[The effects of Nd:YAG laser-aided debracket on the bonding strength of brackets and the temperature of pulp cavity].
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.
Bai
Ding
D
Dept. of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
Liu
Xiao-lin
XL
D002516:Ceramics; D003786:Dental Pulp Cavity / Q000528:radiation effects*; D053844:Lasers, Solid-State; D013696:Temperature