title: [The effects of Nd:YAG laser-aided debracket on the bonding strength of brackets and the temperature of pulp cavity].
abstract: OBJECTIVE
  To study the best parameter of impulse Nd:YAG Laser-aided debracket.
  
  
  METHODS
  To measure the bonding strength of ceramic bracket and pulp cavity temperature after different laser energy. First group was not irradiated by laser, second group was irradiated by laser of power 5 W and irradiating duration 2 s, third group was power 3 W and duration 3 s, and fourth group was power 2 W and duration 5 s.
  
  
  RESULTS
  There were significant differences of bonding strength among the four groups. The bonding strength of ceramic bracket was significantly reduced by laser irradiating. There were significant differences of the pulp cavity temperature increasing among different laser power irradiating groups. The lowest temperature increasing (3.65 degrees C) group was the group of laser power 3 W and irradiating duration 3 s.
  
  
  CONCLUSIONS
  The bonding strength of ceramic brackets was statistically reduced after laser irradiation and the best parameter of impulse Nd:YAG Laser-aided debracket is laser power 3 W and irradiating duration 3 s.
authors.affiliation: Dept. of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Ding
authors.initials: D
authors.lastname: Bai
authors.forename: Xiao-lin
authors.initials: XL
authors.lastname: Liu
mesh_terms: D002516:Ceramics; D003786:Dental Pulp Cavity / Q000528:radiation effects*; D053844:Lasers, Solid-State; D013696:Temperature