Dissolution of bovine pulp tissue by endodontic solutions

Area of Science:

• Biomaterials Science
• Endodontics
• Biochemistry

Background:

• Root canal therapy requires effective irrigation solutions to remove pulpal tissue and debris.
• Understanding the solvent capacity of different irrigants is crucial for optimizing endodontic procedures.
• Sodium hypochlorite (NaOCl) is a commonly used irrigant, but its efficacy on organic tissue requires further quantification.

Purpose of the Study:

• To evaluate and compare the tissue-dissolving capacity of various root canal irrigating solutions.
• To determine the optimal concentration of sodium hypochlorite (NaOCl) for pulpal tissue dissolution.
• To assess the impact of irrigants on hydroxyproline (HYP) and phosphate levels in pulpal tissue.

Main Methods:

• Pulpal tissue samples were incubated with different root canal irrigating solutions at 37°C for 10 minutes.
• Assays were performed to measure hydroxyproline (HYP) and total phosphate in dissolved material.
• Insoluble residue was analyzed for HYP and dry weight to quantify tissue dissolution.

Main Results:

• Sodium hypochlorite (NaOCl) at 5% and 2.5% concentrations demonstrated the highest solvent capacity, indicated by significant loss of HYP and tissue weight.
• A 0.5% concentration of NaOCl showed markedly reduced effectiveness in dissolving pulpal tissue.
• Other tested solutions were significantly less effective than NaOCl in dissolving soft tissue, although demineralizing solutions increased phosphate release.

Conclusions:

• Sodium hypochlorite (NaOCl) is a superior irrigant for pulpal tissue dissolution in root canal therapy compared to other tested solutions.
• Optimal efficacy of NaOCl for tissue dissolution is achieved at concentrations of 5% and 2.5%.
• The absence of HYP in NaOCl extracts suggests its decomposition, highlighting its potent organic tissue-dissolving action.