title: Polymerization efficiency of high-intensity LEDs with different exposure times.
abstract: 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.
authors.affiliation: Department of Restorative Dentistry, Sao Jose dos Campos School of Dentistry, Sao Paulo State University, Brazil.
authors.forename: Fernanda Brandao
authors.initials: FB
authors.lastname: Mollica
authors.forename: Melissa Aline
authors.initials: MA
authors.lastname: Silva
authors.forename: Maria Amelia Maximo
authors.initials: MA
authors.lastname: de Araujo
authors.forename: Maria Filomena R Lima
authors.initials: MF
authors.lastname: Huhtala
authors.forename: Ivan
authors.initials: I
authors.lastname: Balducci
mesh_terms: 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
chemical_list: D003188:Composite Resins; D006219:Halogens