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Clin Implant Dent Relat Res. 2018 Apr;20(2):199-207. doi: 10.1111/cid.12571. Epub 2017 Dec 6.

A retrospective study on clinical and radiological outcomes of oral implants in patients followed up for a minimum of 20 years.

Author information

1
Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
2
Clinic for Prosthodontics, Centre of Dental Specialist Care, Malmö, Sweden.
3
Department of Biomaterials, Göteborg University, Göteborg, Sweden.
4
Department of Prosthodontics, Sahlgrenska Academy, Göteborg University, Göteborg, Sweden.

Abstract

BACKGROUND:

Very long-term follow-up of oral implants is seldom reported in the literature.

PURPOSE:

To assess oral implant failure rates and marginal bone loss (MBL) of patients followed up for a minimum of 20 years.

MATERIALS AND METHODS:

Implants placed in patients followed up for 20+ years were included. Descriptive statistics, survival analyses, generalized estimating equations were performed. Three-hundred implants were randomly selected for MBL.

RESULTS:

1,045 implants (227 patients) were included. Implant location, irradiation, and bruxism affected the implant survival rate. Thirty-five percent of the failures occurred within the first year after implantation, and another 26.8% in the second/third year. There was a cumulative survival rate of 87.8% after 36 years of follow-up. In the last radiological follow up, 35 implants (11.7%) had bone gain, and 35 implants (11.7%) presented at least 3 mm of MBL. Twenty-six out of 86 failed implants with available radiograms presented severe MBL in the last radiological register before implant failure.

CONCLUSIONS:

Most of the implant failures occurred at the first few years after implantation, regardless of a very long follow up. MBL can be insignificant in long-term observations, but it may, nevertheless, be the cause of secondary failure of oral implants in some cases.

KEYWORDS:

dental implants; implant failure; long-term follow-up; marginal bone loss; multivariate analysis; risk factors

PMID:
29210186
DOI:
10.1111/cid.12571
[Indexed for MEDLINE]

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