Effectiveness of Ascorbic Acid in Eliminating Orange-Brown Precipitate from Root Canals

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Tunç B., Özçelik İ., Özcan Diker C., Er K.

AYDIN DENTAL JOURNAL, cilt.12, sa.1, ss.1-11, 2026 (Hakemli Dergi)

Özet

Objectives: To determine the effect of ascorbic acid (AA) on the removal of orange-brown precipitate (PCA) formed by the interaction of sodium hypochlorite (SH) and chlorhexidine (CHX) during root canal treatment.
Materials and Method: PCA was obtained by mixing 1.25 mL of 2.5% SH and 1.25 mL of 2% CHX in glass tubes. Different concentrations of AA ranging from 5-30% were prepared and the effect of these solutions on PCA solubility was determined by gravimetric method. In addition, a deep eutectic solvent system (DES) was obtained by mixing certain mole ratios of AA, glycerin and deionized water at 70 °C for 1 h and cooling to room temperature at the end of the time. The performance of DES on the solubility of PCA was evaluated using the same method.
Results: In control group prepared with a certain volume of physiological saline applied to PCA at constant volume at 25 °C, it was determined that PCA dissolved approximately 27%. When a certain volume of AA was applied to the PCA the same way, it was determined that this rate increased to approximately 55% with the increase in the concentration of AA. In addition, a solubility of over 80% was achieved in PCA to which a certain volume of DES was applied.
Conclusion: High concentrations of AA can be used as an irrigating solvent for the removal of PCA and it was also found that DES system has the potential to be a more effective solvent for PCA solubilization compared to AA.