title: Histological and histomorphometrical analyses of biopsies harvested 11 years after maxillary sinus floor augmentation with deproteinized bovine and autogenous bone.
abstract: OBJECTIVE
  The purpose of the present study was to histologically and histomorphometrically evaluate the long-term tissue response to deproteinized bovine bone (DPBB) particles used in association with autogenous bone and to compare particle size after 6 months and 11 years, in the same patients, in order to determine possible resorption.
  
  
  METHODS
  Twenty consecutive patients (14 women and six men) with a mean age of 62 years (range 48-69 years) with severe atrophy of the posterior maxilla were included in this study. Thirty maxillary sinuses with <5 mm subantral alveolar bone were augmented with a mixture of 80% DPBB and 20% autogenous bone. Eleven years (mean 11.5 years) after augmentation, biopsies were taken from the grafted areas of the 11 patients who volunteered to participate in this new surgical intervention. The following histomorphometrical measurements were performed in these specimens: total bone area in percentage, total area of the DPBB, total area of marrow space, the degree of DPBB-bone contact (percentage of the total surface length for each particle), the length of all DPBB particles and the area of all DPBB particles. The length and the area of the particles were compared with samples harvested from the same patients at 6 months (nine samples) and pristine particles from the manufacturer.
  
  
  RESULTS
  The biopsies consisted of 44.7+/-16.9% lamellar bone, 38+/-16.9% marrow space and 17.3+/-13.2% DPBB. The degree of DPBB to bone contact was 61.5+/-34%. There were no statistically significant differences between the length and area of the particles after 11 years compared with those measured after 6 months in the same patients or to pristine particles from the manufacturer.
  
  
  CONCLUSIONS
  DPBB particles were found to be well integrated in lamellar bone, after sinus floor augmentation in humans, showing no significant changes in particle size after 11 years. To cite this article: Mordenfeld A, Hallman M, Johansson CB, Albrektsson T. Histological and histomorphometrical analyses of biopsies harvested 11 years after maxillary sinus floor augmentation with deproteinized bovine and autogenous bone.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Public Health Service, Gävle, Sweden. arne.mordenfeld@lg.se
authors.forename: Arne
authors.initials: A
authors.lastname: Mordenfeld
authors.forename: Mats
authors.initials: M
authors.lastname: Hallman
authors.forename: Carina B
authors.initials: CB
authors.lastname: Johansson
authors.forename: Tomas
authors.initials: T
authors.lastname: Albrektsson
mesh_terms: D000368:Aged; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000818:Animals; D001284:Atrophy; D001706:Biopsy; D015519:Bone Density / Q000502:physiology; D001853:Bone Marrow / Q000473:pathology; D001857:Bone Matrix / Q000637:transplantation; D018786:Bone Substitutes / Q000627:therapeutic use; D016025:Bone Transplantation / Q000379:methods*; D002417:Cattle; D003758:Dental Implantation, Endosseous; D005260:Female; D005500:Follow-Up Studies; D015726:Giant Cells / Q000473:pathology; D006085:Graft Survival; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000473:pathology / Q000601:surgery; D008443:Maxillary Sinus / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged; D008903:Minerals / Q000627:therapeutic use; D010316:Particle Size; D013524:Surgical Flaps; D020858:Tissue and Organ Harvesting / Q000379:methods; D014182:Transplantation, Autologous
chemical_list: C077540:Bio-Oss; D018786:Bone Substitutes; D008903:Minerals