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Master's Dissertation
DOI
https://doi.org/10.11606/D.23.2006.tde-31102006-092528
Document
Author
Full name
Marcelo Weber
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Saito, Tetsuo (President)
Arita, Emiko Saito
Tanaka, Celso Shin Ite
Title in Portuguese
"Estudo espectrofotométrico comparativo da estabilidade de cor de três porcelanas dentais após consecutivas queimas"
Keywords in Portuguese
Estabilidade de cor
Estudo espectrofotométrico
Porcelana dental
Abstract in Portuguese
O objetivo deste estudo foi avaliar a estabilidade de cor de três marcas comerciais de porcelanas aluminizadas durante seu processo de queima. Para o experimento foram confeccionados 30 corpos de prova em forma de disco com 2mm de espessura e 10mm de circunferência, sendo 10 da marca ALLCeram, 10 da marca Noritake Cerabien CZR e 10 da marca Vita VM7. As amostras foram queimadas 10 vezes. As leituras de cor foram feitas em espectrofotômetro de reflexão nos seguintes intervalos: após a 1ª queima, após a 3ª queima, após a 5ª queima e após a 10ª queima. As curvas de reflexão foram convertidas em valores LAB e a diferença de cor foi medida através do método CIELAB (FE). Os resultados obtidos demonstraram que existe variação de cor e que esta variação depende do número de queimas realizadas e da marca comercial utilizada.
Title in English
Comparative spectrophotometric study of the color stability of three dental porcelains after repeated firings
Keywords in English
Color stability
Dental porcelain
Spectrophotometric study
Abstract in English
The purpose of this investigation was to quantify in CIE FE units the differences in color produced by multiple firing of three allceramic systems. For this study 30 samples were fabricated of 3 brands: AllCeram, Noritake Cerabien CZR and Vita VM7. A spectrophotometer was used for reflectance measurement of color after 1 firing, 3 firings, 5 firings and 10 firings. The results were converted in CIELAB units. Color differences, FE, were calculated in the CIE color space. Color differences as a result of multiple firings depended on the number of firings and the brand tested.
 
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MarceloWeber.pdf (344.48 Kbytes)
Publishing Date
2007-04-03
 
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