TENSILE BOND STRENGTH OF ORTHODONTIC BRACKETS BONDED WITH A FLUORIDE-RELEASING LIGHT-CURING ADHESIVE - AN IN-VITRO COMPARATIVE-STUDY

A light-curing, fluoride-releasing adhesive (VP 862, Vivadent, Liechte nstein) for bonding of brackets has been produced for inhibition of wh ite spot lesions during orthodontic treatment. The tensile bond streng th after 24 hours and 6 months was investigated and compared with two other light-curing adhesives (Transbond, 3M Corp., Monrovia, Calif., a nd Heliosit-Orthodontic, Vivadent, Liechtenstein) and two chemical-cur ing adhesives (Concise, 3M, Monrovia Calif., and Saga Bond, Saga Ortho dontics, Kongsvinger, Norway). All adhesives produced adequate strengt h to be recommended for clinical use. The light-curing adhesives produ ced slightly lower bond strengths after 24 hours and 6 months, except Transbond, which showed an increase in bond strength in this period ap proaching the two chemical adhesives.