Borisorn UdomthanapornPassiri NisalakPornrachanee SawaengkitMahidol University2018-12-212019-03-142018-12-212019-03-142017-01-01Key Engineering Materials. Vol.723 KEM, (2017), 376-381101398262-s2.0-85009152933https://repository.li.mahidol.ac.th/handle/123456789/42623© 2017 Trans Tech Publications, Switzerland. To evaluate and compare shear bond strength (SBS) and Adhesive Remnant Index (ARI) of orthodontic brackets polymerized by high-intensity light-emitting diode (LED) curing units at different intensities and curing times. Sixty extracted human upper premolar teeth were divided into 3 groups of 20 each. The tooth surfaces were prepared and the brackets were bonded on the teeth with light-cured adhesive and cured with 3 different light-curing units and conditions; Group 1 (Bluephase, 1,200 mW/cm2, 20 seconds), Group 2 (VALO, 3,200 mW/cm2, 6 seconds), Group 3 (FlashMax P3, 4,000-6,000 mW/cm2, 3 seconds). Shear bond strength of the specimens were tested after bracket bonding for 5 minutes. The means of shear bond strength among groups were compared by Kruskal-Wallis and Mann-Whitney U tests. ARI were tested by the Fisher's exact test (p < 0.05). The means and standard deviations of SBS in groups 1, 2 and 3 were 21.80 ± 2.85, 21.04 ± 2.87 and 4.75 ± 2.82 MPa, respectively. Group 3 had significantly lowest mean SBS. Significant difference of ARI was found between Bluephase and VALO groups (p = .010). FlashMax P3 curing at 3 seconds generated significantly lowest mean SBS among 3 groups. The SBS generated by VALO curing at 6 seconds was not significantly different from Bluephase curing at 20 seconds. Therefore, VALO can be an option for orthodontic bracket bonding benefited in reducing clinician chairtime and patient discomfort.Mahidol UniversityEngineeringConference PaperSCOPUS10.4028/www.scientific.net/KEM.723.376