RESUMO
This study sought to evaluate the temperature variations in bovine dentin when cured with high-intensity LED appliances and quartz-tungsten-halogen (QTH) appliances. Forty-five slices of bovine dentin (0.7 mm thick) were divided into three groups. Temperature variations were measured during polymerization of the adhesive (10 seconds), during polymerization of the resin composite (40 seconds), and 24 hours after the resin composite polymerization. The data were submitted to the ANOVA repeated measures test, which showed a statistically significant difference in the interaction factor (p = 0.0001). Tukey's test (p = 5%) revealed that the SmartLite PS LED appliance caused a significantly higher temperature increase than the other appliances following polymerization of the adhesive, that both LED appliances produced significantly greater temperature increases than the QTH curing light during polymerization of the resin composite, and that the SmartLite PS produced the greatest temperature increase after 24 hours.
Assuntos
Temperatura Corporal , Lâmpadas de Polimerização Dentária , Dentina , Cura Luminosa de Adesivos Dentários , Animais , Bovinos , Resinas Compostas/química , Resinas Compostas/efeitos da radiação , Dentina/fisiologia , Temperatura Alta , Cimentos de Resina/química , Cimentos de Resina/efeitos da radiaçãoRESUMO
This study compared two high-intensity light-emitting diode (LED) appliances to a quartz-halogen-tungsten (QTH) appliance and measured their ability to polymerize resin composite efficiently. Eighty-four test specimens (2 mm x 5 mm) were made of resin composite and exposed to one of the two LED appliances for 10, 20, or 40 seconds; the QTH appliance was used as a control group for 40 seconds. It was concluded that using the high-intensity LEDs for 20 seconds produced microhardness similar to that produced by using the QTH appliance for 40 seconds, but the high intensity LEDs did not improve depth of cure.
