Influence of the background, substrate and thickness in light behaviour and colour of zirconia-reinforced lithium silicate (ZLS) glass-ceramic

Objective: To evaluate the influence of background, substrates and thickness on the color and light behaviour of two ZLS glass ceramics. Material and Methods: Standardized disc-shape specimens (12 x 1.2 mm), color A1 HT, of Celtra Duo and Vita Suprinity (n=30), were tested over a white/black backgro...

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Bibliographic Details
Authors: Dos Santos, Ana Rita Canhão Rebelo, Riquieri, Hilton [UNESP], Saavedra, Guilherme de Siqueira Ferreira Anzaloni [UNESP], Viegas, Diogo Miguel da Costa Cabecinha Pacheco, Palmela, Adriana Sofia Neto da Silva, Hermínio, Joana Raquel Lima, Roque, João Carlos da Silva
Format: article
Status:Published version
Publication Date:2021
Country:Brasil
Institution:Universidade Estadual Paulista (UNESP)
Repository:Repositório Institucional da UNESP
Language:English
OAI Identifier:oai:repositorio.unesp.br:11449/223569
Online Access:http://dx.doi.org/10.4322/BDS.2021.E2929
http://hdl.handle.net/11449/223569
Access Level:Open access
Keyword:Ceramic
Color
Dental Materials
Lithium Disilicate
Zirconia
Description
Summary:Objective: To evaluate the influence of background, substrates and thickness on the color and light behaviour of two ZLS glass ceramics. Material and Methods: Standardized disc-shape specimens (12 x 1.2 mm), color A1 HT, of Celtra Duo and Vita Suprinity (n=30), were tested over a white/black background, and divided in five groups (n=6) to be tested over five substrates (polished gold alloy, white zirconia and composite, dentine and enamel A1 colour). The L*, C*, h*, a*, b* and ΔE values, were recorded in two thicknesses (1.2 and 2.4 mm). Translucency parameter (TP), contrast ratio (CR) and opalescence parameter (OP) were calculated. Data was analysed with non-parametric tests: Mann Whitney between ceramic materials for thickness, Wilcoxon for thicknesses in substrates and ceramic material and Kruskal-Wallis with Bonferroni corrections tests (p<0,01) for substrates. Results: For 2.4 mm, the ΔE values were always higher independently of ceramic material or substrates. Vita Suprinity registered lower values than Celtra Duo. Zirconia substrate registered the lower values. For 1.2 mm, dentine registered the lower values. Gold alloy and composite substrates registered the lower ΔE values for 1.2 mm Celtra Duo and 2.4 mm Vita Suprinity specimens. CT and OP higher values and TP lower values were registered for 2.4 mm Vita Suprinity. It was impossible to calculate for Celtra Duo specimens. Conclusions: Background, substrate and thickness had significant influence in light behaviour and final color of ZLS glass ceramics. Substrates Gold alloy and dentine exhibited clinical acceptable ΔE values for 1.2 mm Celtra Duo specimens.

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