The Effect of Repeated Firings on the Shade of Porcelain Fused to Zirconia
Cardiff Metropolitan University
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Objectives The purpose of this study was to investigate whether repeated firings influence the shade of porcelain fused to zirconia. Materials and Methods A total of 18 disc shaped specimens were fabricated from yttria stabilized tetragonal zirconia and Cerabien ZR opaque and dentine porcelain in VITA shade A1. Each specimen was subjected to a total of six firings and colour differences after each firing were determined and recorded using a VITA Easyshade spectrophotometer. Delta values (ΔE*) for each sample were calculated using the CIELab formula, in order to compare the shade of the ceramic specimens as a single value. The one-way ANOVA test was performed to analyse the data for a significant difference. Results Perceptible differences in the colour of ceramic were present throughout the six firings, with the greatest change in shade occurring between the second and third firing. However, the VITA Classical shade of porcelain fused to zirconia generally remained unchanged. Conclusion It is suggested that repeated firings influence the shade of porcelain fused zirconia, as perceivable colour differences arise during the first six firings. Nevertheless, these changes in shade are considered clinically acceptable.
BSc (Hons) Dental Technology
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