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Title: Effect of irradiation times on the polymerization depth of contemporary fissure sealants with different opacities
Authors: Borges, Boniek Castillo Dutra
Bezerra, Gabriela Voany Galdino
Mesquita, Janaína de Almeida
Pereira, Márcia Rodrigues
Aguiar, Flávio Henrique Baggio
Santos, Alex Jose Souza dos
Assunção, Isauremi Vieira de
Keywords: Pit and fissure sealants;Composite resins;Pediatric dentistry
Issue Date: 2011
Citation: BORGES, B. C. D. et al. Effects of irradiation times on the polymerization depth of contemporary fissure sealants with different opacities. Brazilian Oral Research, v. 25, n. 2, p. 135-142, 2011.
Portuguese Abstract: The aim of this study was to evaluate the depth of curing of 10 contemporary blue light-activated dental flowable materials at several opacities, influenced by different irradiation times using FT-IR spectroscopy. Fifty-five specimens (n = 5) with a 5-mm diameter and 1-mm thickness of translucent (Opallis Flow T), yellowed (Master Flow A2; Opallis Flow A2; Natural Flow A2; Fluroshield Yellowed), and opaque materials (Master Flow OA2; Natural Flow O; Opallis Flow OA3.5; Opallis Flow OP; Fluroshield White) were obtained at six curing times (10s, 20s, 30s, 40s, 50s, and 60s) using a high-intensity LED (Coltolux, Coltène/Whaledent). The degree of conversion (DC) (%) was obtained using the Nexus 470 FTIR Spectrometer (Nicolet Instruments, USA). The FTIR-ATR spectra for uncured and cured samples were analyzed using a ZnSe crystal. The top and bottom surfaces of the cured specimens were analyzed to obtain the depth of curing. Two-way ANOVA was used to analyze the data. The highest curing depth was obtained by Natural Flow OA2, while the lowest was shown by Master Flow OA2. The shortest curing time generated similar depths of cure in comparison with the most extensive for Opallis Flow A2 and Fluroshield Yellowed. Therefore, depth of curing, influenced by the irradiation time, was dependent on the materials. Using the Natural Flow OA2 opaque sealant and the 10-s curing time for Opallis Flow A2 and Fluroshield Yellowed may represent alternative approaches to sealing tooth fissures.
ISSN: 1807-3107
Appears in Collections:CCS - DOD - Artigos publicados em periódicos

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