title: Healing at mandibular block-grafted sites. An experimental study in dogs.
abstract: OBJECTIVE
  The aim of this study was to evaluate the healing of autologous bone block grafts or deproteinized bovine bone mineral (DBBM) block grafts applied concomitantly with collagen membranes for horizontal alveolar ridge augmentation.
  
  
  METHODS
  In six Labrador dogs, molars were extracted bilaterally, the buccal bony wall was removed, and a buccal box-shaped defect created. After 3 months, a bony block graft was harvested from the right ascending ramus of the mandible and reduced to a standardized size. A DBBM block was tailored to similar dimensions. The two blocks were secured with screws onto the buccal wall of the defects in the right and left sides of the mandible, respectively. Resorbable membranes were applied at both sides, and the flaps sutured. After 3 months, one implant was installed in each side of the mandible, in the interface between grafts and parent bone. After 3 months, biopsies were harvested and ground sections prepared to reveal a 6-month healing period of the grafts.
  
  
  RESULTS
  77 ± 6.2% and 5.9 ± 7.5% of vital mineralized bone were found at the autologous bone and DBBM block graft sites, respectively. Moreover, at the DBBM site, 63 ± 11.7% of connective tissue and 31 ± 15.5% of DBBM occupied the area analyzed. Only 0.2 ± 0.4% of DBBM was found in contact with newly formed bone. The horizontal loss was in a mean range of 0.9-1.8 mm, and 0.3-0.8 mm, at the autologous bone and DBBM block graft sites, respectively.
  
  
  CONCLUSIONS
  Autologous bone grafts were vital and integrated to the parent bone after 6 months of healing. In contrast, DBBM grafts were embedded into connective tissue, and only a limited amount of bone was found inside the scaffold of the biomaterial.
authors.affiliation: Ariminum Odontologica, ARDEC, Rimini, Italy.
authors.forename: Enzo
authors.initials: E
authors.lastname: De Santis
authors.forename: Niklaus P
authors.initials: NP
authors.lastname: Lang
authors.forename: Giovanni
authors.initials: G
authors.lastname: Favero
authors.forename: Marco
authors.initials: M
authors.lastname: Beolchini
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Morelli
authors.forename: Daniele
authors.initials: D
authors.lastname: Botticelli
mesh_terms: D000540:Alveolar Ridge Augmentation; D000818:Animals; D001861:Bone Regeneration / Q000502:physiology*; D018786:Bone Substitutes; D016025:Bone Transplantation; D002417:Cattle; D015921:Dental Implants; D004285:Dogs; D008334:Mandible / Q000166:cytology / Q000502:physiology / Q000601:surgery; D023421:Models, Animal; D014945:Wound Healing
chemical_list: D018786:Bone Substitutes; D015921:Dental Implants
keywords: animal study; bone defects; bone graft; bone healing; bone regeneration; deproteinized bovine bone mineral; histology