowercase letters indicate insignificant differences between polishing procedures (P < 0.05).

Reference

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