Clinical acceptability of two self-etch adhesive resins fo. The bonding of orthodontic brackets to enamel

Objective: To determine whether two self-adhesive resin cements, Clearfil SA and RelyX, can be used to successfully bond orthodontic brackets to enamel. Materials and methods: Seventy extracted premolars were custom mounted, cleaned and randomly divided into three groups. In group 1 (control), orthodontic brackets were bonded to 25 premolars usin. The Transbond Plus and Transbond XT two step adhesive systerm adhesive. In group 2, brackets were bonded to 25 premolars using Clearfil SA. In group 3, brackets were bonded to 20 premolars using RelyX. The brackets were debonded using a universal testing machine and shear bond strengths recorded. After debonding, each tooth was examined under 20× magnification to evaluat. The residual adhesive remaining. An ANOVA with Duncan's Multiple Range Test was used to determine whethe. There were significant differences in shear bond strength betwee. The groups. A Kruskal-Wallis Test and a Bonferroni multiple comparison procedure were used to compar. The bond failure modes (adhesive remnant index scores) betwee. The groups. Results. The mean shear bond strengths fo. The brackets bonded using Clearfil SA and RelyX were 5.930±1.840 and 3.334±1.953 MPa, respectively. Both were significantly lower than that fo. The brackets bonded using Transbond (7.875±3.611 MPa). Both self-etch adhesive resin cement groups showed a greater incidence of bracket failure a. The enamel/ adhesive interface whil. The Transbond group showed a higher incidence a. The bracket/adhesive interface. Conclusions. The shear bond strengths o. The self-etch adhesive resin cements may be inadequate to successfully bond orthodontic brackets to enamel.