Document Detail

Contraction stresses in dental composites adjacent to and at the bonded interface as measured by crack analysis.
MedLine Citation:
PMID:  20691287     Owner:  NLM     Status:  In-Process    
The objective of this study was to calculate stresses produced by polymerization contraction in regions surrounding a dental resin composite restoration. Initial cracks were made with a Vickers indenter at various distances from the edge of a cylindrical hole in a soda-lime glass disk. Indentation crack lengths were measured parallel to tangents to the hole edge. Resin composites (three brands) were placed in the hole and polymerized (two light irradiation protocols) at equal radiation exposures. The crack lengths were re-measured at 2 and 10 min after irradiation. Radial tensile stresses due to polymerization contraction at the location of the cracks (σ(crack)) were calculated from the incremental crack lengths and the fracture toughness K(c) of the glass. Contraction stresses at the composite-glass bonded interface (σ(interface)) were calculated from σ(crack) on the basis of the simple mechanics of an internally pressurized thick-walled cylinder. The greater the distance or the shorter the time following polymerization, the smaller was σ(crack). Distance, material, irradiation protocol and time significantly affected σ(crack). Two-step irradiation resulted in a significant reduction in the magnitude of σ(interface) for all resin composites. The contraction stress in soda-lime glass propagated indentation cracks at various distances from the cavity, enabling calculation of the contraction stresses.
Takatsugu Yamamoto; Akihito Nishide; Michael V Swain; Jack L Ferracane; Ronald L Sakaguchi; Yasuko Momoi
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Publication Detail:
Type:  Journal Article     Date:  2010-08-04
Journal Detail:
Title:  Acta biomaterialia     Volume:  7     ISSN:  1878-7568     ISO Abbreviation:  Acta Biomater     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-11-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101233144     Medline TA:  Acta Biomater     Country:  England    
Other Details:
Languages:  eng     Pagination:  417-23     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Department of Operative Dentistry, Tsurumi University School of Dental Medicine, Tsurumi-ku, Yokohama, Kanagawa, Japan.
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