Association Between Peri-implant Tissue Health and Crown Shape: a Prospective Study

This prospective cohort study aims to investigate the associations between the morphology of single-tooth implant-supported restorations, implant-related local factors, and peri-implant tissue health. Participants receiving a single implant-supported restoration will undergo routine clinical follow-up. Peri-implant clinical parameters, supragingival and subgingival plaque, peri-implant crevicular fluid, intraoral scans, and periapical radiographs will be collected during routine follow-up visits. The study will evaluate whether factors including implant three-dimensional position, restoration emergence profile, emergence angle, mucosal tunnel depth, restoration retention type, abutment type, and patient-related factors are associated with peri-implant inflammation, microbiological composition, marginal bone level, and peri-implant soft tissue changes. The primary hypothesis is that deviation between the actual implant position and the digitally planned ideal implant position, as well as prosthetic emergence morphology, may be associated with peri-implant inflammation and changes in the local microbiome.

Inclusion Criteria * Age greater than 18 years. * Presence of a single implant-supported restoration. * Implant placement performed according to a Type 3 or Type 4 timing protocol following tooth extraction. * Presence of natural teeth adjacent to the implant site on both the mesial and distal sides. * Willingness to participate in the scheduled follow-up assessments. * Ability and willingness to provide written informed consent. Exclusion Criteria * Pregnancy or plans to become pregnant during the study period. * Presence of a disease or medical condition considered unsuitable for dental implant treatment. * Unwillingness to provide written informed consent.