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Tytuł:
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Flexural strength and Weibull characteristics of stereolithography additive manufactured versus milled zirconia.
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Autorzy:
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Revilla-León M; Assistant Professor and Assistant Program Director AEGD Residency, College of Dentistry, Texas A&M University, Dallas, Texas; Affiliate Faculty Graduate Prosthodontics University of Washington, Seattle, Wash; Researcher at Revilla Research Center, Madrid, Spain. Electronic address: .
Al-Haj Husain N; Specialization Candidate, Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
Ceballos L; Associate Professor, Area of Stomatology, Rey Juan Carlos University, Madrid, Spain.
Özcan M; Professor and Head, Dental Materials Unit, Center for Dental and Oral Medicine, University of Zürich, Zurich, Switzerland.
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Źródło:
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The Journal of prosthetic dentistry [J Prosthet Dent] 2021 Apr; Vol. 125 (4), pp. 685-690. Date of Electronic Publication: 2020 May 17.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: St. Louis Mo : Mosby-Year Book
Original Publication: St. Louis, Mosby.
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MeSH Terms:
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Flexural Strength*
Stereolithography*
Aged ; Humans ; Materials Testing ; Zirconium
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Substance Nomenclature:
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C6V6S92N3C (Zirconium)
S38N85C5G0 (zirconium oxide)
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Entry Date(s):
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Date Created: 20200522 Date Completed: 20210407 Latest Revision: 20210407
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Update Code:
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20240105
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DOI:
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10.1016/j.prosdent.2020.01.019
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PMID:
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32434662
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Statement of Problem: Zirconia restorations can be processed by using stereolithography additive manufacturing (AM) technologies. However, whether additive manufactured zirconia could achieve flexural strength values comparable with those of milled zirconia is unclear.
Purpose: The purpose of this in vitro study was to compare the flexural strength and Weibull characteristics of milled and additive manufactured zirconia.
Material and Methods: A total of 40 zirconia bars (25×4×1.2 mm) were obtained by using 2 manufacturing procedures, subtractive (CNC group) (IPS e.max ZirCAD; Ivoclar Vivadent AG) and additive manufacturing (AM group) (3DMix ZrO 2 ; 3DCeram) technologies and assigned to 2 subgroups according to accelerating artificial aging procedures (mastication simulation): nonaged and aged (n=10). Flexural strength was measured in all specimens by using 3-point bend tests according to ISO/CD 6872.2 with a universal testing machine (Instron Model 8501; Instron Corp). Two-parameter Weibull distribution values, including the Weibull modulus, scale (m), and shape (0) were calculated. Flexural strength values were analyzed by using 2-way ANOVA and Student t statistical tests (α=.05).
Results: The manufacturing procedure (P<.001), the mastication simulating aging procedure (P<.001), and the interaction between them (P<.001) significantly affected flexural strength values. The CNC group exhibited statistically higher flexural strength values than those in the AM group when the specimens were tested before performing an aging procedure (P<.001) and after mastication simulation (P<.001). Moreover, mastication simulation produced a significant reduction in flexural strength for both the CNC group (P<.039) and the AM group (P<.001).
Conclusions: The manufacturing process reported a significant effect on the flexural strength of the zirconia material tested. Mastication simulation as a means of accelerating artificial aging resulted in the significantly decreased flexural strength values of milled and additively manufactured zirconia material, with the Weibull moduli being significantly higher for the milled groups versus the milled specimens.
(Copyright © 2020 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.)
