ABSTRACT

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 + 103 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 serued 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. The tensile bond strength of bonding resin to the etched enamel surfaces were calculated for all teeth and the data analyzed by means of the biostatistical analysis system. The result of this in vitro study, the application of topical fluoride solution after pre-etching were insignificantly found to be an adverse effect on bond strength.