title: One-piece zirconia oral implants: one-year results from a prospective cohort study. 1. Single tooth replacement.
abstract: OBJECTIVE
  To investigate the clinical and radiographic outcome of a one-piece zirconia oral implant for single tooth replacement after 1 year.
  
  
  METHODS
  A total of 65 patients received a one-stage implant surgery with immediate temporization. Standardized radiographs were taken at implant insertion and after 1 year to monitor peri-implant bone loss. A univariate analysis of the influence of different baseline parameters on marginal bone loss from implant insertion to 12 months was performed. Soft tissue parameters were evaluated at prosthesis insertion and at the 1-year follow-up.
  
  
  RESULTS
  After 1 year, three implants were lost, giving a cumulative survival rate of 95.4%. The marginal bone loss after 1 year was 1.31 mm. Thirty-four per cent of the implants lost at least 2 mm bone, and 14% more than 3 mm. The univariate analysis could not depict any parameter influencing marginal bone loss. Probing depth, Clinical Attachment Level, Bleeding and Plaque Index decreased over 1 year.
  
  
  CONCLUSIONS
  The cumulative survival rate of the presented ceramic implant was comparable to the reported survival rate of titanium implants when immediately restored. However, the frequency of increased radiographic bone loss (>2 mm) after 1 year was considerably higher as compared to conventional two-piece titanium implants. The presented zirconia implant can therefore not be recommended for clinical usage.
authors.affiliation: Department of Prosthodontics, School of Dentistry, Albert-Ludwigs University, Freiburg, Germany. ralf.kohal@uniklinik-freiburg.de
authors.forename: Ralf-Joachim
authors.initials: RJ
authors.lastname: Kohal
authors.forename: Marko
authors.initials: M
authors.lastname: Knauf
authors.forename: Birgitta
authors.initials: B
authors.lastname: Larsson
authors.forename: Herman
authors.initials: H
authors.lastname: Sahlin
authors.forename: Frank
authors.initials: F
authors.lastname: Butz
mesh_terms: D016301:Alveolar Bone Loss / Q000209:etiology*; D000704:Analysis of Variance; D015331:Cohort Studies; D019250:Dental Implants, Single-Tooth / Q000009:adverse effects*; D003776:Dental Porcelain / Q000009:adverse effects*; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005889:Gingival Recession / Q000209:etiology; D006801:Humans; D015993:Life Tables; D008297:Male; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D015019:Yttrium / Q000009:adverse effects*; D015040:Zirconium / Q000009:adverse effects*
chemical_list: C499362:yttria stabilized tetragonal zirconia; D003776:Dental Porcelain; D015019:Yttrium; D015040:Zirconium