title: Biomechanical aspects in late implant failures: scanning electron microscopy analysis of four clinical cases.
abstract: OBJECTIVE
  The aim of this work is to analyze by scanning electron microscopy implant components that have mechanically failed in vivo.
  
  
  METHODS
  Three clinical cases are presented relative to single lateral posterior restorations supported by implants and a case of a mandibular overdenture supported by two implants. In all the reported cases the presence of an incongruous occlusal load caused the fracture of the components of the implant supported restorations.
  
  
  CONCLUSIONS
  From the analysis of the cases examined in this study, it is deduced that the functional overload influences the biomechanical behavior of the prosthetic rehabilitation supported by an implant and may, in less fortunate cases, determine the failure following the fracture of the connecting screws and/or the fixture.
authors.affiliation: Department of Oral Science, Nano and Biotechnology, University Gd Annunzio of Chieti-Pescara, Italy. d.diiorio@unich.it
authors.forename: Donato
authors.initials: D
authors.lastname: Di Iorio
authors.forename: Bruna
authors.initials: B
authors.lastname: Sinjari
authors.forename: Beatrice
authors.initials: B
authors.lastname: Feragalli
authors.forename: Giovanna
authors.initials: G
authors.lastname: Murmura
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D001732:Bite Force; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D019250:Dental Implants, Single-Tooth; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D013314:Stress, Mechanical; D013499:Surface Properties; D019415:Torque
chemical_list: D015921:Dental Implants