title: Implant success rates in full-arch rehabilitations supported by upright and tilted implants: a retrospective investigation with up to five years of follow-up.
abstract: OBJECTIVE
  The aim of this retrospective study was to investigate the cumulative success rate, the implant survival rate, and the occurrence of biological complications in implants supporting full-arch immediately loaded rehabilitations supported by upright and tilted implants.
  
  
  METHODS
  The clinical records and periapical radiographs of patients who attended follow-up visits were collected, and information was recorded regarding marginal bone loss resorption, the occurrence of peri-implant infectious diseases, and the implant survival rate. Implants were classified as successful or not successful according to two distinct classifications for implant success.
  
  
  RESULTS
  A total of 53 maxillary and mandibular restorations including 212 implants were analysed, of which 56 implants were studied over the full five-year follow-up period. After five years, the cumulative success rate was 76.04% according to the Misch classification and 56.34% according to the Albrektsson classification. The cumulative implant survival rate was 100%, although one implant was found to be affected by peri-implantitis at the second follow-up visit.
  
  
  CONCLUSIONS
  The cumulative success rate of the implants dropped over time, corresponding to the progression of marginal bone resorption. The prevalence of peri-implantitis was very low, and the implant survival rate was not found to be related to the cumulative success rate.
authors.affiliation: Università degli Studi di Milano, Department of Biomedical, Surgical and Dental Sciences, Research Centre in Oral Implantology, Milan, Italy.; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Luca
authors.identifier: 0000-0001-5775-8961
authors.initials: L
authors.lastname: Francetti
authors.affiliation: Università degli Studi di Milano, Department of Biomedical, Surgical and Dental Sciences, Research Centre in Oral Implantology, Milan, Italy.; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Andrea
authors.identifier: 0000-0002-2352-9391
authors.initials: A
authors.lastname: Rodolfi
authors.affiliation: Università degli Studi di Milano, Department of Biomedical, Surgical and Dental Sciences, Research Centre in Oral Implantology, Milan, Italy.; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Bruno
authors.identifier: 0000-0001-8389-1942
authors.initials: B
authors.lastname: Barbaro
authors.affiliation: Università degli Studi di Milano, Department of Biomedical, Surgical and Dental Sciences, Research Centre in Oral Implantology, Milan, Italy.; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Silvio
authors.identifier: 0000-0002-7866-5024
authors.initials: S
authors.lastname: Taschieri
authors.affiliation: Università degli Studi di Milano, Department of Biomedical, Surgical and Dental Sciences, Research Centre in Oral Implantology, Milan, Italy.; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Nicolò
authors.identifier: 0000-0002-1091-7918
authors.initials: N
authors.lastname: Cavalli
authors.affiliation: Università degli Studi di Milano, Department of Biomedical, Surgical and Dental Sciences, Research Centre in Oral Implantology, Milan, Italy.; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Stefano
authors.identifier: 0000-0001-8428-8811
authors.initials: S
authors.lastname: Corbella
keywords: Bone resorption; Dental implants; Dental restoration failure; Implant-supported dental prosthesis; Peri-implantitis