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Nine- to fourteen-year follow-up of implant treatment. Part II: presence of peri-implant lesions


Stefan Renvert
Department of Health Sciences
Kristianstad University
291 88 Kristianstad


Objectives: The aim of this study was to analyse the proportions of peri-implant lesions at implants after 9–14 years of function.

Material and Methods: Two hundred and ninety-four patients underwent implant therapy during the years 1988–1992 in Kristianstad County. These individuals were recalled to the speciality clinic 1 and 5 years after placement of the suprastructure. Between 2000 and 2002, 218 patients with 999 implants were examined clinically and radiographically.

Results: Forty-eight per cent of the implants had probing depth geqslant R: gt-or-equal, slanted4 mm and bleeding on probing (peri-implant mucositis). In 20.4% of the implants, the bone level was located 3.1 mm apical to the implant shoulder. Progressive bone loss (geqslant R: gt-or-equal, slanted1.8 mm) during the observation period was found in 7.7% of the implants. Peri-implantitis defined as bone loss geqslant R: gt-or-equal, slanted1.8 mm compared with 1-year data (the apical border of the bony defect located at or apical to the third thread, i.e. a minimum of 3.1 mm apical to the implant shoulder), combined with bleeding on probing and or pus, were diagnosed among 16% of the patients and 6.6% of the implants.

Conclusion: After 10 years in use without systematic supportive treatment, peri-implant lesions is a common clinical entity adjacent to titanium implants.