Journal article
Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics
Ceramics international, Vol.43(14), pp.10999-11005
10/01/2017
DOI: 10.1016/j.ceramint.2017.05.141
PMCID: PMC5662116
PMID: 29097830
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 degrees C, dwell time 10 min), Speed (S, 1510 degrees C, dwell time 25 min), and Long-term (LT, 1510 degrees 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.
Details
- Title: Subtitle
- Speed sintering translucent zirconia for chairside one-visit dental restorations: Optical, mechanical, and wear characteristics
- Creators
- Marina R. Kaizer - New York UniversityPetra C. Gierthmuehlen - Heinrich Heine University DüsseldorfMateus B. F. dos Santos - Universidade Federal de PelotasSergio S. Cava - Universidade Federal de PelotasYu Zhang - New York University
- Resource Type
- Journal article
- Publication Details
- Ceramics international, Vol.43(14), pp.10999-11005
- DOI
- 10.1016/j.ceramint.2017.05.141
- PMID
- 29097830
- PMCID
- PMC5662116
- NLM abbreviation
- Ceram Int
- ISSN
- 0272-8842
- eISSN
- 1873-3956
- Publisher
- Elsevier
- Number of pages
- 7
- Grant note
- R01DE026772 / NATIONAL INSTITUTE OF DENTAL & CRANIOFACIAL RESEARCH; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Dental & Craniofacial Research (NIDCR) CMMI-0758530 / National Science Foundation; National Science Foundation (NSF) 2R01 DE017925; 1R01 DE026772 / United States National Institute of Dental and Craniofacial Research; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute of Dental & Craniofacial Research (NIDCR)
- Language
- English
- Date published
- 10/01/2017
- Academic Unit
- Prosthodontics
- Record Identifier
- 9984945919802771
Metrics
1 Record Views