Influence of the curing method on the post-polymerization shrinkage stress of a composite resin
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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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University of São Paulo
2008-08-01
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| Series: | Journal of Applied Oral Science |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572008000400007 |
| _version_ | 1828169818951385088 |
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| author | Leonardo Gonçalves Cunha Roberta Caroline Bruschi Alonso Eduardo José Carvalho de Souza-Junior Ana Christina Elias Claro Neves Lourenço Correr-Sobrinho Mário Alexandre Coelho Sinhoreti |
| author_facet | Leonardo Gonçalves Cunha Roberta Caroline Bruschi Alonso Eduardo José Carvalho de Souza-Junior Ana Christina Elias Claro Neves Lourenço Correr-Sobrinho Mário Alexandre Coelho Sinhoreti |
| author_sort | Leonardo Gonçalves Cunha |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T02:57:11Z |
| format | Article |
| id | doaj.art-70ed11e96e3b49e8903f851d8d2747f5 |
| institution | Directory Open Access Journal |
| issn | 1678-7757 1678-7765 |
| language | English |
| last_indexed | 2024-04-12T02:57:11Z |
| publishDate | 2008-08-01 |
| publisher | University of São Paulo |
| record_format | Article |
| series | Journal of Applied Oral Science |
| spelling | doaj.art-70ed11e96e3b49e8903f851d8d2747f52022-12-22T03:50:45ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652008-08-0116426627010.1590/S1678-77572008000400007Influence of the curing method on the post-polymerization shrinkage stress of a composite resinLeonardo Gonçalves CunhaRoberta Caroline Bruschi AlonsoEduardo José Carvalho de Souza-JuniorAna Christina Elias Claro NevesLourenço Correr-SobrinhoMário Alexandre Coelho SinhoretiThe 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572008000400007Composite resinsStressPost-curing |
| spellingShingle | Leonardo Gonçalves Cunha Roberta Caroline Bruschi Alonso Eduardo José Carvalho de Souza-Junior Ana Christina Elias Claro Neves Lourenço Correr-Sobrinho Mário Alexandre Coelho Sinhoreti Influence of the curing method on the post-polymerization shrinkage stress of a composite resin Journal of Applied Oral Science Composite resins Stress Post-curing |
| title | Influence of the curing method on the post-polymerization shrinkage stress of a composite resin |
| title_full | Influence of the curing method on the post-polymerization shrinkage stress of a composite resin |
| title_fullStr | Influence of the curing method on the post-polymerization shrinkage stress of a composite resin |
| title_full_unstemmed | Influence of the curing method on the post-polymerization shrinkage stress of a composite resin |
| title_short | Influence of the curing method on the post-polymerization shrinkage stress of a composite resin |
| title_sort | influence of the curing method on the post polymerization shrinkage stress of a composite resin |
| topic | Composite resins Stress Post-curing |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572008000400007 |
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