[Effect of topical fluoride treatment on the tensile bond strength of an orthodontic bonding resin].

A study was undertaken to determine the effect of an acidic phosphate fluoride solution (% 2 NaF in 0.1 M H3 PO4, PH3) and a basic phosphate fluoride solution (10(-2) M Na3 PO4 + 10(3) ppm F-, PH 8) on the tensile bond strength of an orthodontic bonding resin (3 M Consise System) soon after application of the pre-bonding etch. 24 premolars were evenly divided into three groups and % 37 orthophosphoric acid was applied to all enamel surfaces for 3 minute to simulate the pre-bonding etch; on the first group of teeth which served as control, brackets were bonded directly to etched surfaces with a Bis-GMA direct bonding adhesive; second group of teeth were received a 1.5 minute application of acidic phosphate fluoride solution and the brackets were bonded directly; third group of teeth were also received a 2.5 minute application of basic phosphate fluoride solution and brackets were bonded directly too.