title: Long-term cumulative survival and mechanical complications of single-tooth Ankylos Implants: focus on the abutment neck fractures.
abstract: OBJECTIVE
  To evaluate the cumulative survival rate (CSR) and mechanical complications of single-tooth Ankylos® implants.
  
  
  METHODS
  This was a retrospective clinical study that analyzed 450 single Ankylos® implants installed in 275 patients between December 2005 and December 2012. The main outcomes were survival results CSR and implant failure) and mechanical complications (screw loosening, fracture, and cumulative fracture rate [CFR]). The main outcomes were analyzed according to age, sex, implant length or diameter, bone graft, arch, and position.
  
  
  RESULTS
  The 8-year CSR was 96.9%. Thirteen (2.9%) implants failed because of early osseointegration failure in 3, marginal bone loss in 6, and abutment fracture in 4. Screw loosening occurred in 10 implants (2.2%), and 10 abutment fractures occurred. All abutment fractures were located in the neck, and concurrent screw fractures were observed. The CSR and rate of screw loosening did not differ significantly according to factors. The CFR was higher in middle-aged patients (5.3% vs 0.0% in younger and older patients); for teeth in a molar position (5.8% vs 0.0% for premolar or 1.1% for anterior position); and for larger-diameter implants (4.5% for 4.5 mm and 6.7% for 5.5 mm diameter vs 0.5% for 3.5 mm diameter) (all P<.05).
  
  
  CONCLUSIONS
  The Ankylos® implant is suitable for single-tooth restoration in Koreans. However, relatively frequent abutment fractures (2.2%) were observed and some fractures resulted in implant failures. Middle-aged patients, the molar position, and a large implant diameter were associated with a high incidence of abutment fracture.
authors.affiliation: Department of Prosthodontics, Hallym University School of Medicine, Hallym University Sacred Heart Hospital, Anyang, Republic of Korea.
authors.forename: Hye Won
authors.identifier: 0000-0002-3035-0963
authors.initials: HW
authors.lastname: Shim
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hallym University School of Medicine, Hallym University Sacred Heart Hospital, Anyang, Republic of Korea.
authors.forename: Byoung-Eun
authors.identifier: 0000-0002-4446-6772
authors.initials: BE
authors.lastname: Yang
keywords: Dental implant-abutment design; Dental implants; Osseointegration; Periprosthetic fractures; Single-tooth
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