Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding
| Autor: | Laiza Maria Grassi Fais, Lucas Miguel Candido, Daniel Patrick Obelenis Ryan, Gabriel Rodrigues Hatanaka, Lígia Antunes Pereira Pinelli, Selma Gutierrez Antonio |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Surface Properties Annealing (metallurgy) Wet grinding 02 engineering and technology 03 medical and health sciences Tetragonal crystal system 0302 clinical medicine X-Ray Diffraction Materials Testing Regeneration Yttrium Cubic zirconia Ceramic General Dentistry 030206 dentistry 021001 nanoscience & nanotechnology Microstructure Dental Porcelain Grinding Crystallography visual_art Ceramics and Composites visual_art.visual_art_medium Zirconium 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Dental Materials Journal. 36:447-453 |
| ISSN: | 1881-1361 0287-4547 |
| Popis: | This study evaluated microstructural and crystallographic phase changes after grinding (G) and regeneration firing/anneling (R) of Y-TZP ceramics. Thirty five bars (LavaTM and Ice Zirkon) were divided: Y-TZP pre-sintered, control (C), regeneration firing (R), dry grinding (DG), dry grinding+regeneration firing (DGR), wet grinding (WG) and wet grinding+regeneration firing (WGR). Grinding was conducted using a diamond bur and annealing at 1,000°C. The microstructure was analyzed by SEM and the crystalline phases by X-ray diffraction (XRD). XRD showed that pre-sintered specimens contained tetragonal and monoclinic phases, while groups C and R showed tetragonal, cubic and monoclinic phases. After grinding, the cubic phase was eliminated in all groups. Annealing (DGR and WGR) resulted in only tetragonal phase. SEM showed semi-circular cracks after grinding and homogenization of particles after annealing. After grinding, surfaces show tetragonal and monoclinic phases and R can be assumed to be necessary prior to porcelain layering when grinding is performed. |
| Databáze: | OpenAIRE |
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