Evaluation of Chlorhexidine Application on Shear Bond Strength in Different Brackets and Different Etching Techniques in Vitro Study

Abstract

Purpose of this study was to assess the etch enamel surface of teeth, affect “shear bond strength” in application chlorhexidine and the “adhesive remnant index” scores. Material and Method: Eighty premolar teeth half of the samples (Groups A,B/metal bracket.C,D/ceramic bracket) were conditioned with using 37% orthophosphoric acid gel (SDI, California,USA)for 30s washed/ dried. The other half of the samples (Groups E,F/metal bracket.G,H/ceramic bracket) were conditioned with Er:CrYSGG laser system, Power: 2W, Wave length: 2,780,energy: 250 mJ, Pulse duration: 140 μs Frequency: 20 Hz.,Cooling system: 90%:%80air-water spray, Mode of application: swiping motion (Waterlase,1 plus from Biolase USA) and then washed and dried. The groups(B,D,F,H) sealant was applied with CHX varnish. Results: statistical analyses presented that SBSs of laser radiation were significantly difference than that of acid etching. Conclusions: laser etched resulted the bond Strength accepted clinically in the metal, ceramic and could be an substitute to the acid etching.CHX sealant not significant affect in orthophosphoric acid etching but more weaker in laser etching.