Composite depth of cure using four polymerization techniques
The light-curing technique is relevant to reduce the degree of polymerization shrinkage, improving clinical and esthetic success of composite resin restorations. OBJECTIVE: To evaluate in vitro the effect of four light-curing techniques on depth of cure of a composite resin. MATERIAL AND METHODS: Te...
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University of São Paulo
2009-10-01
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doaj-393af016f9a246c7aa22ec416496544d2020-11-24T20:44:56ZengUniversity of São PauloJournal of Applied Oral Science1678-77571678-77652009-10-0117544645010.1590/S1678-77572009000500018Composite depth of cure using four polymerization techniquesEricson Janolio de CamargoEduardo MoreschiWagner BaseggioJaime Aparecido CuryRenata Corrêa PascottoThe light-curing technique is relevant to reduce the degree of polymerization shrinkage, improving clinical and esthetic success of composite resin restorations. OBJECTIVE: To evaluate in vitro the effect of four light-curing techniques on depth of cure of a composite resin. MATERIAL AND METHODS: Ten specimens of a composite resin were made in cylindrical cavities prepared in PVC plates (3.0 X 7.0 mm) for each light-curing technique. Four photoactivation methods were investigated: stepped, ramped, pulse-delay and traditional. Specimens were longitudinally sectioned and polished for microhardness measurements (kg/mm²), which were made at 0.1, 1.0, 2.0 and 4.0 mm from the irradiated surface. Data were subjected to ANOVA and Tukey's test. RESULTS: The effect of factors studied (curing method and distance from the surface) and the interaction of these factors was statistically significant (p<0.05). The traditional method of cure provided higher microhardness values (69.6 ± 2.5) than the stepped (63.5 ± 3.1) and pulsed (63.9 ± 3.2) methods at all depths evaluated, but it did not differ from the ramped method (66.7± 4.4) at 0.1 and 1.0 mm of depth. CONCLUSION: All techniques employed provided satisfactory cure of the composite resin up to the depth of 2.0 mm from the irradiated surface.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572009000500018Composite resinsCureBisphenol A-Glycidyl Methacrylate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ericson Janolio de Camargo Eduardo Moreschi Wagner Baseggio Jaime Aparecido Cury Renata Corrêa Pascotto |
spellingShingle |
Ericson Janolio de Camargo Eduardo Moreschi Wagner Baseggio Jaime Aparecido Cury Renata Corrêa Pascotto Composite depth of cure using four polymerization techniques Journal of Applied Oral Science Composite resins Cure Bisphenol A-Glycidyl Methacrylate |
author_facet |
Ericson Janolio de Camargo Eduardo Moreschi Wagner Baseggio Jaime Aparecido Cury Renata Corrêa Pascotto |
author_sort |
Ericson Janolio de Camargo |
title |
Composite depth of cure using four polymerization techniques |
title_short |
Composite depth of cure using four polymerization techniques |
title_full |
Composite depth of cure using four polymerization techniques |
title_fullStr |
Composite depth of cure using four polymerization techniques |
title_full_unstemmed |
Composite depth of cure using four polymerization techniques |
title_sort |
composite depth of cure using four polymerization techniques |
publisher |
University of São Paulo |
series |
Journal of Applied Oral Science |
issn |
1678-7757 1678-7765 |
publishDate |
2009-10-01 |
description |
The light-curing technique is relevant to reduce the degree of polymerization shrinkage, improving clinical and esthetic success of composite resin restorations. OBJECTIVE: To evaluate in vitro the effect of four light-curing techniques on depth of cure of a composite resin. MATERIAL AND METHODS: Ten specimens of a composite resin were made in cylindrical cavities prepared in PVC plates (3.0 X 7.0 mm) for each light-curing technique. Four photoactivation methods were investigated: stepped, ramped, pulse-delay and traditional. Specimens were longitudinally sectioned and polished for microhardness measurements (kg/mm²), which were made at 0.1, 1.0, 2.0 and 4.0 mm from the irradiated surface. Data were subjected to ANOVA and Tukey's test. RESULTS: The effect of factors studied (curing method and distance from the surface) and the interaction of these factors was statistically significant (p<0.05). The traditional method of cure provided higher microhardness values (69.6 ± 2.5) than the stepped (63.5 ± 3.1) and pulsed (63.9 ± 3.2) methods at all depths evaluated, but it did not differ from the ramped method (66.7± 4.4) at 0.1 and 1.0 mm of depth. CONCLUSION: All techniques employed provided satisfactory cure of the composite resin up to the depth of 2.0 mm from the irradiated surface. |
topic |
Composite resins Cure Bisphenol A-Glycidyl Methacrylate |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572009000500018 |
work_keys_str_mv |
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