Comparing The Effect Of Primary Enamel Deproteinization Before And After Acid Etching On The Shear Bond Strength - An In-Vitro Study

Objective: The purpose of this in vitro investigation was to assess the effect of deproteinization before and after acid etching on the shear bond strength when primary enamel is bonded to composite resin. Materials and Methods: Forty-five enamel specimens were randomly distributed into 3 groups (15 each) according to the surface treatment, in Group I: enamel is acid etched only, in Group II: specimens are acid etched then exposed to 1 minute NaOCl deproteinizationin, and in Group III enamel specimens were deproteinized then acid etched. An adhesive was applied (Adper Single Bond universal) was applied, nanohybrid composite (Z350) was placed using Tygon catheter. All the samples were then subjected to the SBS test using a universal testing machine. Data analysis was performed using a one-way ANOVA test followed by the Tukey test. P-values less than 0.05 were considered significant. Results: Comparison of the mean SBS between the groups showed a statistically significant difference between all groups, Group II displayed the highest mean value followed by Group III, while Group I where enamel was only etched with phosphoric acid showed the least mean value. Conclusions: Deproteinizing the enamel of primary teeth with NaOCl before or after acid etching showed a significant increasein the SBS compared to the application of acid etch alone, moreover, deproteinization after acid etching yielded the highest SBS values.