Clinical and Radiographic Outcomes of Single-Unit Implant- Supported Restorations: A 12-Month Cross-Sectional Clinical Study.

Abstract

Purpose: This retrospective clinical study aims to analyze single-unit implant-supported restorations' clinical and radiographic outcomes comprehensively.

Materials and methods: In this retrospective study, patients who had undergone 12 months of implant-supported singleunit fixed prosthetic treatment were scanned from the archives, and a hundred patients were included in the study. Implant success and survival rates were assessed according to the consensus decisions published at the International Oral Implantology Congress in 2007. Prosthetic complications such as chipping, screw loosening, and decementation were also evaluated. In addition, success/survival rates and prosthetic compositions were associated with some surgical and prosthetic parameters.

Results: According to the success/survival criteria, 88% of the implants were successful, 10% had satisfactory survival, and 2% had compromised survival. The risk of satisfactory or compromised survival was 62.5 times higher in individuals with inadequately keratinized mucosa compared to those with adequately keratinized mucosa (p < 0.001). It was also 5.736 times greater for extractions due to periodontal disease versus endodontic reasons (p = 0.010) and 4.629 times higher for implants with diameters less than 3.75 mm compared to those between 3.75 mm and 5 mm (p = 0.037). Screw loosening was observed in 15% of the evaluated restorations, decementation in 13% and chipping in 4%, and the risk of screw loosening was 4.444 times higher for screw retention abutments compared to standard abutments (p=0.015).

Conclusion: Insufficient keratinized mucosa, periodontal problems leading to tooth extractions, and the use of narrowdiameter implants can negatively affect the success of implant procedures. Loosening in screw-retained restorations is due solely to screw loosening, which is a high risk for screwretained restorations. Loosening in cement-retained restorations, on the other hand, is caused by the decementation of the prosthetic restoration or loosening of the abutment screw supporting the restoration.