Retrospective Analysis of Implant-Prosthetic Rehabilitations Over a Period of 25 Years.

Purpose/Aim: The aim of this study was to investigate the implant survival and bone resorption of implant-prosthetic rehabilitations during a period between 2 and 27 years of follow-up performed at the C.I.R. Dental School University of Turin, Italy. Materials and Methods: A total of 431 patients were contacted by telephone for a total of 1,107 implants, and 185 patients were visited for a total of 712 implants. The following were per-formed in all the recruited patients: complete periodontal chart; intraoral radiographs of the implant sites; and photographs. Crestal bone loss was calculated on the radiographic documentation with dedicated software. Patients were divided by type of rehabilitation in the maxillary or mandibular anterior or posterior zones: single crown; partial or total denture; or overdenture. A further division was made in relation to the period elapsed since implant placement, into less than 10 years or more than 10 years. Results: Mean implant survival for the entire follow-up period was as follows: single crowns 94%; partial dentures 94%; total dentures 95%; overdentures 98%. Mean crestal bone loss was as follows: single crowns 1.43 mm; partial dentures 2.68 mm; total dentures 3.12 mm; and overdentures 1.96 mm. Conclusions: Implant-prosthetic rehabilitations performed at the University of Turin seem to have good medium- and long-term survival rates and radiographic bone resorption according to the data reported in the literature for the different types of rehabilitations.