Abstract: PURPOSE: To investigate the clinical efficacy of dental implant treatment in patients with chronic periodontitis who received standardized periodontal therapy, and to analyze the influence of a history of chronic periodontitis and related factors on dental implant survival rate, so as to provide single-center evidence-based evidence for dental implant treatment in periodontitis patients. METHODS: A total of 232 patients (656 implants inserted) who received dental implant treatment in the Department of Oral Implantology, Nantong Stomatological Hospital from November 2020 to October 2025 were enrolled. According to preoperative periodontal examination findings, they were divided into the experimental group (with a history of periodontitis, 133 patients, 428 implants) and the control group (without a history of periodontitis, 99 patients, 228 implants). Survival analysis of implants was performed using Kaplan-Meier method, and Log-rank test was used to compare survival rates between groups. The effects of periodontitis severity, implant brand and other factors on survival rate were analyzed. RESULTS: The follow-up period ranged from 3 months to 5 years, with a mean time of (2.01±0.56) years. The overall implant survival rate was 92.4%, including 91.8% in the experimental group and 93.4% in the control group, with no significant difference between the two groups (P>0.05). Within the experimental group, there was no significant difference in implant survival rate among patients with different severities of periodontitis (P>0.05), whereas a significant difference was observed among different implant brands (P<0.05). Brand S showed the highest survival rate (94.2%), while Brand C showed the lowest (72.7%). Implant length, placement timing, loading time and prosthesis type had no significant impact on implant survival rate in either group (P>0.05). CONCLUSIONS: After standardized preoperative periodontal treatment and personalized postoperative maintenance, dental implant therapy is safe and feasible in patients with chronic periodontitis, and the implant survival rate shows no significant difference from that in patients without a history of periodontitis. Implant brand may affect the early implant survival rate in periodontitis patients, and implant brands with favorable osseointegration properties can be preferred in clinical practice.

Key words: Periodontitis, Dental implant, Survival rate, Retrospective analysis, Implant maintenance