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http://dx.doi.org/10.5051/jpis.2015.45.2.38

The effect of photodynamic therapy on Aggregatibacter actinomycetemcomitans attached to surface-modified titanium  

Cho, Kyungwon (Department of Periodontology, Research Institute for Oral Sciences, College of Dentistry, Gangneung-Wonju National University)
Lee, Si Young (Department of Oral Microbiology, Research Institute for Oral Sciences, College of Dentistry, Gangneung-Wonju National University)
Chang, Beom-Seok (Department of Periodontology, Research Institute for Oral Sciences, College of Dentistry, Gangneung-Wonju National University)
Um, Heung-Sik (Department of Periodontology, Research Institute for Oral Sciences, College of Dentistry, Gangneung-Wonju National University)
Lee, Jae-Kwan (Department of Periodontology, Research Institute for Oral Sciences, College of Dentistry, Gangneung-Wonju National University)
Publication Information
Journal of Periodontal and Implant Science / v.45, no.2, 2015 , pp. 38-45 More about this Journal
Abstract
Purpose: The purpose of this study was to evaluate the effect of photodynamic therapy (PDT) using erythrosine and a green light emitting diode (LED) light source on biofilms of Aggregatibacter actinomycetemcomitans attached to resorbable blasted media (RBM) and sandblasted, large-grit, acid-etched (SLA) titanium surfaces in vitro. Methods: RBM and SLA disks were subdivided into four groups, including one control group and three test groups (referred to as E0, E30, E60), in order to evaluate the effect of PDT on each surface. The E0 group was put into $500{\mu}L$ of $20{\mu}M$ erythrosine for 60 seconds without irradiation, the E30 group was put into erythrosine for 60 seconds and was then irradiated with a LED for 30 seconds, and the E60 group was put into erythrosine for 60 seconds and then irradiated with a LED for 60 seconds. After PDT, sonication was performed in order to detach the bacteria, the plates were incubated under anaerobic conditions on brucella blood agar plates for 72 hours at $37^{\circ}C$, and the number of colony-forming units (CFUs) was determined. Results: Significant differences were found between the control group and the E30 and E60 groups (P<0.05). A significantly lower quantity of CFU/mL was found in the E30 and E60 groups on both titanium disk surfaces. In confocal scanning laser microscopy images, increased bacterial death was observed when disks were irradiated for a longer period of time. Conclusions: These findings suggest that PDT using erythrosine and a green LED is effective in reducing the viability of A. actinomycetemcomitans attached to surface-modified titanium in vitro.
Keywords
Bacterial viability; Erythrosine; Photodynamic therapy; Titanium;
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