title: Dental implant migration in grafted maxillary sinus.
abstract: BACKGROUND
  Migration of oral implants through a previously consolidated graft is an extremely rare event. We reported 2 cases of migration at least 6 months postimplantation in sinus grafted in 2 stages, consequently over 6-month graft maturation period.
  
  
  METHODS
  Sinus elevations and implants placement in 2 patients were performed. Clinical and radiographic follow-up after the prosthetic rehabilitation showed displacement of 1 implant in each patient through the histopathologically verified stable grafts.
  
  
  CONCLUSIONS
  Implants migration through composite graft after maxillary sinus elevation was reported. Reasons for this to occur might be due to the following: fail to achieve implant primary stability, Schneiderian membrane perforation, or graft resorption due to increased osteoclastic activity.
authors.affiliation: Department of Oral Surgery and Implant Dentistry, School of Dentistry, University of Granada, Granada, Spain. pgalindo@ugr.es
authors.forename: Pablo
authors.initials: P
authors.lastname: Galindo-Moreno
authors.forename: Miguel
authors.initials: M
authors.lastname: Padial-Molina
authors.forename: Elena
authors.initials: E
authors.lastname: Sánchez-Fernández
authors.forename: Pedro
authors.initials: P
authors.lastname: Hernández-Cortés
authors.forename: Hom-Lay
authors.initials: HL
authors.lastname: Wang
authors.forename: Francisco
authors.initials: F
authors.lastname: O'Valle
mesh_terms: D018786:Bone Substitutes / Q000627:therapeutic use; D016025:Bone Transplantation / Q000379:methods* / Q000473:pathology; D003094:Collagen; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants / Q000009:adverse effects*; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D005500:Follow-Up Studies; D005548:Foreign-Body Migration / Q000209:etiology*; D006801:Humans; D008297:Male; D008437:Maxilla / Q000473:pathology / Q000601:surgery; D008567:Membranes, Artificial; D008875:Middle Aged; D008903:Minerals / Q000627:therapeutic use; D016348:Osseointegration / Q000502:physiology; D059546:Sinus Floor Augmentation / Q000379:methods*
chemical_list: C106416:Bio-Gide; C077540:Bio-Oss; D018786:Bone Substitutes; D015921:Dental Implants; D008567:Membranes, Artificial; D008903:Minerals; D003094:Collagen