The Effect of Light-Curing Duration and Different Composite Shades on Color Stability of Composite Resins

DOI

https://doi.org/10.2991/idsm-17.2018.22How to use a DOI?

Keywords

composite resin, color stability, light curing duration, composite shades, light-emitting diodes

Abstract

Aims of this study is to evaluate the effect of light-curing duration using light-emitting diodes (LED) curing units and different composite shades on the color stability of the composite resins. Specimens in four shades of two types of com-posite resin were prepared and polymerized with the LED curing unit. The initial color parameters (L*,a*,b*,E*) were done using a spectropho-tometer before sub-jected to a thermocycling regimen comprising of 500 cycles in water of 55˚C and 5˚C. The final color readout was then performed to determine the color changes using ANOVA and Tukey-Kramer post-hoc test. After thermocycling regimen, the mean delta E* of specimens were in the range of 1.67 to 4.78. The mean delta a* of specimens were mostly positive, while the mean delta L* and delta b* were mostly negative. There was perceptible color change in most of the specimens as they were mostly darker value (negative delta L*), shifted towards reddish discol-oration (positive delta a*) and blueish discoloration (negative delta b*). The color change experienced by the specimens could not be anticipated in relation to cur-ing duration and types of composite shades as the effect was more likely depend-ent on individual material composition rather than actual shade classification. Neither light-cure duration nor difference in shades had significant effect on the amount of color change in composite resins.

Open Access

This is an open access article distributed under the CC BY-NC license.