Document Detail

Second generation LEDs for the polymerization of oral biomaterials.
MedLine Citation:
PMID:  14698777     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: New blue, so called second generation light emitting diodes (LEDs) are now available with a high optical power output. These LEDs will potentially find widespread application in commercially available light curing units (LCUs). This study, therefore, investigated the curing performance of a prototype LCU containing one high power LED and a conventional halogen LCU (Polofil). METHODS: The performances of the LCUs were evaluated by measuring the Knoop hardness and depth of cure of the composites. Three dental composites were selected (Z100, Admira and Revolcin Flow) in a light (A2) and a dark shade (A3.5 or A4), respectively, and were polymerized for 40 s each. RESULTS: The LED prototype (irradiance=901 mW/cm2) achieved a statistically significantly greater (p<0.05) depth of cure than the halogen LCU (irradiance=860 mW/cm2) for all composites. Generally, there was no statistically significant difference in Knoop hardness on the top and bottom of a 2 mm thick disk for the composites Z100 and Admira if polymerized with the LED prototype or halogen LCU. The composite Revolcin Flow, however, showed in general a statistically significant lower Knoop hardness if polymerized with the LED LCU. SIGNIFICANCE: The present study shows that second generation LEDs have the potential to replace halogen LCUs if the composites are selected carefully. Furthermore, this study confirmed that the depth of cure test does not discriminate between LCU's performance for composites containing co-initiators, but the Knoop hardness test does.
Alexander Uhl; Bernd W Sigusch; Klaus D Jandt
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  20     ISSN:  0109-5641     ISO Abbreviation:  Dent Mater     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-12-30     Completed Date:  2004-03-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  80-7     Citation Subset:  D    
Institute of Materials Science and Technology (IMT), Friedrich-Schiller-University Jena, Löbdergraben 32, Jena D-07743, Germany.
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MeSH Terms
Analysis of Variance
Composite Resins / chemistry,  radiation effects*
Dental Equipment*
Electric Power Supplies
Hardness Tests
Methacrylates / chemistry,  radiation effects
Polymers / chemistry
Silicon Dioxide / chemistry,  radiation effects
Siloxanes / chemistry,  radiation effects
Technology, Dental / instrumentation
Zirconium / chemistry,  radiation effects
Reg. No./Substance:
0/Composite Resins; 0/Halogens; 0/Methacrylates; 0/Polymers; 0/Siloxanes; 0/Terpenes; 0/Z100 composite resin; 0/admira; 0/revolcin; 465-29-2/camphoroquinone; 7440-67-7/Zirconium; 7631-86-9/Silicon Dioxide

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