Objective. This study aimed to evaluate the effects of a new self-etching primer (SEP) on the shear bond strength (SBS) of stainless steel orthodontic brackets.
Methods. A total of 30 freshly extracted human bicuspids were randomly collected and divided into two groups (n = 15). In group I (control), the enamel was
conditioned with Transbond Plus SEP; whereas in group II (experimental), the enamel was conditioned with Bond Force. In both groups the stainless steel brackets were bonded with Transbond XT. The samples were stored at 37 °C, for 24 h. After which, the SBS was tested (0.5 mm/min). The scoring of adhesive remnant index (ARI) was also recorded. Additionally, the effect of enamel conditioners was observed under a scanning electron microscope (SEM). Results. There was no significant differences between both groups (I: 22.0 ± 3.9 MPa and II: 20.0 ± 3.6 MPa); nevertheless, the mean value of SBS yielded by the experimental group was slightly lower. The scores of the ARI did not show significant differences either. The SEM images of the enamel surfaces conditioned with both SEP systems showed interesting etch patterns. Conclusions. The new SEP did not significantly affect the SBS of stainless steel brackets, neither the ARI. Thus, the use of this new SEP can be an alternative for bonding orthodontic brackets. However, its application requires longer time than the other SEP.
(Rev Esp Ortod. 2008;38(3):207-212)