Document Detail

Effect of light-cure time of adhesive resin on the thickness of the oxygen-inhibited layer and the microtensile bond strength to dentin.
MedLine Citation:
PMID:  16333849     Owner:  NLM     Status:  MEDLINE    
A thick oxygen-inhibited layer (OIL) on a cured adhesive layer (AL) is believed to result in both good adaptation of composite resin (CR) and high bond strength. A high degree of conversion (DC) of the AL is also needed for durable bonding. This study evaluated the hypothesis that increasing the DC by prolonging the light-curing time of adhesive bonding resin might decrease the bond strength of the adhesive to dentin because of the subsequent thinning of the OIL thickness. The OIL thickness and the DC of solvent-removed One Step and D/E bonding resin of All Bond 2 (Bisco, USA) were measured simultaneously with FT-NIR spectroscopy according to increasing light-cure times (10, 20, 30, and 60 s) so as to evaluate their effect on the microtensile bond strength. The bonded interfaces were evaluated using scanning electron microscopy. Excessive irradiation of light-curing adhesives increased the DC, but decreased the OIL thickness. When the OIL was significantly thin by curing the adhesives for 30 or 60 s, defects were observed at the interface between the AL and the CR, as well as at the interface between the AL and the hybrid layer. When the OIL was thick, free radicals from the overlying CR may have diffused into the unreacted monomer mixtures of the OIL, chemically connecting the cured AL and the newly curing composite. It was found that to obtain maximum dentin bond strength, light-curing adhesives should be cured for the irradiation time recommended by the manufacturer.
Jong-Soon Kim; Yong-Hoon Choi; Byeong-Hoon Cho; Ho-Hyun Son; In-Bog Lee; Chung-Moon Um; Chang-Keun Kim
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Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of biomedical materials research. Part B, Applied biomaterials     Volume:  78     ISSN:  1552-4973     ISO Abbreviation:  J. Biomed. Mater. Res. Part B Appl. Biomater.     Publication Date:  2006 Jul 
Date Detail:
Created Date:  2006-06-08     Completed Date:  2007-11-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101234238     Medline TA:  J Biomed Mater Res B Appl Biomater     Country:  United States    
Other Details:
Languages:  eng     Pagination:  115-23     Citation Subset:  IM    
Department of Conservative Dentistry, College of Dentistry, Seoul National University, Seoul, Korea.
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MeSH Terms
Dentin-Bonding Agents / chemistry*
Oxygen / antagonists & inhibitors*
Spectroscopy, Fourier Transform Infrared
Spectroscopy, Near-Infrared
Tensile Strength
Reg. No./Substance:
0/Dentin-Bonding Agents; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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