title: Alveolar Ridge Preservation After Tooth Extraction with DFDBA and Platelet Concentrates: A Radiographic Retrospective Study.
abstract: OBJECTIVE
  The purpose of this study was to evaluate vertical alveolar bone loss 3 months after tooth extraction when a technique of ridge preservation was applied using a particulate demineralized freeze-dried bone allograft 300 - 500 µm associated with platelet concentrates (platelet-rich-fibrin) in the form of gel and membranes.
  
  
  METHODS
  A retrospective radiological clinical study was conducted on 56 patients for whom 95 extractions had been performed immediately followed by alveolar filling. Among the patients, 17 were smokers and 16 were provided with an immediate removable temporary prosthesis after extractions. Vertical bone loss was measured radiologically by panoramic X-ray before extractions and by a computed tomography scan 3 months after, at the level of mid-buccal bone wall, by two independent observers. For statistical analysis, Student's t-test was performed to compare the mean bone loss between mono- and pluri-radicular teeth and to compare the mean bone loss between tobacco usersversusnon users and finally to compare the mean bone loss between individuals that had provisional removable prosthesis and those that had not.
  
  
  RESULTS
  Three months after tooth extraction, the mean of vertical loss of the mid-buccal bone wall was 0.72 (SD 0.71) mm (5.53% SD 5.19). No significant difference between bone loss at mono-radicular and pluri-radicular teeth (P = 0.982) was observed. There was no significant correlation between tobacco habits and bone loss (P = 0.2), nor between provisional removable prosthesis and bone loss (P = 0.786).
  
  
  CONCLUSIONS
  These results indicate a good potential for the technique using Demineralized Freeze-Dried Bone Allograft 300 - 500 µm and platelet concentrates in alveolar bone preservation.
authors.affiliation: Department of Maxillofacial Surgery and Dentistry, Erasme Hospital, Université libre de Bruxelles, Brussels, Belgium.
authors.forename: Behrang
authors.initials: B
authors.lastname: Baniasadi
authors.affiliation: Department of Maxillofacial Surgery and Dentistry, Erasme Hospital, Université libre de Bruxelles, Brussels, Belgium.
authors.forename: Laurence
authors.initials: L
authors.lastname: Evrard
keywords: Allografts; Alveolar bone loss; Extraction socket; Platelet rich fibrin; Ridge preservation; Socket preservation; Tissue regeneration