Endodontic photodynamic therapy ex vivo

Area of Science:

• Endodontics
• Microbiology
• Biomedical Engineering

Background:

• Infected root canals pose a significant challenge in endodontic therapy.
• Evaluating adjunctive antimicrobial strategies is crucial for effective treatment.

Purpose of the Study:

• To assess the antimicrobial efficacy of photodynamic therapy (PDT) as an adjunct to chemomechanical debridement (CMD) in infected human teeth.
• To compare bacterial reduction in root canals treated with CMD alone versus CMD combined with PDT.

Main Methods:

• Ex vivo study involving 52 infected human teeth.
• Root canals underwent either CMD with 6% NaOCl or CMD followed by PDT (methylene blue photosensitizer and red light).
• Bacterial load quantified using colony-forming units (CFUs) and species identification via checkerboard DNA-DNA hybridization.

Main Results:

• Photodynamic therapy (PDT) significantly improved bacterial reduction compared to chemomechanical debridement (CMD) alone (P = .026).
• 86.5% of canals treated with CMD+PDT showed no CFUs, versus 49% with CMD alone.
• PDT also reduced bacterial detection within dentinal tubules (51.7% vs 77.3%).

Conclusions:

• Photodynamic therapy (PDT) is an effective adjunct to chemomechanical debridement (CMD) for reducing residual bacteria in root canal systems.
• Further technical refinements could enhance PDT's role in endodontic disinfection.