Water as Veneering Modeling Liquid Affects Microhardness of Glassy Matrix Veneering Ceramic.

Autor:	Amaral M; Department of Dentistry, University of Taubaté, Rua dos Operários, n9, 12020-340, Taubaté, Brazil., Campos TMB; Technological Institute of Aeronautics, Physics Department, Praça Marechal Eduardo Gomes, 50, 12228-900, São José dos Campos, Brazil., Takahashi T; Department of Dentistry, University of Taubaté, Rua dos Operários, n9, 12020-340, Taubaté, Brazil., Moura GSD; Department of Dentistry, University of Taubaté, Rua dos Operários, n9, 12020-340, Taubaté, Brazil., Ramos GF; Department of Dental Materials and Prosthesis, São Paulo State University, Av. Eng. Francisco José Longo, 777, 12245-000, São José dos Campos, Brazil., Melo RMD; Department of Dental Materials and Prosthesis, São Paulo State University, Av. Eng. Francisco José Longo, 777, 12245-000, São José dos Campos, Brazil., Özcan M; Division of Dental Biomaterials, Center for Dental and Oral Medicine, University of Zürich, Plattenstrasse 11, 8032 Zürich, Switzerland.
Jazyk:	angličtina
Zdroj:	The European journal of prosthodontics and restorative dentistry [Eur J Prosthodont Restor Dent] 2022 Nov 30; Vol. 30 (4), pp. 262-266. Date of Electronic Publication: 2022 Nov 30.
DOI:	10.1922/EJPRD_2372Amaral05
Abstrakt:	Purpose/aim: To evaluate the effect of different veneering liquids used for modeling on microhardness, fracture toughness and biaxial flexural strength of a glass-veneering ceramic. Material and Methods: The manufacturer recommended modeling liquid (ML), distilled water (DW), isopropyl alcohol (IA), 0.5% (P05), 1% (P1), and 2% (P2) polyethylene glycol solutions were mixed with feldspathic ceramic powder to form disc-shaped samples (n=20, 15 mm × 1.2 mm). After sintering, samples were mirror-polished and subjected to Vickers indentation (n=5) for measurement of microhardness and fracture toughness. The remaining 15 samples from each group were subjected to biaxial flexural strength. Data were subjected to one-way ANOVA and Weibull analysis. Results: The microhardness was affected by veneering liquid (p=0.002): DW promoted higher microhardness values than ML and IA. Fracture toughness (p=0.301) and flexural strength (p=0.930) were not affected by the veneering liquid but Weibull parameters were affected. All groups presented surface pores under high magnification. Conclusion: Even though the use of DW led to higher values of surface microhardness than the ML, all obtained values are inside the range of enamel microhardness values reported in the literature. Such parameters may affect antagonist wear and should be reported in clinical trials. (Copyright© 2022 Dennis Barber Ltd.)
Databáze:	MEDLINE
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