AUTHOR(S): Said Karabekiroğlu, Işın Akdemir and Fatma Betül Kahraman

ABSTRACT:The aim of this in vitro study was to investigate the effect of CPP-ACPF paste and fluorid varnish (5% NaF) application before/after acid etching on the bracket-enamel shear bond strength (SBS) of a total etch system and to compare them one self-etch system. 160 teeth were divided into eight equal groups (20teeth/group), two control and six test groups: 1-Control etch, 2-CPP-ACPF before etch, 3-CPP-ACPF after etch, 4-%5NaF before etch, 5-%5NaF after etch; 6-Control-selfetch, 7-CPP-ACPF before self-etch, 8-%5NaF before self-etch. Debonding forces will be measured with a universal testing machine at a crosshead speed of 0.5 mm/min. Enamel surface treatment with %5NaF before acid-etching significantly decreased SBS compared to the control and to its application before acid-etching both etch and self-etch adhesives (p<0.05). Brackets SBS was not changed significantly when CPP-ACPF was applied after/before acid-etching. Significantly decreased SBS mean was obtained when %5NaF application was made before etching

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