Korean J Dent Mater.  2018 Sep;45(3):187-198. 10.14815/kjdm.2018.45.3.187.

Effect of powder-liquid ratios and powder colors on color stability of 4-META / MMA-TBB resin after immersion in coffee

Affiliations
  • 1Clinical professor, Department of Conservative Dentistry, Wonkwang University Dental Hospital, Iksan, Korea.
  • 2Adjunct professor, Department of Conservative Dentistry, College of Dentistry, Wonkwang University, Iksan, Korea.
  • 3Associate professor, Department of Conservative Dentistry, College of Dentistry, Wonkwang University, Iksan, Korea. conspsj@wku.ac.kr

Abstract

The aim of this study was to evaluate the color stability of 4-methacryloxyethyl trimellitate anhydride (4-META) / methyl methacrylate (MMA) & tri-n-butylborane (TBB) resin with different powder-liquid (P/L) ratios and powder colors after immersion in coffee. Experimental groups (Bondfill SB) were classified by the P/L ratio (0.8:1 / 1:1 / 1.2:1, weight [wt] %) and color of the powder (light / medium). Light-cured resin composite (Filtek Z350 XT flowable) was used as a control group. Each disk-shaped specimen of 7 groups (n = 8 for color difference, n = 10 for translucency parameter [TP]) was immersed in a staining solution of coffee for 4 weeks. The color of the specimen was measured at the time of baseline, 1 day, 1 week, 2 weeks, 3 weeks, and 4 weeks with a spectrophotometer. The color difference (ΔE) and changes in translucency parameter (ΔTP) were statistically analyzed by one-way analysis of variance (ANOVA), followed by Tukey's post-hoc test. Independent t-test was applied to evaluate the effect on the colors of the powder (α = 0.05). The values of color difference (ΔE) of the experimental groups were within the clinically acceptable threshold (ΔE < 3.3), whereas control group showed values over 3.3 after 1 week of immersion. The values of TP ranged from 9.58 to 13.28. The differences of TP (ΔTP) between baseline and 4 weeks were less than 1.0, except in the control group. Conclusively, self-cured resin composite showed excellent color stability in coffee for the period of this study regardless of different P/L ratios and powder colors.

Keyword

Self-cured resin composite; 4-META/MMA-TBB; Color stability; Translucency parameter

MeSH Terms

Coffee*
Immersion*
Coffee
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