Color stability of composites subjected to accelerated aging after curing using either a halogen or a light emitting diode source

Fernanda De Carvalho Panzeri Pires-De-Souza,Luciana Assirati Casemiro,Hisham Mohamad Hamida,Lucas Da Fonseca Roberti Garcia

doi:10.1590/s0103-64402007000200006

Fernanda De Carvalho Panzeri Pires-De-Souza, Luciana Assirati Casemiro + Show 2 more

Open Access

https://doi.org/10.1590/s0103-64402007000200006

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Abstract

The purpose of this study was to evaluate, in vitro, the color stability of three composite resins of two different shades (A3 and C3) cured with either a quartz tungsten halogen (QTH) or a light emitting diode (LED) source. Forty specimens (20 x 2 mm) were prepared for each composite (Tetric Ceram, Heliomolar and Esthet-X), being 20 for each shade. In each group, 10 specimens were light-cured using the QTH unit and 10 with the LED source. The shade of the materials was evaluated before and after submitting the specimens to artificial accelerated aging (4 h UV-B/4 h condensing vapor), using a reflection spectrophotometer. deltaE means were calculated and analyzed statistically by 2-way ANOVA and Tukey's test at 5% significance level. Both A3 and C3 shades of Esthet-X composite resin showed the lowest color change when cured with the QTH light, while Tetric C3 cured with the QTH light showed the highest color change.

Highlights

Esthetic failure is one of the most common reasons for the replacement of restorations
The composites were inserted into the matrix cavity incrementally (2-mmthick increments) and each increment was cured using either a quartz tungsten halogen (QTH) lamp (Ultralux; Dabi Atlante, Ribeirão Preto, SP, Brazil; ≅500 mW/cm2) or a light emitting diode (LED) source (Ultraled; Dabi Atlante; ≅320 mW/cm2), for the time recommended by the manufacturers
A polyester strip was placed onto the composite in order to increase surface smoothness and facilitate polishing subsequently

Summary

Introduction

Esthetic failure is one of the most common reasons for the replacement of restorations. A good combination of the tooth color and the initial color of the material before curing is an important clinical factor for a clinically successful outcome. This combination must remain after the material is completely cured and throughout the restoration life-time. If the color of the composite changes with time, its main advantage, esthetics, is lost. For this reason, studies have been performed with the goal of assessing the maximum color stability of composites through time [1,2]. Self-curing composites show a higher discoloration than light-cured ones [7], which suggests that the

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