BOND FAILURE RATE OF AMORPHOUS CALCIUM PHOSPHATE CONTAINING (AEGIS ORTHO) AND FLUORIDE RELEASING (TRANSBOND PLUS COLOUR CHANGE) ORTHODONTIC ADHESIVES-A RANDOMIZED CLINICAL TRIAL

Background: The aim of the study was to compare the survival rate of brackets bonded with amorphous calcium phosphate containing adhesive and fluoride releasing orthodontic adhesive over 6 months period. White spot lesions were also evaluated prior to bonding, 3 months and 6 months from the date of bonding. Methods: Thirty six orthodontic patients were randomly divided into two equal groups using split mouth design. 592 brackets were bonded up to the premolars with either Aegis Ortho or Transbond Colour Change(TPCCA). Bracket failure rate and survival distribution were evaluated and compared using Kaplan- meier analysis and Log rank test with respect to adhesives, dental arches, segments , tooth types, gender and age groups. White spot lesion was assessed using WSL index. Results: There was no significant difference between the failure rate of Aegis Ortho(3.0%) and TPCCA(1.4%). Kaplan Meier analysis, Log rank test showed that the difference in the overall failure rate and survival time between the arches, gender, and different age groups were not statistically significant. Both adhesives had a high bond failure rate in the posterior segment especially in the premolar region. Three patients had white spot lesions in the upper premolar region bonded with Aegis ortho. Conclusion: Both Aegis ortho and Transbond plus colour change adhesive with a low bond failure rate can be used as an alternative orthodontic adhesive. Key words : bond failure, amorphous calcium phosphate, transbond colour change adhesive, white spot lesions.