Microstructural features, physicο-mechanical properties, and wear behavior of dental translucent polychromic multilayer zirconia of hybrid composition prepared by milling technology.

Autor: Dimitriadis K; Division of Dental Technology, Department of Biomedical Sciences, University of West Attica, Athens, Greece., Constantinou M; Department of Mechanical and Materials Science Engineering, Cyprus University of Technology, Limassol, Cyprus., Moschovas D; Department of Materials Science and Engineering, School of Engineering, University of Ioannina, Ioannina, Greece., Constantinides G; Department of Mechanical and Materials Science Engineering, Cyprus University of Technology, Limassol, Cyprus., Agathopoulos S; Department of Materials Science and Engineering, School of Engineering, University of Ioannina, Ioannina, Greece.
Jazyk: angličtina
Zdroj: Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] [J Esthet Restor Dent] 2023 Oct; Vol. 35 (7), pp. 1121-1130. Date of Electronic Publication: 2023 Apr 19.
DOI: 10.1111/jerd.13047
Abstrakt: Objective: The present study determined the mechanical properties and the wear behavior, as results of the micro(nano)structure, of the enamel, transition, and dentine layers, which comprise the polychromic multilayer zirconia materials of hybrid composition fabricated by milling technology.
Materials and Methods: Prismatic blocks were fabricated from two commercial pre-sintered dental polychromic multilayer zirconia materials of hybrid composition, IPS e.max ZirCAD Prime (medium and high translucency, from the dentine to the incisal layer) and 3D Pro ML (translucency gradient, from the dentine to the incisal layer) by milling technique, and then, cut into 3 distinct parts to separate the enamel, transition, and dentine layers. The samples were sintered, thermally treated (similarly to the glazing procedure), and polished for characterization. Their microstructure, mechanical properties (determined by nanoindentation and microhardness), and wear behavior (evaluated by scratch test), were examined.
Results: The produced materials had a homogeneous and dense nanostructure, where the grain size decreased from the enamel to dentine layer. The mechanical properties decreased from the dentine to enamel layer. However, the three layers manifested similar dynamic friction coefficient.
Conclusion: The differences in the above properties in the three layers negligibly influenced the wear behavior of the entire multilayer zirconia material.
Clinical Significance: The properties of dental restorations produced from polychromic multilayer zirconia of hybrid composition by milling technology (i.e., strong, non-fragile, and esthetic materials), anticipate good performance in oral cavity.
(© 2023 Wiley Periodicals LLC.)
Databáze: MEDLINE
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