Various types of periodontal probes (e.g., metal probes, plastic/bendable probes, electronic periodontal probes) are used for peri-implant pocket depth registration; however, depending on the shape and size of the prosthetic restoration an accurate peri-implant pocket registration might be impeded with standard metal probes. There is currently no systematic assessment of which probe is more accurate in peri-implant pocket registration. Therefore, peri-implant pocket registration of 50 patients with a screw-retained prosthetic restoration will be recorded with 3 different periodontal probes; i.e., with a metal probe, with a plastic probe, and with an automatic periodontal probe, before and after removal of the prosthetic restoration.

Inclusion Criteria:

• screw-retained prosthetic implant restoration

Exclusion Criteria:

- cemented prosthetic implant restoration

In 50 patients with a screw-retained prosthetic restoration the peri-implant pocket registration will be recorded with 3 different types of periodontal probes; measurements will be performed in patients for baseline assessment (i.e., before surgical intervention) as well as in patients for annual post-operative controls to include a wide range of shallow, average, and deeper peri-implant pocket depths.