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Analysis of fractured dental implant body from five different implant systems: a long-term retrospective study

  • H. Yu
    Affiliations
    Fourth Division Department, Peking University School and Hospital of Stomatology, Chaoyang District, Beijing, China
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  • L. Qiu
    Correspondence
    Correspondence to: Fourth Division Department, Peking University School and Hospital of Stomatology, No. 41, Dongsihuanzhong Road, Chaoyang District, Beijing 5715966, China. Tel: +86 010 85715965. Fax: +86 010 85715966.
    Affiliations
    Fourth Division Department, Peking University School and Hospital of Stomatology, Chaoyang District, Beijing, China
    Search for articles by this author

      Abstract

      The aim of this study was to perform an analysis of the incidence of implant body fracture and to identify possible risk factors. A long-term follow-up retrospective evaluation of 3477 patients who received 8588 implants from five implant systems was performed. Overall, 2810 patients who received 7502 implants, with an average follow-up of 6.9 years, were included in the analysis. The overall body fracture rate was 0.49% (37/7502), among which 32.4% (12/37) were implants with a reduced diameter. The estimated cumulative fracture rate was 1.24%. Fractures were observed in two patients with three Brånemark implants, 13 patients with 15 Nobel Replace implants, eight patients with eight Camlog implants, eight patients with 11 Ankylos implants, and none of the patients with Thommen implants. Most fractures occurred in the molar region (29/37) and in single implant-supported restorations (30/37). The results showed significant differences between splinted and unsplinted restorations (P = 0.005) and between regular and narrow diameter implants (P = 0.009). Within the limitations of this retrospective analysis, a narrow implant diameter is a potential risk factor for implant body fracture in the posterior region. Furthermore, unsplinted restorations appear to be associated with a higher rate of implant fracture.

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