Color stability of esthetic ion-releasing restorative materials subjected to pH variations

Imparato, J.C.P., Garcia, A., Bonifacio, C.C., Scheidt, L., Raggio, D.P. ORCID: https://orcid.org/0000-0002-0048-2068, Mendes, F.M. and Vedovello Filho, M. 2007. Color stability of esthetic ion-releasing restorative materials subjected to pH variations. Journal of Dentistry for Children 74 (3) , pp. 189-193.

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Abstract

Purpose: The purpose of this study was to evaluate the color stability of 3 types of fluoride-releasing restorative esthetic materials when exposed to pH variations: (1) a polyacid-modified resin composite; (2) a resin-modified glass ionomer cement; and (3) a conventional glass ionomer cement in 2 different storage conditions. Methods: Five samples of each material were stored in artificial saliva (pH 6.8) for 28 days. Five other samples were submitted for a pH-cycling during the same 28 days, which were immersed daily in a demineralizing solution (pH 4.5) for 7.5 hours and in a remineralizing solution (pH 7.0) for 16 hours. Color parameters were analyzed in a reflectance spectrophotometer to evaluate the color changes using the CIE L*a*b* measuring system, after 7 and 28 days. The results were submitted to analysis of variance and Tukey tests. Results: There was no difference in the same material concerning the different storage conditions. Conventional glass ionomer cement, however, showed greater color stability in relation to resin-modified glass ionomer cement (P<.05) and to polyacid-modifified resin composite (P<.01). Conclusions: There were no significant color changes due to pH variations, and conventional glass ionomer cement presented greater color stability.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Dentistry
Publisher:	American Academy of Pediatric Dentistry
ISSN:	1551-8949
Last Modified:	10 Nov 2022 10:58
URI:	https://orca.cardiff.ac.uk/id/eprint/148841

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