| Esthetic brackets: the influence of filler level on color stability. | |
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MedLine Citation:
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PMID: 17628243 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: An undesirable effect of plastic brackets is their discoloration after a short time in the oral cavity. The objective of this study was to investigate the influence of the filler level of plastic brackets on color stability after exposure to food dyes or ultraviolet (UV) light. METHODS: Three bracket groups were produced with silicon dioxide as the filler: an unfilled urethane-dimethacrylate (UDMA) bracket, a UDMA bracket with filler content of 35% by volume, and a UDMA bracket with filler level of 70% by volume. All brackets were exposed for 72 hours to UV light in an aging device with a xenon lamp to simulate natural daylight or to food dyes (cola or tea). Color measurements were made with a spectrophotometer according to the CIE L*a*b* system, and color changes (DeltaE*) were computed. RESULTS: Greater exogenous discoloration was observed by raising the filler level of UDMA brackets. Almost all investigated polymer brackets showed clinically acceptable color stability during in-vitro exposure to colorants. However, almost all brackets seemed more yellow after UV light treatment. CONCLUSIONS: Silicon-dioxide filler-reinforced UDMA brackets showed an obvious trend for increased exogenous discoloration when filler level was raised. Highly filled brackets were less susceptible to endogenous discoloration caused by UV light. |
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Authors:
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Andreas Faltermeier; Michael Behr; Dieter Müssig |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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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: 132 ISSN: 1097-6752 ISO Abbreviation: Am J Orthod Dentofacial Orthop Publication Date: 2007 Jul |
Date Detail:
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Created Date: 2007-07-13 Completed Date: 2007-07-24 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8610224 Medline TA: Am J Orthod Dentofacial Orthop Country: United States |
Other Details:
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Languages: eng Pagination: 5.e13-6 Citation Subset: D; IM |
Affiliation:
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Department of Orthodontics, University Medical Center of Regensburg, Regensburg, Germany. Andreas.Faltermeier@klinik.uni-regensburg.de |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Color Colorimetry Esthetics, Dental* Food Coloring Agents Materials Testing Methacrylates* / chemistry, radiation effects Orthodontic Brackets* Polyurethanes* / chemistry, radiation effects Silicon Dioxide / radiation effects Ultraviolet Rays |
| Chemical | |
Reg. No./Substance:
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0/Food Coloring Agents; 0/Methacrylates; 0/Polyurethanes; 0/polyurethane dimethacrylate; 7631-86-9/Silicon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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