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Effect of low-temperature degradation on the mechanical and microstructural properties of tooth-colored 3Y-TZP ceramics
University of Gothenburg.
Tohoku University Graduate School of Dentistry.
Japan Fine Ceramics Co..
Japan Fine Ceramics Co..
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2016 (English)In: Journal of The Mechanical Behavior of Biomedical Materials, ISSN 1751-6161, E-ISSN 1878-0180, Vol. 53, 301-311 p.Article in journal (Refereed) Published
Abstract [en]

The aim of the present study was to evaluate the effects of low-temperature degradation (LTD) induced by autoclaving on the mechanical and microstructural properties of tooth-colored 3mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP). In total, 162 disc-shaped 3Y-TZP specimens were prepared. Two-thirds of the specimens were shaded by either the infiltration or powder mixing methods while the remaining specimens were used without coloring. The specimens were autoclaved at 134°C for 0, 10, and 100h to induce LTD (n=18 for each group). Chemical compositions were analyzed with X-ray fluorescence spectroscopy. Biaxial flexural strength was measured using a piston-on-three-ball test. The surface fraction and penetration depth of the monoclinic phase were examined using X-ray diffraction and scanning electron microscopy, respectively. The tooth-colored 3Y-TZP specimens contained Fe2O3 and Er2O3 (infiltration technique), and Fe2O3 (powder mixing method) at concentrations of<0.5wt%. The tooth-colored 3Y-TZP had higher strength than the non-colored material after 100h of autoclaving. In terms of surface fraction and penetration depth, the generation of monoclinic phase was significantly lower in the tooth-colored 3Y-TZP than in the non-colored material. The tooth-colored 3Y-TZP possessed equivalent biaxial flexural strength to that of the non-colored material and higher resistance to LTD regardless of the coloring technique (infiltration technique or powder mixing method) when the coloring pigments were contained at concentrations used in the present study. © 2015 Elsevier Ltd.

Place, publisher, year, edition, pages
Elsevier Ltd , 2016. Vol. 53, 301-311 p.
Keyword [en]
Coloring, Low-temperature degradation, Phase transformation, Weibull analysis, Zirconia
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13294DOI: 10.1016/j.jmbbm.2015.08.031Scopus ID: 2-s2.0-84941775335OAI: oai:DiVA.org:ri-13294DiVA: diva2:973500
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-08-09Bibliographically approved

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