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Fatigue strength of yttria-stabilized zirconia polycrystals: Effects of grinding, polishing, glazing, and heat treatment
- Source :
- Journal of the Mechanical Behavior of Biomedical Materials. 75:512-520
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- This study aimed to evaluate and compare the effect of different surface post-processing treatments (polishing, heat treatment, glazing, polishing + heat treatment and polishing + glazing) on the superficial characteristics (micromorphology and roughness), phase transformation and fatigue strength of a Y-TZP ceramic ground with diamond bur. Discs of Y-TZP ceramic were manufactured (ISO:6872-2015; final dimensions of 15mm in diameter and 1.2 ± 0.2mm in thickness) and randomly allocated according to the surface condition: Ctrl - as-sintered; Gr - ground with coarse diamond bur; Gr+HT - ground and subjected to the heat treatment; Gr+Pol - ground and polished; Gr+Pol+HT - ground, polished and heat treated; Gr+Gl - ground and glazed; Gr+Pol+Gl - ground, polished and glazed. The following analyses were performed: roughness (n = 25), surface topography (n = 2), phase transformation (n = 2) and fatigue strength by staircase method (n = 20). All treatments influenced to some extent the surface characteristics of Y-TZP, being that polishing reduced the surface roughness, the m-phase content and improved the fatigue strength; glazing led to the lowest roughness values (Ra and Rz), although it showed the worst fatigue strength; heat treatment showed limited effect on surface roughness, led to complete reversion of the existing m-phase content to t-phase, without enhancing fatigue performance. Thus, a polishing protocol after clinic adjustment (grinding) of monolithic restorations based on polycrystalline zirconia material is mandatory for surface characteristics and fatigue performance improvements.
- Subjects :
- Hot Temperature
Materials science
Surface Properties
Biomedical Engineering
Polishing
02 engineering and technology
Surface finish
Biomaterials
03 medical and health sciences
0302 clinical medicine
Materials Testing
Surface roughness
Yttrium
Cubic zirconia
Ceramic
Yttria-stabilized zirconia
Metallurgy
030206 dentistry
021001 nanoscience & nanotechnology
Dental Porcelain
Fatigue limit
Dental Polishing
Glazing
Mechanics of Materials
visual_art
visual_art.visual_art_medium
Zirconium
Diamond
0210 nano-technology
Subjects
Details
- ISSN :
- 17516161
- Volume :
- 75
- Database :
- OpenAIRE
- Journal :
- Journal of the Mechanical Behavior of Biomedical Materials
- Accession number :
- edsair.doi.dedup.....4212e349b112c39f2f36586a523accd7