Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical,mechanical, and wear characteristics |
| |
| Affiliation: | 1. Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY 10010, USA;2. Graduate Program in Materials Science and Engineering, Federal University of Pelotas, Pelotas, Brazil;3. Department of Prosthodontics, University Medical Center Duesseldorf, Moorenstrasse 5, 40225 Duesseldorf, Germany;4. Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil;1. Department of Chemical Engineering, Federal University of Santa Catarina (UFSC), Brazil;2. Department of Metallurgical and Materials Engineering, University of São Paulo (USP), Brazil;3. Department of Chemical Engineering and Materials Science, University of California at Davis (UC-Davis), USA;1. Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, SP 17012-901, Brazil;2. Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Alameda Octávio Pinheiro Brisolla 7-35, Bauru, SP 17012-901, Brazil;3. Post-Graduation Program in Clinical Dentistry, Dental School, Positivo University, 5300 Pedro Viriato Parigot de Souza Rd., Curitiba, PR 81280-330, Brazil;4. Department of Biomedical Materials Science, University of Mississippi Medical Center,2500 North State Street, Jackson, MS 39216-4505, USA;1. Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Germany;2. Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Egypt;1. KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, Belgium;2. KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven & Dentistry, University Hospitals Leuven, Belgium;3. Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo 113-8510, Japan;4. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;1. KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven) & Dentistry, University Hospitals Leuven, Kapucijnenvoer 7, blok a bus 7001, B-3000 Leuven, Belgium;2. Department of Metallurgy and Materials Engineering (MTM), KU Leuven (University of Leuven), Kasteelpark Arenberg 44, B-3001 Heverlee (Leuven), Belgium;3. Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo 113-8549, Japan |
| |
| Abstract: | The fabrication of zirconia dental restorations is a time-consuming process due to traditional slow sintering schemes; zirconia (Y-TZP) produced by these conventional routes are predominantly opaque. Novel speed sintering protocols have been developed to meet the demand for time and cost effective chairside CAD/CAM-produced restorations, as well as to control ceramic microstructures for better translucency. Although the speed sintering protocols have already been used to densify dental Y-TZP, the wear properties of these restorations remain elusive. Fast heating and cooling rates, as well as shorter sintering dwell times are known to affect the microstructure and properties of zirconia. Thus, we hypothesize that speed sintered zirconia dental restorations possess distinct wear and physical characteristics relative to their conventionally sintered counterparts. Glazed monolithic molar crowns of translucent Y-TZP (inCoris TZI, Sirona) were fabricated using three distinct sintering profiles: Super-speed (SS, 1580 °C, dwell time 10 min), Speed (S, 1510 °C, dwell time 25 min), and Long-term (LT, 1510 °C, dwell time 120 min). Microstructural, optical and wear properties were investigated. Crowns that were super-speed sintered possessed higher translucency. Areas of mild and severe wear were observed on the zirconia surface in all groups. Micropits in the wear crater were less frequent for the LT group. Groups S and SS exhibited more surface pits, which caused a scratched steatite surface that is associated with a greater volume loss. Tetragonal to monoclinic phase transformation, resulting from the sliding wear process, was present in all three groups. Although all test groups had withstood thermo-mechanical challenges, the presence of hairline cracks emanating from the occlusal wear facets and extending deep into the restoration indicates their susceptibility to fatigue sliding contact fracture. |
| |
| Keywords: | Y-TZP Monolithic zirconia Speed sintering Translucency Mechanical properties Wear resistance |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
