Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5098
Título: Color and Luminescence stability of selected dental materials in vitro
Autor: Gawriolek, Maria
Sikorska, Ewa
Ferreira, Luís F. V.
Costa, Alexandre I.
Khmelinskii, Igor
Sikorski, Marek
Koczorowski, Ryszord
Krawczyk, Alina
Palavras-chave: Color and Luminescence
Color Difference Values
Color Parameters
Dental Composites
Laser-Induced Luminescence
Staining Drinks
Total Luminescence Matrices
Color Difference Values
Resin Composites
Fluorescent Emission
Benzil Inclusion
Different Drinks
Data: Fev-2012
Editora: American College of Prosthodontists
Citação: GAWRIOLEK, M.; [et al] – Color and Luminescence stability of selected dental materials in vitro. Journal of Prosthodontics. ISSN: 1059941X. Vol. 21, nr. 2 (2012), pp. 112-122
Resumo: To study luminescence, reflectance, and color stability of dental composites and ceramics. Materials and Methods: IPS e.max, IPS Classic, Gradia, and Sinfony materials were tested, both unpolished (as-cast) and polished specimens. Coffee, tea, red wine, and distilled water (control) were used as staining drinks. Disk-shaped specimens were soaked in the staining drinks for up to 5 days. Color was measured by a colorimeter. Fluorescence was recorded using a spectrofluorometer, in the front-face geometry. Time-resolved fluorescence spectra were recorded using a laser nanosecond spectrofluorometer. Results: The exposure of the examined dental materials to staining drinks caused changes in color of the composites and ceramics, with the polished specimens exhibiting significantly lower color changes as compared to unpolished specimens. Composites exhibited lower color stability as compared to ceramic materials. Water also caused perceptible color changes in most materials. The materials tested demonstrated significantly different initial luminescence intensities. Upon exposure to staining drinks, luminescence became weaker by up to 40%, dependent on the drink and the material. Time-resolved luminescence spectra exhibited some red shift of the emission band at longer times, with the lifetimes in the range of tens of nanoseconds. Conclusions: Unpolished specimens with a more developed surface have lower color stability. Specimens stored in water develop some changes in their visual appearance. The presently proposed methods are effective in evaluating the luminescence of dental materials. Luminescence needs to be tested in addition to color, as the two characteristics are uncorrelated. It is important to further improve the color and luminescence stability of dental materials.
Peer review: yes
URI: http://hdl.handle.net/10400.21/5098
DOI: 10.1111/j.1532-849X.2011.00808.x
ISSN: 1059941X
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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