The effect of ceramic thickness and number of firings on the color of ceramic systems: An in vitro study
| Autor: | Ertugrul Ercoban, Kursat Eser, Bulent Uludag, Aslihan Usumez, Volkan Sahin |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Engineering drawing
Hot Temperature Materials science Prosthesis Coloring Surface Properties Colorimeter Significant difference Analytical chemistry Color matching Esthetics Dental Dental Porcelain Models Dental Dental porcelain Dental Prosthesis Design Color changes visual_art Materials Testing Technology Dental visual_art.visual_art_medium In vitro study Color data Ceramic Oral Surgery |
| Zdroj: | The Journal of Prosthetic Dentistry. 97:25-31 |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/j.prosdent.2006.11.002 |
| Popis: | Although all-ceramic restorations are widely used, there is a lack of information on how color is affected by fabrication procedures. Color matching problems may be encountered in a definitive restoration despite careful shade selection.The aim of this study was to evaluate the effect of dentin ceramic thickness and repeated firings on the color of glass-infiltrated aluminum-oxide (In-Ceram) and leucite-reinforced (IPS Empress) all-ceramic systems using a colorimeter.Twenty-one disc-shaped specimens, 10 mm in diameter with a 0.6-mm core thickness and 0.5-, 1-, or 1.5-mm dentin ceramic thickness, were made from each of 2 ceramic systems (n=7) . Repeated firings were performed for each group, and the color differences were compared with the color after the initial firing. Color differences among ceramic specimens were measured using a colorimeter (XL-20 Colorimeter), and data were expressed in Commission Internationale d'Eclairage (CIE) LAB system coordinates. Repeated-measures analysis of variance was used to analyze the data (number of firings, ceramic brand, and ceramic thickness) for significant differences. The Tukey honestly significant difference test and paired 2-tailed tests were used to perform multiple comparisons (alpha=.05).The L( *)a( *)b( *) values of ceramic systems were affected by the number of firings (3, 5, or 7) (P.01) and ceramic brand (In-ceram or IPS Empress) (P.01). L( *) and a( *) values were affected by ceramic thickness (0.5, 1, or 1.5 mm) (P.01); however, b( *) value was not affected by ceramic thickness (P=.075). Significant interactions were present in L( *), a( *), b( *) values between number of firings and ceramic brand (P.01), and between ceramic brand and ceramic thickness (P.05). Significant interactions were present between number of firings and ceramic thickness (P.01) in L( *) and b( *) values but not in the a( *) value (P=.379).The analysis revealed that there were substantial changes in L( *)a( *)b( *) color data as the number of firings increased, which resulted in perceptual color changes in L( *)a( *)b( *) color parameters. |
| Databáze: | OpenAIRE |
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