Assessment of a Bracket-Bonding System's Shear Bond Strength after it has been Cured using Various Light-Curing Units at Different Time Intervals

Abstract

Objectives: To assess a bracket-bonding system's shear bond strength cured with dissimilar light-curing units at different time intervals.

Materials and method: Sixty premolar teeth removed for orthodontic purposes were categorized into four types based on the light-curing unit and exposure times used. The specimens in the halogen group were exposed to light for 15 (Group I) and 30 (Group II) sec, respectively. The specimens were exposed to light for 10 (Group III) and 15 sec in the LED group (Group IV). The amount of adhesive still present on the teeth was measured using a stereomicroscope at a magnification of 10 and was then assessed with the help of adhesive remnant index (ARI).

Result: The group with the highest mean SBS was in Group II followed by Group I, Group III, and the group with the lowest mean SBS. The ARI was unaffected by the light-curing technique, with score 2 predominating.

Conclusion: In all groups, polymerization using halogen and LED led to SBS values that were clinically suitable for orthodontic procedures.

Keywords: Bond strength; light curing; polymerization time.