title: Benefits of mineralized bone cortical allograft for immediate implant placement in extraction sites: anin vivostudy in dogs.
abstract: OBJECTIVE
  The aim of the present study was to evaluate the effectiveness of using a mineralized bone cortical allograft (MBCA), with or without a resorbable collagenous membrane derived from bovine pericardium, on alveolar bone remodeling after immediate implant placement in a dog model.
  
  
  METHODS
  Six mongrel dogs were included. The test and control sites were randomly selected. Four biradicular premolars were extracted from the mandible. In control sites, implants without an allograft or membrane were placed immediately in the fresh extraction sockets. In the test sites, an MBCA was placed to fill the gap between the bone socket wall and implant, with or without a resorbable collagenous membrane. Specimens were collected after 1 and 3 months. The amount of residual particles and new bone quality were evaluated by histomorphometry.
  
  
  RESULTS
  Few residual graft particles were observed to be closely embedded in the new bone without any contact with the implant surface. The allograft combined with a resorbable collagen membrane limited the resorption of the buccal wall in height and width. The histological quality of the new bone was equivalent to that of the original bone. The MBCA improved the quality of new bone formation, with few residual particles observed at 3 months.
  
  
  CONCLUSIONS
  The preliminary results of this animal study indicate a real benefit in obtaining new bone as well as in enhancing osseointegration due to the high resorbability of cortical allograft particles, in comparison to the results of xenografts or other biomaterials (mineralized or demineralized cancellous allografts) that have been presented in the literature. Furthermore, the use of an MBCA combined with a collagen membrane in extraction and immediate implant placement limited the extent of post-extraction resorption.
authors: Department of Periodontology, Montpellier University Hospital, Montpellier, France.; Laboratory of Bioengineering and Nanoscience, University of Montpellier, Montpellier, France.
authors: Valérie
authors: 0000-0002-7901-9227
authors: V
authors: Orti
authors: Department of Periodontology, Montpellier University Hospital, Montpellier, France.; Laboratory of Bioengineering and Nanoscience, University of Montpellier, Montpellier, France.
authors: Philippe
authors: 0000-0002-4444-2703
authors: P
authors: Bousquet
authors: Laboratory of Bioengineering and Nanoscience, University of Montpellier, Montpellier, France .
authors: Paul
authors: 0000-0002-8227-9150
authors: P
authors: Tramini
authors: Department of Stomatology, Centro Ciencias de la Salud, Universidad Autónoma, Aguascalientes, Mexico .
authors: Cesar
authors: 0000-0001-6452-2578
authors: C
authors: Gaitan
authors: Department of Periodontology, Montpellier University Hospital, Montpellier, France .
authors: Brenda
authors: 0000-0002-3649-4351
authors: B
authors: Mertens
authors: Department of Periodontology, Montpellier University Hospital, Montpellier, France.; Laboratory of Bioengineering and Nanoscience, University of Montpellier, Montpellier, France.
authors: Frédéric
authors: 0000-0001-6870-0490
authors: F
authors: Cuisinier
keywords: Allografts; Alveolar bone loss; Bone regeneration; Dental implants; Tooth extraction