Effect of Ultraviolet Irradiation of the Implant Surface on Progression of Periimplantitis—A Pilot Study in Dogs. Issue 1 (February 2016) - Ishii, Kouken
Abstract : Objective: The objective of this study was to investigate morphologically the progression of periimplantitis around an ultraviolet (UV)-light-irradiated implant in dogs. Materials and Methods: Pure titanium implants (3.3 mm in diameter and 8 mm long) were placed into dog jawbone bilaterally. Implants on one side were irradiated with UV light for 15 minutes using a photodevice immediately before placement (UV group), whereas those on the other side were not irradiated (non-UV group). Osseointegration was confirmed 90 days after implant placement by radiography. Experimental periimplantitis was induced by the application of dental floss over 90 days. Clinical and radiographic examination and micro–computed tomography (micro-CT) were performed after 90 and 180 days, and bone resorption was measured. The bone–implant interface in tissue sections was examined by light microscopy. Results: Bone resorption around the UV-irradiated implant was less pronounced than around the non–UV-irradiated implant in the ligature-induced periimplantitis model. Tissue section images revealed no contact and partial destruction at the bone–implant interface. Conclusion: Within the limitations of this preliminary investigation, it is suggested that UV-light-irradiated implants suppress spontaneous progression of periimplantitis.