Effect of light sources and curing mode techniques on sorption, solubility and biaxial flexural strength of a composite resin
J. appl. oral sci
;
20(2): 246-252, Mar.-Apr. 2012. tab
Article
in English
| LILACS
| ID: lil-626429
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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Composite Resins
/
Light-Curing of Dental Adhesives
/
Curing Lights, Dental
Type of study:
Evaluation studies
Limits:
Humans
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2012
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Goiás/BR
/
Federal University of Uberlândia/BR
/
University of São Paulo/BR
Similar
MEDLINE
...
LILACS
LIS