Abstract:Objective To explore the effect of minocycline on periodontal pathogens in subgingival plaque of aggressive periodontitis (AgP) treated with subgingival curettage and root planing .Methods A total of 206 AgP patients admitted to our hospital from March 2019 to March 2021 were selected, and they were divided into study group (103 cases) and control group (103 cases) via random number table method. The control group was given conventional treatment with subgingival curettage and root planing, and the study group was additionally given minocycline on the basis of the control group. The clinical effects of the two groups were recorded, and alterations in periodontal parameters, inflammatory factors and periodontal pathogens before and after the treatment as well as the incidence of adverse reactions were compared between the two groups.Results The overall effective rate of the study group was higher than that of the control group (P < 0.05). The differences of sulcus bleeding index, gingival attachment level, plaque index, periodontal pocket depth before and after treatment in the study group were higher than those in the control group (P < 0.05). The differences of tumor necrosis factor-α, interleukin-6, and interleukin-8 levels before and after treatment in the study group were also higher than those in the control group (P < 0.05). In terms of the periodontal pathogens, the differences of the detection rate of Porphyromonas gingivalis, Tannerella forsythia and Treponema denticola before and after treatment were greater in the study group relative to the control group (P < 0.05). There was no difference in the overall incidence of adverse reactions between the study group and the control group (P > 0.05).Conclusions Minocycline may enhance the clinical efficacy of subgingival curettage and root planing for AgP. It improves the periodontal condition, reduces the inflammation, eliminate periodontal pathogens, and exhibits a good safety profile.