A COMPARATIVE EVALUATION OF SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS BONDED AFTER CONDITIONING OF ENAMEL WITH 5.25% SODIUM HYPOCHLORITE AND 10% PAPAIN GEL , An In-vitro study

ABSTRACT

objectives : The objective of this research was to evaluate the effect of conditioning the enamel surface with 10 % papain gel and 5.25 % sodium hypochlorite on the shear bond strength of orthodontic brackets and also to correlate it with the conventional bonding mechanism by means of a Universal Testing Machine. Methodology:  90 extracted human premolarswere utilized and divided into three groups: In the group 1, treatment with 5.25% sodium hypochlorite for 60 seconds on enamel surface followed by etchant and primer application. group 2, treatment with 10% Papain gel for 40 seconds followed by etching and primer application.Ingroup 3,etching followed  primer application . Universal testing machine was used to record the shear bond strength of the orthodontic brackets.Results: 5.25% sodium hypochlorite(15.10±2.66) and 10% papain gel (15.66±2.83)     treatment on enamel prior to acid etching when compared to the control group (12.82±2.03) increased the shear bond  strength with a statistically significant difference between them  ( p=0.002, p<0.001). The experimental groups, sodium hypochlorite (15.10±2.66)  and papain gel(15.66 ±2.83)   group were comparable but did not show any statistically significant difference between them ( p=0.665)

Conclusion :Shear bond strength of orthodontic brackets can be significantly increased if the enamel is deproteinized with 5.25% NaOCl and 10% papain gel before acid etching with 37% phosphoric acid compared to the conventional bonding technique. Deproteinizing enamel can be considered a cost effective ally to increasing bond strength of orthodontic brackets and thereby reducing the duration of orthodontic treatment.