Effect of DPSS laser on the shear bond strength of orthodontic brackets.
OBJECTIVE
To test the bonding of orthodontic brackets to teeth using a diode-pumped solid state (DPSS) laser.


METHODS
A total of 60 extracted human teeth were divided randomly into four groups: Group 1 (control)--he brackets were bonded to teeth using the quartz-tungsten-halogen (QTH) light (800 mW/cm2) for 40 seconds; Groups 2-4--the brackets were bonded to teeth using the DPSS laser (500 mW/cm2) for 40 seconds, 20 seconds, and 10 seconds, respectively. The teeth were debonded using shear force in a universal testing machine, and the amount of residual adhesive remaining on each tooth was evaluated. Statistical analysis was carried out for the shear bond strength (SBS) and Adhesive Remnant Index (ARI).


RESULTS
The brackets bonded using the DPSS laser for 40 seconds showed the highest mean SBS (13.1 +/- 1.2 MPa) among the groups. Furthermore, the DPSS laser with 10 seconds light-curing could achieve 83% of the mean SBS obtained using the QTH light for 40 seconds. The ARI scores showed no differences among all four groups suggesting a similar failure mode.
Department of Orthodontics, College of Dentistry, Pusan National University, Busan, Korea.
Soo-Byung
SB
Park
Eun-Hee
EH
Kang
Woo-Sung
WS
Son
Ching-Chang
CC
Ko
Hyung-Il
HI
Kim
Yong Hoon
YH
Kwon
D000134:Acid Etching, Dental; D055117:Curing Lights, Dental / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D053844:Lasers, Solid-State; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation / Q000379:methods*; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry / Q000528:radiation effects*; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
D010756:Phosphoric Acids; D019279:Resin Cements; C477790:Transbond XT; D014867:Water; C030242:phosphoric acid
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