Benefits of mineralized bone cortical allograft for immediate implant placement in extraction sites: an in vivo study in dogs
Orti Valerie, Bousquet Philippe, Tramini Paul, Gaitan Cesar, Mertens Brenda, Cuisinier Frederic,
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( Orti Valerie ) - Montpellier University Hospital Department of Periodontology
( Bousquet Philippe ) - Montpellier University Hospital Department of Periodontology
( Tramini Paul ) - University of Montpellier Laboratory of Bioengineering and Nanoscience
( Gaitan Cesar ) - Universidad Autonoma Centro Ciencias de la Salud Department of Stomatology
( Mertens Brenda ) - Montpellier University Hospital Department of Periodontology
( Cuisinier Frederic ) - Montpellier University Hospital Department of Periodontology
KMID : 0363020160460050291
Abstract
Purpose: 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.
키워드
Allografts; Alveolar bone loss; Bone regeneration; Dental implants; Tooth extraction
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