An in vivo investigation into the use of resin-modified glass poly(alkenoate) cements as orthodontic bonding agents

The aim of this study was to investigate the in vivo bonding of orthodontic brackets using two resin-modified glass poly(alkenoate) cements and to com pare them with a conventional light-cured diacrylate bonding agent. Twenty consecutive patients attending for bond up appointments took part in this randomized cross-mouth control study. Alternate quadrants were bonded with either Fuji Ortho LC or 3M Multi-Cure. Transbond [Adhesive Pre-Coated Brackets (APC (TM))] acted as the control in the other quadrants. Failed b rackets were rebonded with the same material. Bond failure rates were colle cted over a 1-year period. The bond failure rates over 1 year were 7.2 per cent for Transbond (APC), 5 .9 per cent for 3M Multi-Cure, and 5.8 per cent for Fuji Ortho LC. Statisti cally, there was no significant difference between the bond failure rates o f the materials and there was no effect of time. This clinical investigation confirmed the suitability of the resin-modified glass poly(alkenoate) cements under test as orthodontic bonding agents.