Peri-implant tissue stability plays a crucial role in the long-term success of dental implants. A history of periodontitis is considered a major risk factor for peri-implant complications, even in patients undergoing supportive periodontal therapy (SPT). To compare peri-implant clinical and radiographic parameters between individuals with treated periodontitis on regular SPT and periodontally healthy subjects. This cross-sectional observational study included 120 systemically healthy individuals aged 30–55 years, divided into two groups: Group 1 (n=60) with a history of generalized chronic periodontitis who had received full-mouth periodontal therapy and were on SPT for at least one year, and Group 2 (n=60) comprising periodontally healthy individuals. All participants had at least one functional implant placed more than 12 months prior to evaluation. Probing depth (PD), clinical attachment level (CAL), and crestal bone loss (CBL) were recorded around each implant. Statistical analysis was performed using independent t-tests and Chi-square tests, with significance set at p < 0.05. There was no significant difference in age (p=0.38) or sex distribution (p=0.67) between the groups. Group 1 showed significantly higher values for PD (5.21 ± 0.36 mm), CAL (5.48 ± 0.41 mm), and CBL (2.95 ± 0.23 mm) compared to Group 2 (3.56 ± 0.41 mm, 3.68 ± 0.35 mm, and 1.52 ± 0.29 mm, respectively), with all differences being statistically significant (p < 0.05). Patients with a history of periodontitis exhibit greater peri-implant breakdown than periodontally healthy individuals despite being on regular SPT.
