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Implant failures and age at the time of surgery: A retrospective study on implant treatment in 2915 partially edentulous jaws

Journal article
Authors Torsten Jemt
Published in Clinical Implant Dentistry and Related Research
Volume 21
Issue 4
Pages 686-692
ISSN 1523-0899
Publication year 2019
Published at Institute of Odontology
Pages 686-692
Language en
Keywords age, complication, failure, follow-up, implants, methodology, multivariable
Subject categories Dentistry


Purpose: To further report and analyze data on the prevalence of implant failures related to age at surgery in partially edentulous jaws. Materials and Methods: Altogether, 2915 partially edentulous jaws (Kennedy Class I and II) were consecutively treated with 9167 implants over a 30-year period (1986-2015) in one referral clinic. All implant failures were consecutively recorded and the first event of implant failure was analyzed in relation to patient age at implant surgery. Results: A total of 2453 patients participated in the study. The main observations were a nonlinear, normal distribution association between risk of implant failure and age at surgery with the highest risk in middle-aged patients. The risk for implant failures was significantly higher for middle-aged patients (45-64 years) than for old patients at the time of surgery (P <.05). The overall cumulative survival rates for treated jaws increased consistently from the age group of 40 to 49 years to that of >79 years. However, younger age groups (<40 years) presented a different pattern. Partially edentulous patients included late in the study (2003-2015) presented a more pronounced nonlinear, normal distribution, and the highest risk of implant failure in patients between 50 and 55 years of age at surgery. Conclusions: An overall nonlinear risk pattern of implant failure was observed, with the highest risk in the middle-aged group at implant surgery. Overall cumulative survival rates were highest in the youngest and oldest age groups at implant surgery, and this pattern became more pronounced in patients included late in the study. © 2019 Wiley Periodicals, Inc.

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