Effect of light sources and curing mode techniques on sorption, solubility and biaxial flexural strength of a composite resin
J. appl. oral sci
; J. appl. oral sci;20(2): 246-252, Mar.-Apr. 2012. tab
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| ID: lil-626429
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ABSTRACT
Adequate polymerization plays an important role on the longevity of the composite resin restorations. OBJECTIVES:
The aim of this study was to evaluate the effect of light-curing units, curing mode techniques and storage media on sorption, solubility and biaxial flexural strength (BFS) of a composite resin. MATERIAL ANDMETHODS:
Two hundred and forty specimens were made of one composite resin (Esthet-X) in a stainless steel mold (2 mm x 8 mm Ø), and divided into 24 groups (n=10) established according to the 4 study factors light-curing units quartz tungsten halogen (QTH) lamp and light-emitting diodes (LED); energy densities 16 J/cm² and 20 J/cm²; curing modes conventional (CM) and pulse-delay (PD); and permeants deionized water and 75% ethanol for 28 days. Sorption and solubility tests were performed according to ISO 40492000 specifications. All specimens were then tested for BFS according to ASTM F394-78 specification. Data were analyzed by three-way ANOVA followed by Tukey, Kruskal-Wallis and Mann-Whitney tests (α=0.05).RESULTS:
In general, no significant differences were found regarding sorption, solubility or BFS means for the light-curing units and curing modes (p>0.05). Only LED unit using 16 J/cm² and PD using 10 s produced higher sorption and solubility values than QTH. Otherwise, using CM (16 J/cm²), LED produced lower values of BFS than QTH (p<0.05). 75% ethanol permeant produced higher values of sorption and solubility and lower values of BFS than water (p<0.05).CONCLUSION:
Ethanol storage media produced more damage on composite resin than water. In general the LED and QTH curing units using 16 and 20 J/cm² by CM and PD curing modes produced no influence on the sorption, solubility or BFS of the tested resin.Palavras-chave
Texto completo:
1
Bases de dados:
LILACS
Assunto principal:
Resinas Compostas
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Cura Luminosa de Adesivos Dentários
/
Lâmpadas de Polimerização Dentária
Tipo de estudo:
Evaluation_studies
Limite:
Humans
Idioma:
En
Revista:
J Appl Oral Sci
/
J. appl. oral sci
/
J. appl. oral sci. (Online)
/
Journal of applied oral science (Impresso)
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Brasil