In vitro Comparison of Bracket Adhesion with Two Dental Enamel Deproteinization Techniques

Bracket adhesion is important for the success of orthodontic treatment, it is therefore necessary to evaluate some products that can improve their quality. The use of deproteinizing agents before acid etching may contribute to increasing orthodontic tensile strength. To com- pare in vitro bracket adhesion using 5.25 % sodium hypochlorite and papain gel as tooth enamel deproteinization techniques.The research was experimental in vitro, evaluating 26 premolars randomly divided into two groups, 13 received 5.25 % sodium hypochlorite and 13 papain gel before acid etching. The brackets were cemented with an orthodontic adhesive system (Transbond XT - 3M). To perform the shear test, a multipurpose digital force measurement equipment was used. Adhesion comparison was performed using the Student's T statistic test. No statistically significant differences were found between the average shear strength effect of the two techniques studied (P=0.935). The mean resistance to shearing force in bracket adhesion, after tooth enamel deproteinization with 5.25 % sodium hypochlorite, was 12.05 ± 1.16 MPa, and in the papain gel group it was 12.18 ± 1.31 MPa. he previous deproteinization of the enamel surface to adhere brackets, provides similar resistance to in vitro shearing both when using 5.25 % NaClO and papain gel.