-
Tytuł:
-
Aging resistant ZTA composite for dental applications: Microstructural, optical and mechanical characterization.
-
Autorzy:
-
Benalcazar Jalkh EB; Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil; Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA. Electronic address: .
Monteiro KN; Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil.
Cesar PF; Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil.
Genova LA; Institute of Research in Nuclear Energy, SP, Brazil.
Bergamo ETP; Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil.
Lopes ACO; Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil.
Lima E; Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil.
Lisboa-Filho PN; Department of Physics, São Paulo State University, Bauru, SP, Brazil.
Campos TMB; Technological Institute of Aeronautics, São José dos Campos, SP, Brazil.
Witek L; Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Biomedical Engineering, New York University, Tandon School of Engineering, Brooklyn, NY, USA.
Coelho PG; Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Hansjörg Wyss Department of Plastic Surgery, NYU Langone Medical Center, New York, NY, USA; Mechanical and Aerospace Engineering, NYU Tandon School of Engineering, New York, NY, USA.
Borges AFS; Department of Operative Dentistry, Endodontics and Dental Materials, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil.
Bonfante EA; Department of Prosthodontics and Periodontology, University of São Paulo, Bauru School of Dentistry, Bauru, SP, Brazil.
-
Źródło:
-
Dental materials : official publication of the Academy of Dental Materials [Dent Mater] 2020 Sep; Vol. 36 (9), pp. 1190-1200. Date of Electronic Publication: 2020 Jun 17.
-
Typ publikacji:
-
Journal Article; Research Support, Non-U.S. Gov't
-
Język:
-
English
-
Imprint Name(s):
-
Publication: 1998- : Kidlington, Oxford, UK : Elsevier Science
Original Publication: Copenhagen : Munksgaard, c1985-
-
MeSH Terms:
-
Aluminum Oxide*
Zirconium*
Ceramics ; Dental Materials ; Materials Testing ; Surface Properties ; Yttrium
-
Contributed Indexing:
-
Keywords: Composites; Mechanical properties; Microstructure; Optical properties; ZrO(2)–Al(2)O(3)
-
Substance Nomenclature:
-
0 (Dental Materials)
58784XQC3Y (Yttrium)
C6V6S92N3C (Zirconium)
LMI26O6933 (Aluminum Oxide)
S38N85C5G0 (zirconium oxide)
-
Entry Date(s):
-
Date Created: 20200621 Date Completed: 20201204 Latest Revision: 20201214
-
Update Code:
-
20240105
-
DOI:
-
10.1016/j.dental.2020.05.011
-
PMID:
-
32561117
-
Objective: To synthesize a zirconia toughened alumina (ZTA) composite with 70% alumina reinforced by 30% zirconia for dental applications and to characterize its microstructure and optical properties for comparison with the isolated counterpart materials and a first-generation 3Y-TZP.
Methods: Disc-shaped specimens were divided in four groups (n = 70/material): (1) 3YSB-E (first generation 3Y-TZP), (2) Zpex (second generation 3Y-TZP), (3) alumina, and (4) ZTA-Zpex 70/30. After synthesis, ceramic powders were pressed, and green-body samples sintered following a predetermined protocol. Specimens were polished to obtain a mirror surface finish. Apparent density was measured by Archimedes principle. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the crystalline content and microstructure. Reflectance tests were performed to determine the contrast-ratio (CR) and translucency-parameter (TP). Mechanical properties were assessed by biaxial flexural strength (BFS) test. All analyses were conducted before and after artificial aging (20 h, 134 °C, 2.2 bar). Optical parameters were evaluated through repeated-measures analysis of variance and Tukey tests (p < 0.05). BFS data were analyzed using Weibull statistics (95% CI).
Results: High density values (95-99%) were found for all ceramic materials and SEM images exhibited a dense microstructure. While XRD patterns revealed the preservation of crystalline content in the ZTA composite, an increase in the monoclinic peak was observed for pure zirconias after aging. Significantly higher CR and lower TP values were observed for the ZTA composite, followed by alumina, 3YSB-E, and Zpex. The highest characteristic stress was recorded for 3YSB-E, followed by intermediate values between ZTA and Zpex, and the lowest for alumina. Aging affected the optical and mechanical properties of both zirconias, while remained stable for ZTA composite and alumina.
Significance: The synthesis of experimental 70-30% ZTA composite was successful and its relevance for dental applications relies on its higher masking ability, aging resistance, and strength similar to zirconia.
(Copyright © 2020 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.)
