Document Detail


Micro-Raman spectroscopic analysis of the degree of conversion of composite resins containing different initiators cured by polywave or monowave LED units.
MedLine Citation:
PMID:  22094322     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: To determine the degree of conversion (DC) over 48h post-curing of resin mixtures containing trimethylbenzoyl-diphenylphosphine oxide (TPO) initiator cured by a polywave or a monowave LED light-curing unit (LCU). METHODS: In resin mixtures based on equal weight percent (wt%) of BisGMA and TEGDMA the following initiators were added: 0.2wt% camphorquinone (CQ)+0.8wt% ethyl-4-dimethylaminobenzoate (EDMAB) (Group 1); 1wt% TPO (Group 2) and 0.1wt% CQ+0.4wt% EDMAB+0.5wt% TPO (Group 3). Half of the samples in each group (n=5) were cured using a polywave (bluephase(®) G2, Ivoclar Vivadent) or a monowave LED LCU (bluephase(®), Ivoclar Vivadent). The DC was measured using micro-Raman spectroscopy within 5min and then 1, 3, 6, 24 and 48h post-irradiation. The data were analysed using general linear model and two-way ANOVA for the factors 'time', 'material', 'surface' and 'LCU' at α=0.05. RESULTS: The initial DC values obtained upon light curing remained similar over a 48h period. bluephase(®) G2 produced the highest DC in Group 2 followed by Group 3, and Group 1. bluephase(®) resulted in the highest DC in Group 1, followed by Group 2 and Group 3 (p<0.05). CONCLUSIONS: Unfilled resin materials containing both TPO- and CQ-amine initiators are effectively cured using bluephase(®) G2. Resin mixture with the same wt% of initiators is better cured when TPO is the only initiator, compared to CQ-amine only or combined TPO and CQ-amine system. After initial light cure, no additional conversion of uncured monomers was detected in an unfilled resin material over 48h at 37°C.
Authors:
Vesna Miletic; Ario Santini
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-6
Journal Detail:
Title:  Journal of dentistry     Volume:  -     ISSN:  1879-176X     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0354422     Medline TA:  J Dent     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier Ltd.
Affiliation:
University of Belgrade, School of Dentistry, Department of Restorative Odontology and Endodontics, Rankeova 4, Belgrade, Serbia.
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