The aim of this study was to test under thermo stress the effect of various adhesives on the bonding strength of brackets with a new retention mechanism in comparison to brackets with a conventional retentive basis. In the test 17 different adhesives and metal brackets with two different retention mechanisms were used. One group of metal brackets was coated by means of the Kulzer silane coating procedure and the other had a mesh basis. The latter served as the control group. Both were held in place by adhesives and their bonding strength tested. The following conclusions were drawn: 1. Both of the bracket types demonstrated the highest bonding strength with the mixed composites (paste/paste). 2. The silane coated bracket bases demonstrated altogether higher bonding strength than the mesh brackets, but the difference with the light-cured and the epoxy-adhesives was only statistically significant.
