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• W4309418535 abstract "Considering that the surface characteristics and microstructure are relevant factors that may affect the appearance and strength of a material, this study aims to analyse the differences regarding surface roughness and microhardness among layers of three types of dental zirconia: super-high translucent zirconia Ceramill Zolid fx ML (5Y-TZP), super-translucent zirconia STML (4Y-TZP), and IPS e.max ZirCAD CEREC/in Lab MT Multi (4Y + 5Y-TZP), also evaluating the influence of the surface treatment performed by glazing and polishing-before, respectively after aging-by thermocycling. Forty plate-shape specimens were sectioned from the ceramic blocks with a precision disc, polished and sintered according to the manufacturer’s instructions and then, equally divided - the surface of some was finished by polishing and the others by glazing; from each category was formed a control (polished/glazed) group and one subjected to termocycling (polished/glazed) − 30.0000 cycles in a 5˚C and a 55˚C bath with distilled water in a thermocycler, resulting four groups of ten samples, for a material. The assessment of surface roughness (Ra, Rz) was performed with a contact profilometer, with Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM); Vickers hardness (VH) values were recorded with a microhardness tester. The evaluations of the surfaces were achieved in each area: incisal, medium, cervical. For statistical analyses, paired sample t-Test, unpaired sample t-Test, two-way ANOVA test (α = 0.05), Pearson's correlations were used. Both before and after thermocycling, polishing and glazing, as surface treatment have a significant effect on roughness, respectively on microhardness; no statistical differences were observed among areas, on each polished or glazed surface. On the glazed samples, the values recorded for surface roughness were significant higher and for microhardness-lower, compared with those of the polished group. After thermocycling, microrougness increased for STML and all polished specimens and decreased on glazed surfaces of Ceramill Zolid fx ML and IPS e.max ZirCAD CEREC/in Lab MT Multi. Concerning microhardness, the thermocycling procedure had no significant influence. The super-high translucent material was less affected by aging than the super-high translucent zirconia." @default.
• W4309418535 created "2022-11-27" @default.
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• W4309418535 date "2022-11-01" @default.
• W4309418535 modified "2023-10-13" @default.
• W4309418535 title "Surface characteristics assessment among layers of different translucent multilayered dental zirconia related to aging" @default.
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• W4309418535 doi "https://doi.org/10.1016/j.matpr.2022.11.121" @default.
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