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J Appl Oral Sci. 2011 Apr;19(2):154-60.

Difference in the color stability of direct and indirect resin composites.

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  • 1Institute for Clinical Performance of Biomaterials, Seoul, Korea. isi@m.tohoku.ac.jp

Abstract

Indirect resin composites are generally regarded to have better color stability than direct resin composites since they possess higher conversion degree.

OBJECTIVE:

The present study aimed at comparing the changes in color (ΔE) and color coordinates (ΔL, Δa and Δb) of one direct (Estelite Sigma: 16 shades) and 2 indirect resin composites (BelleGlass NG: 16 shades; Sinfony: 26 shades) after thermocycling.

MATERIAL AND METHODS:

Resins were packed into a mold and light cured; post-curing was performed on indirect resins. Changes in color and color coordinates of 1-mm-thick specimens were determined after 5,000 cycles of thermocycling on a spectrophotometer.

RESULTS:

ΔE values were in the range of 0.3 to 1.2 units for direct resins, and 0.3 to 1.5 units for indirect resins, which were clinically acceptable (ΔE<3.3). Based on t-test, ΔE values were not significantly different by the type of resins (p>0.05), while ΔL, Δa and Δb values were significantly different by the type of resins (p<0.05). For indirect resins, ΔE values were influenced by the brand, shade group and shade designation based on three-way ANOVA (p<0.05).

CONCLUSION:

Direct and indirect resin composites showed similar color stability after 5,000 cycles of thermocycling; however, their changes in the color coordinates were different.

PMID:
21552717
[PubMed - indexed for MEDLINE]
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