Objective: The aim of the present in vitro study was to evaluate the efficacy of phthalocyanine dye in photodynamic therapy (PDT) as an adjunct to mechanical debridement in the management of peri-implantitis. Methods: S. aureus, F. nucleatum and P. gingivalis were coated on titanium (Ti) discs and were divided in control and test groups. In control group, mechanical debridement + laser was performed; and in test group, PDT with hydroxyaluminium phthalocyanine (AIPcOH) dye as photosensitizer was used. Bacterial colony counts and surface hardness were assessed post-operatively. Results: There was a significant difference in the bacterial count reduction at different time intervals in the test group (p=0.01), when compared to the control group; no significant difference was observed in surfaces hardness (p=0.7). Conclusion: This present in vitro study concluded that PDT with AIPcOH dye was effective in eradicating S. aureus, F. nucleatum and P. gingivalis on Ti discs. This study also concluded that the PDT with photosensitizer can be used as an adjunct in management of peri-implantitis.
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