The results of this in-vitro investigation on cementing brackets with different glass ionomer cements show that Fuji I is the only cement which could be used as an alternative for bonding metal brackets to enamel. Although present clinical use seems to be quite satisfying, further in-vivo research will be necessary to prove and confirm these findings. All other investigated glass ionomer materials demonstrated a significant loss of shear bond strength after various temperature changes and therefore do not seem to be indicated for clinical use. At the moment research and development of the various glass ionomer cements are so intensified that it is almost impossible to give general statements or recommendations on different brands for cementing brackets to enamel.