The purpose of this study was to evaluate the shear-peel bond strengths of orthodontic attachments bonded to enamel surfaces under varying conditions. A light-cured composite adhesive was compared to a cyanoacrylate adhesive and a composite hybrid adhesive. The shear-peel bond strengths in this study are stated as 24 hours vs. 6 months and were as follows: Transbond(tm) XT/dry (10.57 +- 2.83 MPa vs 12.23 +- 3.14 MPa), Assure(tm)/dry (6.93 +- 2.2 MPa vs 8.18 +- 1.39 MPa), Smartbond(R)/dry (3.91 +- 1.17 MPa vs 4.11 +- 1.96 MPa), Transbond(tm) XT/moist (0.14 +- 0.31 MPa vs 0 +- 0 MPa), Assure(tm)/moist (6.03 +- 1.77 MPa vs 6.86 +- 2.81 MPa), and Smartbond(R)/moist (3.22 +- 0.52 MPa vs 2.4 +- 0.96 MPa). There was a statistically significant difference (p < 0.05) between (1) the different adhesives (2) the dry and moist conditions of Transbond(tm) XT. There was no statistically significant difference (p > 0.05) between (1) the dry and moist conditions of Assure(tm) and Smartbond(R) (2) the 24 hour and 6 month time frame for all adhesives. (Abstract shortened by UMI.)