Aerotolerance of an endodontic pathogen.

Area of Science:

• Endodontics
• Microbiology
• Dental Materials Science

Background:

• Obligate anaerobic bacteria are a primary cause of endodontic infections.
• Effective disinfection of the root canal system is crucial for successful endodontic treatment.
• Porphyromonas endodontalis is a significant anaerobic pathogen implicated in endodontic disease.

Purpose of the Study:

• To evaluate the efficacy of atmospheric air and 3% hydrogen peroxide in eliminating Porphyromonas endodontalis from root canals.
• To determine the time required for these agents to achieve bacterial kill.

Main Methods:

• Twenty-five human teeth with single root canals were contaminated with Porphyromonas endodontalis.
• Teeth were divided into five groups: air exposure (5 and 45 minutes), 3% hydrogen peroxide exposure (5 and 45 minutes), and an anaerobic control group.
• Bacterial viability was assessed after exposure.

Main Results:

• Atmospheric air exposure for up to 45 minutes did not eliminate Porphyromonas endodontalis.
• All groups exposed to 3% hydrogen peroxide demonstrated complete eradication of bacterial growth.
• Control teeth maintained viability of Porphyromonas endodontalis.

Conclusions:

• Atmospheric air is ineffective for disinfecting root canals contaminated with Porphyromonas endodontalis.
• 3% hydrogen peroxide is a highly effective disinfectant against Porphyromonas endodontalis in root canals.
• Further research may explore optimal concentrations and exposure times for hydrogen peroxide in endodontic therapy.