Effect of different photoactivation techniques on the bond strength of a dental composite

Using the push-out test, this study evaluated the bond strength of the composite resin Z250 (3M/ESPE) photoactivated with the XL2500 (3M/ESPE) quartz-tungsten-halogen light-curing unit with different curing protocols: soft-start (150 mW/cm2 for 2 s (S2), 3 s (S3), 5 s (S5), 10 s (S10) or 15 s (S15), followed by 700 mW/cm2 for 15 s; pulse-delay (150 mW/cm2 for 2 s (P2), 3 s (P3), 5 s (P5), 10 s (P10) or 15 s (P15), with a 1-min delay, followed by 700 mW/cm2 for 15 s. After storage at 37oC ± 1 for 24 h ± 1, the specimens were ground, polished and subjected to a push-out test in a universal test machine (Instron) with a cell load of 500 N at a crosshead speed of 0.5 mm/min. The data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. There were no statistically significant differences (p&gt;0.05) among the groups photoactivated using the soft-start mode. For the pulse-delay mode, P5 promoted the highest bond strength (p<0.05). Groups photoactivated with the pulse-delay mode (except for P2 and P15) presented significantly higher bond strength than those photoactivated with the soft-start. It may be concluded that the influence of initial exposure time was curing method-dependent, with the best results obtained using the pulse-delay method with 5 s in the first photoactivation cycle.

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Main Authors: Dall'Magro,Eduardo, Correr,Américo Bortolazzo, Costa,Ana Rosa, Correr,Gisele Maria, Consani,Rafael Leonardo Xediek, Correr-Sobrinho,Lourenço, Sinhoreti,Mário Alexandre Coelho
Format: Digital revista
Language:English
Published: Fundação Odontológica de Ribeirão Preto 2010
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402010000300008
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spelling oai:scielo:S0103-644020100003000082010-09-08Effect of different photoactivation techniques on the bond strength of a dental compositeDall'Magro,EduardoCorrer,Américo BortolazzoCosta,Ana RosaCorrer,Gisele MariaConsani,Rafael Leonardo XediekCorrer-Sobrinho,LourençoSinhoreti,Mário Alexandre Coelho pulse-delay soft-start bond strength Using the push-out test, this study evaluated the bond strength of the composite resin Z250 (3M/ESPE) photoactivated with the XL2500 (3M/ESPE) quartz-tungsten-halogen light-curing unit with different curing protocols: soft-start (150 mW/cm2 for 2 s (S2), 3 s (S3), 5 s (S5), 10 s (S10) or 15 s (S15), followed by 700 mW/cm2 for 15 s; pulse-delay (150 mW/cm2 for 2 s (P2), 3 s (P3), 5 s (P5), 10 s (P10) or 15 s (P15), with a 1-min delay, followed by 700 mW/cm2 for 15 s. After storage at 37oC ± 1 for 24 h ± 1, the specimens were ground, polished and subjected to a push-out test in a universal test machine (Instron) with a cell load of 500 N at a crosshead speed of 0.5 mm/min. The data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. There were no statistically significant differences (p&gt;0.05) among the groups photoactivated using the soft-start mode. For the pulse-delay mode, P5 promoted the highest bond strength (p<0.05). Groups photoactivated with the pulse-delay mode (except for P2 and P15) presented significantly higher bond strength than those photoactivated with the soft-start. It may be concluded that the influence of initial exposure time was curing method-dependent, with the best results obtained using the pulse-delay method with 5 s in the first photoactivation cycle.info:eu-repo/semantics/openAccessFundação Odontológica de Ribeirão PretoBrazilian Dental Journal v.21 n.3 20102010-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402010000300008en10.1590/S0103-64402010000300008
institution SCIELO
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country Brasil
countrycode BR
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databasecode rev-scielo-br
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region America del Sur
libraryname SciELO
language English
format Digital
author Dall'Magro,Eduardo
Correr,Américo Bortolazzo
Costa,Ana Rosa
Correr,Gisele Maria
Consani,Rafael Leonardo Xediek
Correr-Sobrinho,Lourenço
Sinhoreti,Mário Alexandre Coelho
spellingShingle Dall'Magro,Eduardo
Correr,Américo Bortolazzo
Costa,Ana Rosa
Correr,Gisele Maria
Consani,Rafael Leonardo Xediek
Correr-Sobrinho,Lourenço
Sinhoreti,Mário Alexandre Coelho
Effect of different photoactivation techniques on the bond strength of a dental composite
author_facet Dall'Magro,Eduardo
Correr,Américo Bortolazzo
Costa,Ana Rosa
Correr,Gisele Maria
Consani,Rafael Leonardo Xediek
Correr-Sobrinho,Lourenço
Sinhoreti,Mário Alexandre Coelho
author_sort Dall'Magro,Eduardo
title Effect of different photoactivation techniques on the bond strength of a dental composite
title_short Effect of different photoactivation techniques on the bond strength of a dental composite
title_full Effect of different photoactivation techniques on the bond strength of a dental composite
title_fullStr Effect of different photoactivation techniques on the bond strength of a dental composite
title_full_unstemmed Effect of different photoactivation techniques on the bond strength of a dental composite
title_sort effect of different photoactivation techniques on the bond strength of a dental composite
description Using the push-out test, this study evaluated the bond strength of the composite resin Z250 (3M/ESPE) photoactivated with the XL2500 (3M/ESPE) quartz-tungsten-halogen light-curing unit with different curing protocols: soft-start (150 mW/cm2 for 2 s (S2), 3 s (S3), 5 s (S5), 10 s (S10) or 15 s (S15), followed by 700 mW/cm2 for 15 s; pulse-delay (150 mW/cm2 for 2 s (P2), 3 s (P3), 5 s (P5), 10 s (P10) or 15 s (P15), with a 1-min delay, followed by 700 mW/cm2 for 15 s. After storage at 37oC ± 1 for 24 h ± 1, the specimens were ground, polished and subjected to a push-out test in a universal test machine (Instron) with a cell load of 500 N at a crosshead speed of 0.5 mm/min. The data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. There were no statistically significant differences (p&gt;0.05) among the groups photoactivated using the soft-start mode. For the pulse-delay mode, P5 promoted the highest bond strength (p<0.05). Groups photoactivated with the pulse-delay mode (except for P2 and P15) presented significantly higher bond strength than those photoactivated with the soft-start. It may be concluded that the influence of initial exposure time was curing method-dependent, with the best results obtained using the pulse-delay method with 5 s in the first photoactivation cycle.
publisher Fundação Odontológica de Ribeirão Preto
publishDate 2010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402010000300008
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