| Damage modes in dental layer structures. | |
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MedLine Citation:
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PMID: 10326733 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Natural teeth (enamel/dentin) and most restorations are essentially layered structures. This study examines the hypothesis that coating thickness and coating/substrate mismatch are key factors in the determination of contact-induced damage in clinically relevant bilayer composites. Accordingly, we study crack patterns in two model "coating/substrate" bilayer systems conceived to simulate crown and tooth structures, at opposite extremes of elastic/plastic mismatch: porcelain on glass-infiltrated alumina ("soft/hard"); and glass-ceramic on resin composite ("hard/soft"). Hertzian contacts are used to investigate the evolution of fracture damage in the coating layers, as functions of contact load and coating thickness. The crack patterns differ radically in the two bilayer systems: In the porcelain coatings, cone cracks initiate at the coating top surface; in the glass-ceramic coatings, cone cracks again initiate at the top surface, but additional, upward-extending transverse cracks initiate at the internal coating/substrate interface, with the latter dominant. The substrate is thereby shown to have a profound influence on the damage evolution to ultimate failure in the bilayer systems. However, the cracks are highly stabilized in both systems, with wide ranges between the loads to initiate first cracking and to cause final failure, implying damage-tolerant structures. Finite element modeling is used to evaluate the tensile stresses responsible for the different crack types. The clinical relevance of these observations is considered. |
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Authors:
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Y G Jung; S Wuttiphan; I M Peterson; B R Lawn |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of dental research Volume: 78 ISSN: 0022-0345 ISO Abbreviation: J. Dent. Res. Publication Date: 1999 Apr |
Date Detail:
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Created Date: 1999-05-26 Completed Date: 1999-05-26 Revised Date: 2009-08-27 |
Medline Journal Info:
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Nlm Unique ID: 0354343 Medline TA: J Dent Res Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 887-97 Citation Subset: D; IM |
Affiliation:
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Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aluminum Oxide
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chemistry Aluminum Silicates / chemistry Coated Materials, Biocompatible / chemistry* Composite Resins / chemistry Crowns Dental Materials / chemistry* Dental Porcelain / chemistry Dental Restoration Failure* Dental Stress Analysis Finite Element Analysis Humans Materials Testing / methods, statistics & numerical data Mechanics Models, Structural* Potassium Compounds / chemistry |
| Grant Support | |
ID/Acronym/Agency:
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P01 DE10976/DE/NIDCR NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Aluminum Silicates; 0/Charisma composite resin; 0/Coated Materials, Biocompatible; 0/Composite Resins; 0/Dental Materials; 0/Dicor ceramic; 0/Potassium Compounds; 12001-21-7/Dental Porcelain; 12168-80-8/feldspar; 133404-69-0/In-Ceram; 1344-28-1/Aluminum Oxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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