Introduction: This is a comprehensive, long-term follow-up study of single-implant treatments. At the Brånemark Clinic in Gothenburg, Sweden, during the period of 1982-1985, 16 patients received single-tooth implants.
Objective: This study evaluates the survival rate of the implants after nearly four decades, focusing on the biological and technical complications.
Methods: Of the original 16 patients with a total of 23 implants, 13 patients with 18 implants were available for the follow-up and were included in the study. Clinical and radiographic examinations were performed on these patients.
Results: The cumulative survival rates were 95.6% for the implants and 60.9% for the implant-supported crowns after 38-40 years in function. The marginal bone level changes were 0.9 ± 1.0 mm (range, -0.5─3.0 mm) over the follow-up period. The frequency of biological complications was low; although mucositis was common, no cases of peri-implantitis were observed. The mean plaque index was 16.9% ± 11.6% (range, 1%─34%) and the mean probing depth around the implants was 3.8 ± 2.2 mm (range, 0.0─7.0 mm). Few technical complications were observed, although many of the original implant-supported crowns had been replaced for esthetic reasons.
Conclusion: The findings emphasize the importance of long-term follow-up in implant dentistry, particularly for younger patients, to improve understanding of potential complications and the longevity of treatment outcomes. Overall, single-tooth implants have a favorable long-term prognosis, though crown replacement may eventually be necessary.
Keywords: dental implantation; dental prosthesis; oral and maxillofacial surgeons; osseointegration; prosthodontics; treatment outcome.
© 2025 The Author(s). Clinical Implant Dentistry and Related Research published by Wiley Periodicals LLC.