Year : 2019

Volume : Volume 10

Issue : Issue 2s

Address for correspondence :
Dr. Swati Tripathi.
drswatitripathi18@gmail.com

Abstract

Background:  Purpose of this study was to evaluate the shear bond strength of brackets cured using a halogen light-curing unit and three light-emitting diodes with different light intensities. Material and method: This study was conducted on 180 metal brackets bonded to extracted maxillary first premolars. The sample was divided into six groups of 30 each according to light-curing units and exposure times. Brackets were cured with halogen light (CU-100 A) for 40 seconds and three LEDs (Bluephase Ivoclar, WL-090 Orthosystem, iLed Woodpecker) for 20, 6, 5 seconds. SBS was measured using Instron. Results:  The highest mean shear bond strength was found in group II (Bluephase Ivoclar Curing Light) 20 seconds followed by group VI (iLed Woodpecker) 6 seconds, group V (WL-090 Orthosystem light) 5 seconds, group III (WL-090 (Orthosystem light) 20 seconds, group I (Halogen light) 40 seconds, minimum with group IV (iLed Woodpecker) 20 seconds. There was a significant difference found in SBS of brackets using varying parameters of three LEDs. (p=0.006) Conclusion: Reducing the curing time to 5 - 6 seconds with a high intensity curing lights produced clinically acceptable SBS.

Keywords: LED curing devices, Bond strength, Bracket bonding, Shear bond strength.