Document Type : Original Article

Authors

1 Narsinhbhai patel dental college and hospital ,visnagar

2 narsinhbhai patel dental college and hospital

3 Professor Dr. Ajay Kubavat MDS Professor and Head, Orthodontics Narsinhbhai Patel Dental College and Hospital, Sankalchand Patel University, Visnagar India 384315

4 narsinhbhai patel dental college and hospital,visnagar

Abstract

The aim of this study was to evaluate the shear bond strength of orthodontic brackets following early and delayed rebonding and after employing different methods of composite removal.It is an in vitro study.60 premolars were randomly assigned in to 4 groups after initial debonding and recording the SBS, ARI index was assessed, as defined by Artun and Bergland .the removal of adhesive remnants in the group 1 by round bur, group 2 by a rubber wheel bur, group 3 by 12 fluted tungsten carbide bur & in 4th group by scaler. & in all group after adhesive removal teeth were kept in artificial saliva for 1 month. Then rebonding with new bracket was done to measure second SBS and ARI Index.2 representative samples from each group were examined under a scanning electron microscope following adhesive removal. After primary bonding there was no statistically significant difference in SBS value within the groups, but there was a significant difference between primary and secondary bonding SBS values after removal of adhesive remnant with different methods.There was significant decrease in secondary SBS value in group 1 .Group 3 (tungsten carbide bur) shows significant increase in secondary SBS value.group 4 shows slight decrease in SBS.SEM photograph shows composite remnants in all the 4 groups, but there are fewer remnants in group 2 suggesting better option for tooth surface cleaning.SEM image of group 3 shows enamel surface damage. ARI index shows no significant difference .

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