The aim of this study was to compare the bonding strength of orthodontic brackets bonded to fluorotic and non fluorotic normal teeth. Sixty extracted human mandibular premolars (30 fluorotic and 30 non[1]fluorotic) were collected. The first control group (CG) was the non-fluorotic teeth while the second group (FG) the teeth were fluorotic. Orthodontic adhesive (Transbond XT) with self-etching primer (Transbond Plus) were used to bond 60 metal brackets. Shearing strength was applied at the bracket body to debond the bracket using Testometric Machine. Data were then analyzed with Independent Samples t-test (α=.05).Modified Adhesive Remnant Index -ARI was used to determine the mode of bond failure. The mean shearing bond strength (SD) was 8.33±3.2 MPa in the study group and 10.17±3.1 MPa in the control group. Although it was higher than the minimum required bonding strength, Independent Samples t-test revealed that bonding strength in the fluorotic teeth group was statistically lower than that in the non fluorotic teeth group at p=0.027. Chi-squared test showed that adhesive remnant index (ARI) was statistically higher in the non fluorotic teeth. Light cured composite with self-etching primer produce clinically accepted bonding strength when used to bond metal brackets to fluorotic teeth.
