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Surface, Microstructural, and Mechanical Characterization of Prefabricated Pediatric Zirconia Crowns

1
Clinic of Orthodontics and Pediatric Dentistry, Centrer of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland
2
Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, 11527 Athens, Greece
3
In private practice, 8032 Zurich, Switzerland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3280; https://doi.org/10.3390/ma12203280
Received: 18 September 2019 / Revised: 30 September 2019 / Accepted: 5 October 2019 / Published: 9 October 2019
(This article belongs to the Section Biomaterials)
The purpose of this study was to characterize the surface roughness, the microstructure, and mechanical properties of four prefabricated zirconia pediatric crowns. Ten prefabricated crowns from four different manufacturers (Cheng Crowns Zirconia), (EZCrowns), (NuSmile ZR), and (Zirconia Pediatric Crowns) were included in this study. The surface roughness parameters (Sa, Sq, Sz, Sc, and Sv) of all samples were studied by optical profilometry and then the microstructure was studied by Raman spectroscopy. Then, all samples were embedded in epoxy resin and after metallographic polishing, the Martens hardness (HM), indentation modulus (EIT), elastic index (ηIT), Vickers hardness (HV), and fracture toughness (KIC) were identified by the Instrumented Indentation Testing (IIT). All data were statistically analyzed by a one-way ANOVA and a Tukey multiple comparison test at α = 0.05. Only the tetragonal phase of zirconia for all materials tested was identified after Raman analysis. However, statistically significant differences were found among the surface roughness parameters, HV and KIC, while no differences were allocated for HΜ, EIT, and ηΙΤ. Although the materials tested shared a similar microstructure, significant differences in surface roughness parameters HV and KIC were identified and, thus, differences in their clinical performance were anticipated. View Full-Text
Keywords: zirconia; pediatric crowns; Raman; surface roughness; mechanical properties zirconia; pediatric crowns; Raman; surface roughness; mechanical properties
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MDPI and ACS Style

Diener, V.; Polychronis, G.; Erb, J.; Zinelis, S.; Eliades, T. Surface, Microstructural, and Mechanical Characterization of Prefabricated Pediatric Zirconia Crowns. Materials 2019, 12, 3280.

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