Effect of different fabrication steps on color and translucency of a CAD-CAM feldspathic ceramic.
CAD-CAM blocks
color
feldspathic ceramics
relative translucency parameter
Journal
Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]
ISSN: 1708-8240
Titre abrégé: J Esthet Restor Dent
Pays: England
ID NLM: 101096515
Informations de publication
Date de publication:
10 2021
10 2021
Historique:
revised:
18
02
2021
received:
30
04
2020
accepted:
22
04
2021
pubmed:
2
6
2021
medline:
26
10
2021
entrez:
1
6
2021
Statut:
ppublish
Résumé
To evaluate color differences (ΔE) of different fabrication steps performed on a feldspathic ceramic and relative translucency parameter (RTP) after glazing; and to evaluate their effects on the color parameters: L*, a* and b*. Computer-aided design/computer-aided manufacturing (CAD-CAM) feldspathic maxillary right central incisor ceramic crowns (Cerec Blocs; 1.4 mm thickness) were fabricated through scanning a model preparation and milling. A total of 20 specimens were used and different parameters were compared with each other for color difference (ΔE): original block, milling, polishing, glazing and try-in cements; RTP was measured after glazing. Color parameters (L*, a*, and b*) were evaluated after each step with a spectrophotometer (Vita Easyshade V) and compared using the CIEDE2000 formula. Statistical analyses were done using one-way ANOVA and post-hoc tests. The highest ΔE value was observed for Original versus Milling group (4.73) and the lowest for Polishing versus Glazing (0.49). RTP after glazing presented a value of 12.01. L*, a*, and b* parameters were different among groups. Milling group was the one that presented more differences compared to the Original block regarding L*, a*, and b* parameters. Different fabrication steps resulted in perceptible color differences within themselves, and L*, a*, and b* parameters changed according to each step. All milling specimens presented unacceptable color differences when compared to the other steps, and milling specimens showed all color parameters (L*, a*, and b*) statistically different compared to the Original block. A high RTP value was observed, demonstrating that, at 1.4 mm thickness, the feldspathic ceramic presented high translucency, showing that opacification of substrate might be necessary. Different fabrication steps can greatly affect the optical properties of the feldspathic ceramic restoration studied and cause a relevant impact when compared to the ceramic block itself. Crowns evaluated right after milling presented the highest color differences. In order to obtain optical properties as close as possible to the original feldspathic ceramic block, either polishing or polishing and glazing needs to be performed.
Substances chimiques
Dental Porcelain
12001-21-7
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Pagination
1038-1044Subventions
Organisme : Fondo Nacional de Desarrollo Científico y Tecnológico
ID : 11170920
Informations de copyright
© 2021 Wiley Periodicals LLC.
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