Polymerization efficiency of high-intensity LEDs with different exposure times.
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.
Mollica
Fernanda Brandao
FB
Department of Restorative Dentistry, Sao Jose dos Campos School of Dentistry, Sao Paulo State University, Brazil.
Silva
Melissa Aline
MA
de Araujo
Maria Amelia Maximo
MA
Huhtala
Maria Filomena R Lima
MF
Balducci
Ivan
I
D003188:Composite Resins / Q000528:radiation effects; D055117:Curing Lights, Dental; D006219:Halogens; D006244:Hardness; D055115:Light-Curing of Dental Adhesives; D058105:Polymerization; D012666:Semiconductors; D013997:Time Factors
D003188:Composite Resins; D006219:Halogens