The aim of the study is to examine potential influencing factors on the changes in the periodontal parameters probing pocket depth (PPD), bleeding on probing (BOP), and alveolar bone loss (ABL) on implants and control teeth (using a split-mouth design) over five (T-5), 7.5 (T-7), and ten years (T-10) of supportive periodontal care (SPC). For this purpose, 150 patients with periodontitis and implants are re-examined cross-sectionally (T0), and the changes in the main peri-implant and periodontal target parameters are compared retrospectively at the specified observation time points (T-5, T-7, T-10).

Potential influencing factors to peri-implant conditions include patient-related factors, therapy-related factors and implant-related factors. In addition, patients will be surveyed using validated questionnaires on oral health-related quality of life (OHIP-G14), and a number of common risk factors for periodontits and peri-implant conditions.

Inclusion Criteria:

Patient-related:

• At least one dental implant present
• Age ≥ 18 years at the beginning of the observation period
• Verbal and written consent
• Complete periodontal and dental status at one of the defined observation time points with 6 probing sites per tooth/implant and bleeding on probing (BOP) recorded during the periodontal maintenance phase

Locally:

• a contralateral control tooth to the implant is present at the first defined observation time point
• BOP recorded on the implant

Exclusion Criteria:

• No written and verbal consent
• Younger than 18 years

The study cohort is recruited from patients of the Department of Conservative Dentistry at Heidelberg University Hospital who have undergone systematic periodontal therapy, have a dental implant, and meet the other inclusion criteria.