effect of quaternary ammonium salt on shear bond strength of orthodontic brackets to enamel

Objectives: this study sought to assess the effect of quaternary ammonium salt (qas) on shear bond strength of orthodontic brackets to enamel. materials and methods: in this in vitro experimental study, 0, 10, 20 and 30% concentrations of qas were added to transbond xt primer. brackets were bonded to 60 premolar teeth using the afore-mentioned adhesive mixtures, and the shear bond strength of the four groups (n=15) was measured using a universal testing machine. after debonding, the adhesive remnant index (ari) score was determined under a stereomicroscope. data were analyzed using one-way anova. results: the mean and standard deviation of shear bond strength of the control and 10%, 20% and 30% groups were 23.54±6.31, 21.81±2.82, 20.83±8.35 and 22.91±5.66 mpa, respectively. no significant difference was noted in shear bond strength of the groups (p=0.83). study groups were not different in terms of ari scores (p=0.80). conclusions: the results showed that addition of qas to transbond xt primer had no adverse effect on shear bond strength of orthodontic brackets.