Abstract
Aim: to assess the effect of three different remineralizing agents on the shear bond strength (SBS) of orthodontic brackets bonded to remineralized enamel.
Materials and Methods: 32 human premolars were allocated into four groups (n=8), covered with nail varnish except labial enamel left uncoated, demineralization protocol was performed for all groups, then remineralizing regime were applied as follow (group I) demineralization only, (group II) casein phosphopeptide amorphous calcium phosphate [CPP-ACP], (group III) Novamin, (group IV) Self-assembling peptide P11-4 (SAP-P11-4). After bracket bonding, shear bond strength was assessed. Adhesive remnant index (ARI) was detected using stereomicroscope. Kruskal-wallis test followed by Dunn's post hoc test (P<0.05) was carried out for SBS, Shapiro-Wilk ‘test and Levene's test were used to test normality and homogeneity respectively and on-way ANOVA test (P<0.05) for ARI evaluation.
Results: SAP P11-4 group showed significant low SBS results than the other groups while CPP-ACP and Novamin group showed significantly higher bond strength than the other two groups.
Conclusion. Pretreatment of demineralized enamel surface with CPP-ACP and Novamin before bracket cementation significantly increase shear bond strength.