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In Vitro Efficacy of Antimicrobial Photodynamic Therapy With Phycocyanin and Diode Laser for the Reduction of Porphyromonas Gingivalis Publisher



Etemadi A1, 2 ; Azizi A3 ; Pourhajibagher M4 ; Chiniforush N5
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Authors Affiliations
  1. 1. Department of Periodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
  2. 2. Laser Research Center of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
  4. 4. Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran

Source: Journal of Lasers in Medical Sciences Published:2022


Abstract

Introduction: Implant surface disinfection is the most difficult phases in treatment of periimplantitis. This study sought to assess the efficacy of antimicrobial photodynamic therapy (aPDT) with phycocyanin and diode laser for the reduction of Porphyromonas gingivalis. Methods: In this in vitro, experimental study, first the minimum inhibitory concentration (MIC) of phycocyanin, the sub-lethal exposure time of the diode laser, and the sub-lethal dose of aPDT were determined. The wells containing P. gingivalis suspension were randomly divided into three experimental groups for exposure to ½ MIC phycocyanin for 5 minutes, minimum lethal dose of diode laser (635 nm, 4 minutes), and aPDT with phycocyanin and diode laser. The positive control group was exposed to 0.2% chlorhexidine (CHX) for 5 minutes, and the negative control group received no treatment. The colony count was calculated in the five groups and compared using one-way ANOVA and t test. Results: aPDT with a diode laser (635 nm, 4 minutes) and 125 μg/mL phycocyanin caused a significantly greater reduction in P. gingivalis count (mean reduction of 44.24%) compared with other groups (P < 0.0001). Minimum and maximum colony counts were noted in 0.2% CHX and negative control groups respectively. The reduction in the colony count was significant in all experimental groups, compared with the control group (P < 0.0001). Conclusion: aPDT with 635-nm diode laser and phycocyanin can significantly decrease P. gingivalis count in vitro. Considering the conservative nature of this modality, it may be used for the decontamination of peri-implant © 2022, Journal of Lasers in Medical Sciences.All Rights Reserved.
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