Long-term treatment outcomes in edentulous patients with implant overdentures: the Toronto study

Thirty patients (mean age 70 years) with 32 prostheses attended the final recall visit, with 67% of patients followed for 15.53 years (range 10 to 19 years).

Six implants failed, and the prosthetic plan and implant cumulative survival rates were both in excess of 90%.

Mean marginal bone loss around implants after the first year of loading was small (0.05 mm/year), although the individual variation was high.

Prosthetic maintenance included fractured components, denture relining, and replacement of prostheses. On average, the longevity of overdenture prostheses was 12 years, and laboratory relining was necessary every 4 years.