Purpose: The purpose of this study was to evaluate the influence of the light curing tip distance and material opacity on hardness (KHN), degree of conversion (DC), and crosslink density (CLD) of a resin-based fissure sealant (Fluroshield). Methods: One-millimeter-thick
white opaque and clear sealant specimens, photoactivated at 1-, 2-, and 3-mm distances, were fabricated (8 groups, N=5). KHN and DC were evaluated 24 hours after polymerization. Specimens were subjected to a new KHN reading after 24-hour immersion in absolute ethanol to indirectly assess the
CLD. Results: Samples of clear sealant cured at longer distances presented lower KHN, although there were not differences between opacities at all distances. The mean DC of the opaque white material, however, was lower than that of the clear one at higher distances. There were no differences
among CLD for all experimental conditions analyzed. Conclusions: KHN of the clear sealant was affected by increased distances. The clear sealant showed higher DC at increased distances, although CLD was not influenced by the factors under study. Since physical properties of sealing
materials are directly related to their clinical efficacy, the clear sealant tested may present a better clinical performance than the opaque one.
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DEGREE OF CONVERSION;
Document Type: Research Article
MSc student, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil;, Email: [email protected]
Undergraduate, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
PhD student, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
Professor, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
Publication date: 01 November 2011
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Pediatric Dentistry is the official publication of the American Academy of Pediatric Dentistry, the American Board of Pediatric Dentistry and the College of Diplomates of the American Board of Pediatric Dentistry. It is published bi-monthly and is internationally recognized as the leading journal in the area of pediatric dentistry. The journal promotes the practice, education and research specifically related to the specialty of pediatric dentistry. This peer-reviewed journal features scientific articles, case reports and abstracts of current pediatric dental research.
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