Document Detail


Polymerization of orthodontic adhesives using modern high-intensity visible curing lights.
MedLine Citation:
PMID:  12970666     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study was undertaken to assess the efficacy of 3 visible curing lights: a conventional halogen light and 2 high-intensity halogen lights in the polymerization of a polymer-based and resin-modified glass ionomer orthodontic cement. Degree of polymerization was measured by Fourier transform infrared spectroscopy and the development of mechanical properties by Barcol hardness. The results were analyzed with either 2- or 3-way analysis of variance. It was shown that, for the polymer-based material, there was a significant increase in degree of cure and hardness with time of application of the light for each light source. For chemical conversion, there was no significant difference between the lights. However, there was a difference in hardness: the higher intensity lights produced greater hardness in shorter time. Thus, there was poor correlation between degree of polymerization and hardness. For the resin-modified glass ionomer, similar trends were found, but there was a difference in hardness between the top and the bottom of the specimens. It was concluded that the higher intensity lights could aid in the more rapid development of mechanical properties of the tested adhesives.
Authors:
Mark R Kauppi; Edward C Combe
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  124     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-09-12     Completed Date:  2003-10-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  316-22     Citation Subset:  D; IM    
Affiliation:
University of Minnesota School of Dentistry, 515 Delaware Street SE, Minneapolis, MN 55455, USA.
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MeSH Terms
Descriptor/Qualifier:
Acrylic Resins / radiation effects*
Aluminum Silicates / radiation effects*
Analysis of Variance
Dental Bonding*
Dental Equipment*
Halogens
Hardness
Light
Materials Testing
Orthodontic Appliances*
Polymers / chemistry,  radiation effects
Resin Cements* / metabolism*,  radiation effects*
Spectroscopy, Fourier Transform Infrared
Technology, Dental / instrumentation
Grant Support
ID/Acronym/Agency:
P30 DE 09737/DE/NIDCR NIH HHS
Chemical
Reg. No./Substance:
0/Acrylic Resins; 0/Aluminum Silicates; 0/Fuji Ortho LC; 0/Halogens; 0/Polymers; 0/Resin Cements; 0/Sondhi Indirect Bonding Resin; 0/Transbond XT

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


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