title: Bone defect formation during implant placement following alveolar distraction.
abstract: OBJECTIVE
  This retrospective study was designed to evaluate the volume of hard tissue generated at the time of implant placement in distracted alveolar bone.
  
  
  METHODS
  All patients who underwent distraction osteogenesis between 2000 and 2003 were included. The preoperative bone height, amount of distraction performed, and presence or absence of complications affecting implant placement were recorded. The augmentation achieved was correlated with insufficient bone formation using the Spearman correlation and the Fisher exact test.
  
  
  RESULTS
  The study included 43 implants placed in 17 cases of alveolar distraction. Of the 34 implants placed in bone augmented by 4.5 to 6.5 mm, bone defects were observed with 12. All 9 implants placed in ridges augmented by 7 to 10.5 mm demonstrated a bone defect. The "defect" and "no-defect" implant groups differed significantly with respect to preoperative bone height and amount of distraction performed (P < .001 for both). Significantly more defects were formed in bone augmented by > 25% compared to bone augmented by < 25% (P < .001).
  
  
  CONCLUSIONS
  When considering distraction osteogenesis, augmentation of up to 25% of the initial bone height seems more predictable and less likely to be associated with complications at the time of implant placement. In distractions greater than 25% of the original height, additional treatment should be considered.
authors.affiliation: Oral Surgery Unit, School of Dentistry, University of Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: Nikola
authors.initials: N
authors.lastname: Saulacic
authors.forename: Manuel
authors.initials: M
authors.lastname: Somosa Martín
authors.forename: Pilar
authors.initials: P
authors.lastname: Gándara Vila
authors.forename: Abel
authors.initials: A
authors.lastname: García García
mesh_terms: D000328:Adult; D000539:Alveolar Process / Q000473:pathology; D000540:Alveolar Ridge Augmentation / Q000009:adverse effects* / Q000379:methods; D002508:Cephalometry; D015921:Dental Implants / Q000009:adverse effects; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000473:pathology / Q000601:surgery; D008336:Mandibular Diseases / Q000209:etiology*; D008437:Maxilla / Q000473:pathology / Q000601:surgery; D008439:Maxillary Diseases / Q000209:etiology*; D008875:Middle Aged; D010012:Osteogenesis / Q000502:physiology; D019857:Osteogenesis, Distraction / Q000009:adverse effects* / Q000379:methods; D012189:Retrospective Studies; D013529:Surgical Wound Dehiscence / Q000209:etiology
chemical_list: D015921:Dental Implants