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Revista Cubana de Estomatología
On-line version ISSN 1561-297X
Abstract
RAMIREZ FERNANDEZ, Lisandra et al. Does glycerin influence the color stability of composite resin?. Rev Cubana Estomatol [online]. 2022, vol.59, n.2 Epub Mar 20, 2022. ISSN 1561-297X.
Introduction:
The effect of oxygen on the surface of resins at the moment of photopolymerization creates a layer which is susceptible to pigments. The use of glycerin may block this effect.
Objective:
Determine whether there is a difference in the color stability of nanohybrid composite resin subjected to a coloring agent when glycerin is either applied or not applied.
Methods:
Sixty resin disks were distributed into Group 1 (without glycerin) and Group 2 (with glycerin). Photopolymerization was performed for 20 s with a Bluephase®N LED lamp. The first color measurement was taken with an Easyshase®V spectrophotometer, recording the values obtained for L* (luminosity), a* (red-green axis) and b* (blue-yellow axis). The second color measurement was taken after immersion of the samples for one month in Coca-Cola®, maintaining them in an incubator at 37ºC. Statistical data analysis was performed with Student's t test to determine the color stability changes occurring in the two groups and compare them.
Results:
Color stability changes were observed in all the resin samples. Mean distance between initial and final color was ΔE = 6.91 in Group 1 and ΔE = 3.74 in Group 2. A statistically significant difference was found between the two groups analyzed (p < 0.001).
Conclusions:
Glycerin is an effective substance to block the effect of oxygen on the resin surface, preventing the formation of an oxygen-inhibited layer and raising the color stability of the nanohybrid composite resin.
Keywords : composite resin; coloring; agent; glycerin.