Abstract | OBJECTIVES:
Leucite glass-ceramics used to produce all-ceramic restorations can suffer from brittle fracture and wear the opposing teeth. High strength and fine crystal sized leucite glass-ceramics have recently been reported. The objective of this study is to investigate whether fine and nano-scale leucite glass-ceramics with minimal matrix microcracking are associated with a reduction in in vitro tooth wear. METHODS: Human molar cusps (n=12) were wear tested using a Bionix-858 testing machine (300,000 simulated masticatory cycles) against experimental fine crystal sized (FS), nano-scale crystal sized (NS) leucite glass-ceramics and a commercial leucite glass-ceramic ( Ceramco-3, Dentsply, USA). Wear was imaged using Secondary Electron Imaging (SEI) and quantified using white-light profilometry. RESULTS: Both experimental groups were found to produce significantly (p<0.05) less volume and mean-height tooth loss compared to Ceramco-3. The NS group had significantly (p<0.05) less tooth mean-height loss and less combined (tooth and ceramic) loss than the FS group. Increased waviness and damage was observed on the wear surfaces of the Ceramco-3 glass-ceramic disc/tooth group in comparison to the experimental groups. This was also indicated by higher surface roughness values for the Ceramco-3 glass-ceramic disc/tooth group. CONCLUSIONS: Fine and nano-sized leucite glass-ceramics produced a reduction in in vitro tooth wear. The high strength low wear materials of this study may help address the many problems associated with tooth enamel wear and restoration failure.
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Authors | Antonios Theocharopoulos, Xiaohui Chen, Robert Hill, Michael J Cattell |
Journal | Journal of dentistry
(J Dent)
Vol. 41
Issue 6
Pg. 561-8
(Jun 2013)
ISSN: 1879-176X [Electronic] England |
PMID | 23438418
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2013 Elsevier Ltd. All rights reserved. |
Chemical References |
- Aluminum Silicates
- Dental Porcelain
- leucite
- Glass ceramics
- Ceramco
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Topics |
- Aluminum Silicates
(chemistry)
- Bite Force
- Ceramics
(chemistry)
- Crystallography
- Dental Enamel
(pathology)
- Dental Porcelain
(chemistry)
- Dental Stress Analysis
(instrumentation)
- Humans
- Image Processing, Computer-Assisted
- Mastication
(physiology)
- Materials Testing
- Microscopy, Electron, Scanning
- Nanoparticles
(chemistry)
- Surface Properties
- Tooth Crown
(pathology)
- Tooth Wear
(prevention & control)
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