title: Prosthetic Survival and Complication Rate of Single Implant Treatment in the Periodontally Healthy Patient after 16 to 22 Years of Follow-Up.
abstract: BACKGROUND
  Single implants were introduced in the 1980s, but long-term follow-up is scarce.
  
  
  OBJECTIVE
  The study aims to retrospectively investigate the prosthetic survival and complication rates of single implants in periodontally healthy patients after 16-22 years, and to evaluate the influence of different prosthetic procedures.
  
  
  METHODS
  Patients with a single implant were recalled for clinical examination. Prosthetic procedures included single-tooth (ST) and CeraOne (CO) abutments supporting a porcelain-fused-to-metal (PFM), all-ceramic (CER), or gold-acrylic (ACR) crown. Prosthetic survival, success, and occurrence of biological, technical, and aesthetic complications were obtained. Procedures were compared by log-rank tests.
  
  
  RESULTS
  Fifty patients attended the examination. All implants were functional; however, 15% of abutments and 27% of crowns had been renewed. Replacements (1/4) were related to technical issues whereas the main cause was aesthetics. The abutment cumulative survival rate (CSR) differed significantly between ST-PFM (74%), ST-ACR (0%), and CO reconstructions (97%). The crown CSR was significantly lower for ST-ACR crowns (0%) compared with ST-PFM (68%) and CO (81%). Thirty-nine percent of implants remained complication free throughout the mean 18.5 years. Complications (1/3) required component replacement, and 53% occurred within 5 years after surgery.
  
  
  CONCLUSIONS
  Prosthetic survival rates of single implants are encouraging after 16 to 22 years. However, 66% of the patients encountered at least one complication during follow-up.
authors.affiliation: Department of Periodontology and Oral Implantology, Faculty of Medicine and Health Sciences, Dental School, University of Ghent, Ghent, Belgium.|Oral and Maxillofacial Imaging Unit, Faculty of Medicine and Health Sciences, Dental School, University Hospital Ghent, Ghent, Belgium.
authors.forename: Melissa
authors.initials: M
authors.lastname: Dierens
authors.affiliation: Department of Periodontology and Oral Implantology, Faculty of Medicine and Health Sciences, Dental School, University of Ghent, Ghent, Belgium.|Department of Prosthetic Dentistry, Malmö University, Malmö, Sweden.
authors.forename: Hugo
authors.initials: H
authors.lastname: De Bruyn
authors.affiliation: Clinic for Prosthodontics, Centre of Dental Specialist Care, Malmö, Sweden.
authors.forename: Jenö
authors.initials: J
authors.lastname: Kisch
authors.affiliation: Department of Prosthetic Dentistry, Malmö University, Malmö, Sweden.
authors.forename: Krister
authors.initials: K
authors.lastname: Nilner
authors.affiliation: Department of Periodontology and Oral Implantology, Faculty of Medicine and Health Sciences, Dental School, University of Ghent, Ghent, Belgium.|Dental Medicine, Faculty of Medicine and Pharmacy, Free University of Brussels (VUB), Brussels, Belgium.
authors.forename: Jan
authors.initials: J
authors.lastname: Cosyn
authors.affiliation: Department of Periodontology and Oral Implantology, Faculty of Medicine and Health Sciences, Dental School, University of Ghent, Ghent, Belgium.|Department of Prosthetic Dentistry, Malmö University, Malmö, Sweden.
authors.forename: Stefan
authors.initials: S
authors.lastname: Vandeweghe
mesh_terms: D000293:Adolescent; D000328:Adult; D003442:Crowns; D000044:Dental Abutments; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure / Q000706:statistics & numerical data*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000453:epidemiology*; D012189:Retrospective Studies; D013548:Sweden
keywords: complications; dental implants; long-term; prosthetics; single crowns