Dual-Light Photodynamic Therapy Effectively Eliminates Streptococcus Oralis Biofilms

Area of Science:

• Oral microbiology
• Photodynamic therapy
• Cancer treatment complications

Background:

• Oral mucositis is a common side effect of cancer therapy, increasing infection risk.
• Viridans streptococci, part of oral flora, can cause bloodstream infections in neutropenic patients.
• Previous research demonstrated the antibacterial efficacy of dual-light therapy.

Purpose of the Study:

• To evaluate the antibacterial efficacy of dual-light therapy against Streptococcus oralis biofilms.
• To investigate the impact of varying light energy ratios within dual-light therapy on antibacterial potential.

Main Methods:

• Cultured four-day Streptococcus oralis biofilms were subjected to dual-light therapy.
• Total radiant exposure was maintained at 100 J/cm² while altering the relative intensities of aBL and aPDT.
• Antibacterial effects were assessed across different light energy combinations.

Main Results:

• Dual-light therapy demonstrated significant antibacterial activity against S. oralis biofilms.
• All tested combinations of antibacterial blue light (aBL) and indocyanine green photodynamic therapy (aPDT) showed efficacy.
• The study confirmed the effectiveness of dual-light in reducing bacterial load.

Conclusions:

• Dual-light therapy is a promising and effective disinfectant for Streptococcus oralis biofilms.
• This approach offers a potential strategy for managing oral infections in immunocompromised patients.
• Further research can optimize dual-light parameters for clinical application.