Abstract
August 2005, Vol. 76, No. 8, Pages 1275-1281 , DOI
10.1902/jop.2005.76.8.1275
(doi:10.1902/jop.2005.76.8.1275)
Comparative
Study Between the Effects of Photodynamic Therapy and Conventional Therapy
on Microbial Reduction in Ligature-Induced Peri-Implantitis in Dogs
Ricardo R.A. Hayek
Laser and Applications
Center, Institute of Nuclear and Energetic Research, São Paulo, Brazil.
Ney S. Araújo
Department of
Pathology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Marco A. Gioso
Department of Surgery,
Faculty of Veterinary Medicine and Zootechnics, University of São Paulo.
Jonathan Ferreira
Department of Surgery,
Faculty of Veterinary Medicine and Zootechnics, University of São Paulo.
Carlos A. Baptista-Sobrinho
Brazilian
Army, Osasco, São Paulo, Brazil.
Aécio
M. Yamada Jr.
Laser and Applications
Center, Institute of Nuclear and Energetic Research, São Paulo, Brazil.
Dr. Martha
S. Ribeiro
Laser and Applications
Center, Institute of Nuclear and Energetic Research, São Paulo, Brazil.
Background: Progressive peri-implant bone losses, which are
accompanied by inflammatory lesions in the soft tissues, are referred to as
peri-implantitis. The aim of this study was to compare the effects of
photodynamic therapy (PDT) and conventional technique on microbial
reduction in ligature-induced peri-implantitis in dogs.
Methods: Eighteen third premolars from nine Labrador
retriever dogs were extracted and the implants were submerged. After
osseointegration, peri-implantitis was induced. After 4 months, ligature
was removed and natural bacterial plaque was allowed to form for another 4
months. The animals were then randomly divided into two groups. In the
conventional group, they were treated using mucoperiosteal flaps for
scaling the implant surface and chlorexidine (conventional) irrigation. In
the PDT group, only mucoperiosteal scaling was carried out before
photodynamic therapy. Inside the peri-implant pocket, a paste-based azulene
photosensitizer was placed and then a GaAlAs low-power laser (λ =
660 nm, P = 40 mW, E = 7.2 J for 3 minutes) was used. Microbiological
samples were obtained before and immediately after treatment. Before
treatment, one implant was removed and analyzed by scanning electron
microscopy to validate the contamination.
Results: The results of this study showed that Prevotella sp., Fusobacterium sp., and S.
Beta-haemolyticus were significantly reduced for both groups.
After treatment, no significant differences were observed between the
groups.
Conclusion: These findings suggest that photodynamic
therapy is a non-invasive method that could be used to reduce
microorganisms in peri-implantitis. J
Periodontol 2005;76:1275-1281.
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