title: 405 nm diode laser, halogen lamp and LED device comparison in dental composites cure: an "in vitro" experimental trial.
abstract: OBJECTIVE
  A 405 nm diode laser is indicated for composite materials polymerizing, thanks to the recent evolution in their compositions, absorbing in blue part of the spectrum. The purpose of this research was to evaluate its performance on two different kinds of composite resins.
  
  
  METHODS
  Two different composites were polymerized with a traditional halogen lamp, a LED device and a 405 nm diode laser. The depth of the cure, the volumetric shrinkage, and the degree of the conversion (DC%) of the double bond during the curing process were measured. One-way ANOVA test, Kruskal-Wallis tests, and Dunn comparison tests were used for statistic analysis.
  
  
  RESULTS
  Regarding the depth of polymerization, the laser had the worst performance on one composite while on the other, no significant difference with the other devices was observed. The volumetric shrinkage showed that laser produced the lowest change in both of the composites. The DC% measure confirmed these findings.
  
  
  CONCLUSIONS
  Based on the results of this preliminary study, it is not possible to recommend the 405 nm diode laser for the polymerization of dental composites.
authors.affiliation: Group of Applied ElectroMagnetic, Information Engineering Department, University of Parma, Parma, Italy; Micoralis Laboratory, Faculty of Dentistry, University of Nice, Nice, France.
authors.forename: C
authors.initials: C
authors.lastname: Fornaini
authors.affiliation: Micoralis Laboratory, Faculty of Dentistry, University of Nice, Nice, France.
authors.forename: G
authors.initials: G
authors.lastname: Lagori
authors.affiliation: Micoralis Laboratory, Faculty of Dentistry, University of Nice, Nice, France.
authors.forename: E
authors.initials: E
authors.lastname: Merigo
authors.affiliation: Micoralis Laboratory, Faculty of Dentistry, University of Nice, Nice, France.
authors.forename: J-P
authors.initials: JP
authors.lastname: Rocca
authors.affiliation: Micoralis Laboratory, Faculty of Dentistry, University of Nice, Nice, France.
authors.forename: M
authors.initials: M
authors.lastname: Chiusano
authors.affiliation: Group of Applied ElectroMagnetic, Information Engineering Department, University of Parma, Parma, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Cucinotta
keywords: 405 nm; Diode; LED; composite; laser; polymerization