Clinical evaluation of bonded brackets for three composite bonding systems

Abstract

Bonding the teeth with orthodontic brackets via orthodonticadhesive is essential stage in orthodontic treatment. But,still the failure bracket due to orthodontic or functional forcescould be the predominant problem through the orthodontictreatment, in addition to the enamel fracture; in cases the bracketfailed at the enamel–composite interface completely orpartially (scores 0, 1, 2) as suggested by Artun and Bergland.This study is a clinically attempt to evaluate the failure–bracket number and the bracket failure sites, for three orthodonticcomposite systems, which were two paste (Concise);nomix (Right ON) and light cure (Transbond). These adhesiveswere used in bonding a stainless steel brackets to the teethof adhesive system.The number of the failed brackets through 18 months oftreatment were recorded and the site of the failed bracketswere observed by magnifying lens (10×) and recorded accordingto the Artun and Bergland index.The results showed that there were no significant differencesof failed brackets at p < 0.05 and 0.01 levels amongthese three composite systems, but the Concise adhesive hadthe least failure–brackets.The failure sites of the failed brackets for the three bondingsystems were occurred at scores 2 and 3, while the Concisesystem had the highest percentage of score 3 site (80%)(composite bracket interface).