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https://repositorio.ufba.br/handle/ri/14962
metadata.dc.type: | Artigo de Periódico |
Title: | Influence of the curing method on the post-polymerization shrinkage stress of a composite resin |
Other Titles: | Journal of Applied Oral Science |
Authors: | Cunha, Leonardo Gonçalves Alonso, Roberta Caroline Bruschi Souza Junior, Eduardo José Carvalho de Neves, Ana Christina Elias Claro Correr Sobrinho, Lourenço Sinhoreti, Mário Alexandre Coelho |
metadata.dc.creator: | Cunha, Leonardo Gonçalves Alonso, Roberta Caroline Bruschi Souza Junior, Eduardo José Carvalho de Neves, Ana Christina Elias Claro Correr Sobrinho, Lourenço Sinhoreti, Mário Alexandre Coelho |
Abstract: | The aim of this study was to evaluate the effect of different curing methods on the stress generated by the polymerization shrinkage of a restorative composite in two moments: immediately after light exposure and after 5 min. Photoactivation was performed using two different light sources: (1) xenon plasma arc (PAC) light (1,500 mW/cm2 - 3s) and (2) a quartz-tungsten-halogen (QTH) light with three light-curing regimens: continuous exposure (40 s at 800 mW/cm2 - CL); soft-start (10 s at 150 mW/cm2 and 30 s at 800 mW/cm2 - SS) and intermittent light [cycles of 4 s (2 s with light on at 600 mW/cm2 and 2 s of light off), for 80s - IL]. The composite resin was applied between two 5-mm diameter metallic rods, mounted in a servohydraulic machine. The maximum stress was recorded immediately after light exposure (FF) and after 5 min (5F). The results were submitted to ANOVA and Tukey's test (5%). For each method, the results obtained in FF and 5F were, respectively: CL (3.58 and 4.46 MPa); SS (2.99 and 4.36 MPa); IL (3.11 and 4.32 MPa) and PAC (0.72 and 3.27 MPa). The stress generated by the polymerization shrinkage during light exposure can be associated with the photoactivation method used. A significant increase in the stress level was observed during the post-curing period up to 5 min, for all evaluated methods. |
Keywords: | Composite resins Stress Post-curing |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/14962 |
Issue Date: | 2008 |
Appears in Collections: | Artigo Publicado em Periódico (Faculdade de Odontologia) |
Files in This Item:
File | Description | Size | Format | |
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1678-77572008000400007.pdf | 100,39 kB | Adobe PDF | View/Open |
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