Restor Dent Endod.  2015 Nov;40(4):270-276. 10.5395/rde.2015.40.4.270.

Effect of immersion into solutions at various pH on the color stability of composite resins with different shades

• Moon JD
• Seon EM
• Son SA
• Jung KH
• Kwon YH
• Park JK

• KMID: 2316946
• DOI: http://doi.org/10.5395/rde.2015.40.4.270

Abstract

OBJECTIVES
This study examined the color changes of a resin composite with different shades upon exposure to water with different pH.
MATERIALS AND METHODS
Nanohybrid resin composites (Filtek Z350XT, 3M ESPE) with four different shades (A2, A3, B1, and B2) were immersed in water with three different pH (pH 3, 6, and 9) for 14 day. The CIE L*a*b* color coordinates of the specimens were evaluated before and after immersion in the solutions. The color difference (DeltaE*) and the translucency parameter (TP) were calculated using the color coordinates.
RESULTS
DeltaE* ranged from 0.33 to 1.58, and the values were affected significantly by the pH. The specimens immersed in a pH 6 solution showed the highest DeltaE* values (0.87 - 1.58). The specimens with a B1 shade showed the lowest DeltaE* change compared to the other shades. TP ranged from 7.01 to 9.46 depending on the pH and resin shade. The TP difference between before and after immersion in the pH solutions was less than 1.0.
CONCLUSIONS
The resulting change of color of the tested specimens did not appear to be clinically problematic because the color difference was < 1.6 in the acidic, neutral, and alkaline solutions regardless of the resin shade, i.e., the color change was imperceptible.

Keyword

Color stability; Composite resin; pH; Resin shade; Translucency parameter

MeSH Terms

Composite Resins*
Hydrogen-Ion Concentration*
Immersion*
Water
Composite Resins
Water

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