| Effect of distance on irradiance and beam homogeneity from 4 light-emitting diode curing units. | |
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MedLine Citation:
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PMID: 21507291 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Purpose: To quantify the effect of distance on the irradiance and beam homogeneity from 4 curing lights. Methods: Four light-emitting diode curing lights were evaluated: Fusion, Bluephase 16i, Demi and FlashLite Magna. The irradiance at the centre of the light beam (ICB) was measured at 1.0 to 9.0 mm from the emitting tip using a 3.9-mm diameter probe connected to a spectrometer. The uniformity of the beam from each curing light was characterized by means of the "top hat factor" at 2.0, 4.0, 6.0 and 8.0 mm from the emitting tip. The useful beam diameter, within which irradiance values were greater than 400 mW/cm2, was calculated. The ICB, top hat factor and useful beam diameter were compared by analysis of variance and Fisher's protected least significant difference test at α = 0.01. Results: At all distances, the ICB was lowest for the FlashLite Magna and highest for the Fusion. Only the Fusion maintained an ICB above 1000 mW/cm2 at the 8.0 mm distance. For distances between 2.0 and 8.0 mm, the top hat factors were similar for the Fusion and the Demi, lower for the Bluephase 16i and lowest for the FlashLite Magna. Conclusions: Beam homogeneity, top hat factors and ICB varied significantly among the curing lights. These results indicate that deep restorations may not be adequately cured if the curing time is based on data obtained when the curing light is positioned close to the radiometer or resin. In addition, a single irradiance value cannot be used to describe the light output from a curing light. |
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Authors:
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Richard B Price; Daniel Labrie; J Marc Whalen; Christopher M Felix |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal (Canadian Dental Association) Volume: 77 ISSN: 1488-2159 ISO Abbreviation: J Can Dent Assoc Publication Date: 2011 |
Date Detail:
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Created Date: 2011-04-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7907605 Medline TA: J Can Dent Assoc Country: Canada |
Other Details:
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Languages: eng Pagination: b9 Citation Subset: D; IM |
Affiliation:
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Dalhousie University, Halifax, NS. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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