Novel Internal Bleaching Techniques After Regenerative Endodontic Procedures (an In Vitro Study).

To evaluate the addition of sweet potato or pineapple extracts to hydrogen peroxide for internal bleaching following regenerative endodontic procedures. In this in vitro study, 24 incisors were discolored with triple antibiotic paste and assigned to three groups. Group I (control): teeth received 0.5 mL of 30% hydrogen peroxide. Group II: teeth received 0.5 mL of 30% hydrogen peroxide and 1 mL of sweet potato extract (8 g/mL). Group III: teeth received 0.5 mL of 30% hydrogen peroxide and 1 mL of pineapple extract (8 g/mL). Spectrophotometric measurements were obtained after discoloration and after bleaching for 1, 2, 3, and 4 weeks. ΔE00 was calculated using an Excel spreadsheet implementing the CIEDE2000 formula. Repeated measures analysis of variance, one-way ANOVA, and Bonferroni post hoc tests were used (p < 0.05). Highest color variation at first, third, and fourth weeks was statistically significant when hydrogen peroxide and sweet potato extract were combined (p < 0.05). Hydrogen peroxide with pineapple extract demonstrated color shift with no statistically significant differences compared to hydrogen peroxide alone (p > 0.05). Intracoronal bleaching efficacy of hydrogen peroxide was enhanced by the addition of sweet potato extract, and three sessions are recommended for a satisfactory outcome. Combining hydrogen peroxide with sweet potato extract can be considered a more conservative biocompatible approach compared to the conventional protocol for treating discoloration following triple antibiotic paste.