Influence of pH changes on chlorine-containing endodontic irrigating solutions

Antimicrobial efficacy of disinfectants is known to be influenced by chemical properties. In water disinfection, pH has been linked to chlorine-based agents' performance. However, the specific impact of pH on endodontic solutions remains unclear. Prior studies have explored hypochlorous acid's role in disinfection, but its application in root canal treatments is less established. Researchers have examined sodium hypochlorite's pH-dependent behavior, but its broader implications in endodontic irrigation are not fully understood. No prior work has resolved how pH changes affect multiple chlorine-based solutions in this context. This uncertainty drives the need for a focused review. The gap in pH-specific efficacy data for endodontic irrigants motivated this synthesis. Understanding pH's role could refine clinical protocols. This paper addresses that gap by reviewing available evidence.

This paper aimed to analyze how pH influences the performance of chlorine-based endodontic solutions. The specific problem is the lack of clarity on how pH affects antimicrobial and tissue dissolution properties of these solutions. The motivation stems from the known pH-dependent behavior of chlorine disinfectants in other fields. The review sought to clarify whether pH adjustments could optimize root canal irrigation. The authors focused on sodium hypochlorite, superoxidized water, and sodium dichloroisocyanurate. They wanted to determine if pH changes could enhance antimicrobial activity while preserving tissue dissolution. The study also aimed to compare these solutions' cleaning efficacy. This approach helps guide clinical use of pH-adjusted solutions.

The authors conducted a literature review using electronic and manual search strategies. They included English-language articles published through 2010. Search terms focused on root canal irrigants and specific chlorine compounds. The inclusion criteria required studies comparing pH-adjusted solutions. A total of 1304 articles were identified initially. The authors applied strict selection criteria to narrow down to 20 relevant publications. The selected articles covered sodium hypochlorite, superoxidized water, and sodium dichloroisocyanurate. The review focused on antimicrobial efficacy, tissue dissolution, and cleaning properties. The synthesis of findings was based on the selected literature's data.

The literature suggested that lowering sodium hypochlorite's pH to 6-7.5 improved antimicrobial action. Superoxidized water showed lower antimicrobial efficacy compared to pH-adjusted sodium hypochlorite. Tissue dissolution activity of sodium hypochlorite decreased at pH 6-7.5. Sodium dichloroisocyanurate and superoxidized water had minimal tissue dissolution. The reviewed solutions demonstrated some cleaning efficacy. However, they required combination with chelating or detergent agents. The findings indicate pH's significant role in solution performance. These results highlight the need for pH consideration in clinical use.

The authors propose that pH adjustments can influence chlorine-based solutions' antimicrobial and tissue dissolution properties. Sodium hypochlorite's efficacy improved at lower pH, but tissue dissolution decreased. Superoxidized water and sodium dichloroisocyanurate showed limited tissue dissolution. The authors suggest that these solutions may require supplementary agents for optimal cleaning. They propose that pH-adjusted sodium hypochlorite could be more effective in endodontic use. The findings suggest that pH is a critical factor in solution performance. The authors recommend further research to confirm these observations. These conclusions are based on the reviewed literature's data.