Please use this identifier to cite or link to this item:
Type: Artigo
Title: Color stability of dental ceramics submitted to artificial accelerated aging after repeated firings
Author: Pires-de-Souza, Fernanda de Carvalho Panzeri
Casemiro, Luciana Assirati
Garcia, Lucas da Fonseca Roberti
Cruvinel, Diogo Rodrigues
Abstract: Statement of problem: Color stability is an important factor to ensure the long-term clinical success of ceramic restorations. There is a lack of information on how color is affected by fabrication procedures, such as the number of firings. Purpose: The purpose of this study was to evaluate the effects that the number of firings and type of substrate have on the color stability of dental ceramic submitted to artificial accelerated aging. Material and methods: Sixty specimens were fabricated: 30 metal ceramic (Verabond II + IPS d.SIGN) and 30 all-ceramic (IPS d.SIGN). Specimens were divided into 3 groups (n=10), and submitted to 2, 3, or 4 firings (±900°C), respectively, according to the manufacturer's instructions. Color readings were obtained with a spectrophotometer before and after artificial accelerated aging, and L*, a*, and b* coordinates and total color variation (ΔE) were analyzed (2-way ANOVA, Bonferroni, α=05). Results: For metal ceramic specimens, differences for the L* coordinates were significant (P<.05) only for the group submitted to 3 firings. With respect to the all-ceramic specimens, smaller L* coordinates were obtained for greater a* and b* coordinates, indicating that the greater the number of firings, the darker and more reddish/yellowish the specimen. All ΔE values, for all groups, were below 1.0. All-ceramic specimens submitted to 3 and 4 firings presented ΔE means differing statistically (P<.05) from those of the metal ceramic group. Conclusions: The type of substrate and number of firings affected the color stability of the ceramic material tested. Artificial accelerated aging did not produce perceptible color stability changes (ΔE<1.0).
Subject: Restauração (Odontologia)
Country: Estados Unidos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/S0022-3913(08)60282-6
Date Issue: 2009
Appears in Collections:FOP - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
19105987.pdf502.8 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.