| Quantifying light energy delivered to a Class I restoration. | |
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MedLine Citation:
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PMID: 20388311 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To measure the amount of light energy that dental students actually deliver to a Class I preparation in a dental mannequin. MATERIALS AND METHODS: Approval for the study was obtained from the Dalhousie University Health Sciences Research Ethics Board. Each of 20 third-year dental students light-cured a Class I preparation in tooth 27 in a mannequin head. A photodetector located at the bottom of the cavity preparation measured how much light would be received by a restoration. Each student cured the simulated restoration for 20 seconds using a quartz-tungsten-halogen curing light (Optilux 401). The irradiance received (mW/cm2) was recorded in real time, and the energy per unit area (J/cm2) delivered to the detector by each student was calculated. The students were then given detailed instructions on how to effectively use the curing light, and the experiment was repeated. RESULTS: When the curing light was fixed directly over the tooth, the greatest amount of light energy delivered to the detector in 20 seconds was 13.9 +/- 0.4 J/cm2. Before instruction, the students delivered between 2.0 and 12.0 J/cm2 (mean +/- standard deviation [SD]: 7.9 +/- 2.7 J/cm2). After receiving detailed instructions, the same students delivered between 7.7 and 13.4 J/cm2 (mean +/- SD: 10.0 +/- 1.4 J/cm2). A paired student"s t test showed that instruction resulted in a significant improvement (p < 0.001). CONCLUSIONS: Although instruction yielded improvements, the mean energy delivered was much less (7.9 J/cm2 before instruction and 10.0 J/cm2 after instruction) than the expected 13.9 J/cm2. To maximize the energy delivered, the operator should wear eye protection, should watch what he or she is doing and should hold the light both close to and perpendicular to the restoration. |
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Authors:
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Richard B T Price; Melanie E McLeod; Christopher M Felix |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal (Canadian Dental Association) Volume: 76 ISSN: 1488-2159 ISO Abbreviation: J Can Dent Assoc Publication Date: 2010 |
Date Detail:
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Created Date: 2010-04-14 Completed Date: 2010-10-08 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: a23 Citation Subset: D; IM |
Affiliation:
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Department of Dental Clinical Sciences, Dalhousie University, Halifax, Nova Scotia. rbprice@dal.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Composite Resins / radiation effects Curing Lights, Dental* Dental Bonding, Light-Cured / methods* Dental Restoration, Permanent / classification, methods* Dentistry, Operative / education Eye Protective Devices Hardness Tests Humans Manikins Photometry Students, Dental |
| Grant Support | |
ID/Acronym/Agency:
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//Canadian Institutes of Health Research |
| Chemical | |
Reg. No./Substance:
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0/Composite Resins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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