title: A retrospective study on 287 implants installed in resorbed maxillae grafted with fresh frozen allogenous bone.
abstract: BACKGROUND
  Several studies have been performed to evaluate the clinical outcome of implants inserted into maxillae grafted with autogenous bone but few reports have focused on maxillae grafted with fresh-frozen allogenous bone (FFAB).
  
  
  OBJECTIVE
  The purpose of this study is to retrospectively evaluate the clinical outcome of implants installed in resorbed maxillae augmented with FFAB.
  
  
  METHODS
  A total of 69 patients whom had been treated with FFAB grafts to their maxillae and implant placement 4 to 6 months later were retrospectively evaluated. Edentulism was total and partial in 22 and 47 cases, respectively. A total of 287 implants of various systems had been used. A life table analysis was performed. Marginal bone loss was calculated in radiographs.
  
  
  RESULTS
  Five of the 287 implants were lost, giving a survival rate (SVR) of 98.3% over a mean follow-up time of 26 months. The marginal bone resorption at the implants was 1.68 mm (SD = 0.44) after 1 year and 1.85 mm (SD = 0.98) after 4 years. The cumulative success rate based on defined criteria was 96% in the first year but decreased to 40% at 4 years because of marginal bone loss. The Kaplan-Meier algorithm demonstrated a better outcome for female patients, removable dentures, and total edentulism. No differences were detected among diameters, lengths, and implant site.
  
  
  CONCLUSIONS
  Implants placed in FFAB showed a high SVR similar to that reported in previous studies on maxillae grafted with autogenous iliac crest bone. Although our data point to more marginal bone loss in partially edentulous patients and for fixed prosthetic restorations, the use of FFAB for reconstruction of the atrophic jaw prior to implant placement can be considered as a reliable alternative to autogenous bone.
authors.affiliation: Maxillofacial Surgery, University of Ferrara, Ferrara, Italy. crc@unife.it
authors.forename: Francesco
authors.initials: F
authors.lastname: Carinci
authors.forename: Giorgio
authors.initials: G
authors.lastname: Brunelli
authors.forename: Maurizio
authors.initials: M
authors.lastname: Franco
authors.forename: Alessandro
authors.initials: A
authors.lastname: Viscioni
authors.forename: Leone
authors.initials: L
authors.lastname: Rigo
authors.forename: Riccardo
authors.initials: R
authors.lastname: Guidi
authors.forename: Laura
authors.initials: L
authors.lastname: Strohmenger
mesh_terms: D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000534:rehabilitation*; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D016025:Bone Transplantation / Q000379:methods*; D003758:Dental Implantation, Endosseous; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005615:Freezing; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation*; D053208:Kaplan-Meier Estimate; D015993:Life Tables; D008297:Male; D008439:Maxillary Diseases / Q000534:rehabilitation; D008875:Middle Aged; D016016:Proportional Hazards Models; D011859:Radiography; D012189:Retrospective Studies; D014019:Tissue Donors