title: Effect of grafting materials on osseointegration of dental implants surrounded by circumferential bone defects. An experimental study in the dog.
abstract: OBJECTIVE
  This study was designed to evaluate the effect of gap width and graft placement on bone healing around implants placed into simulated extraction sockets in the mandibles of four beagle dogs.
  
  
  METHODS
  Four Ti-Unite implants (13 mm x 3.3 mm) were placed on each side of the mandible. Three implants were surrounded by a 1.35 mm circumferential and a 5 mm deep gap around the coronal portion of the implants. A fourth implant was inserted conventionally into both sides of the mandibles as a positive control. The gaps were filled with either Bio-Oss, autogenous bone or with a blood clot alone. The study design was balanced for animal, side and modality. Ground sections were prepared from biopsies taken at 3 months, and computer-aided histometric measurements of bone/implant contact and area of bone within threads were made for the coronal 5 mm. Data were analysed using analysis of variance.
  
  
  RESULTS
  The mean bone/implant contact was 9.8 mm for the control and ranged from 9.3 to 11.3 mm for the three test modalities. The corresponding values for area within threads were 1 mm(2) and 1-1.2 mm(2). Modality had a significant effect on both bone/implant contact (F=16.9; P<0.0001) and area within threads (F=16.7; P<0.0001).
  
  
  CONCLUSIONS
  The results of this study suggest that both autogenous bone graft and Bio-Oss played an important role in the amount of hard tissue fill and osseointegration occurring within marginal bone defects around implants.
authors.affiliation: School of Dental Science, Trinity College, Dublin, Ireland.
authors.forename: Faleh
authors.initials: F
authors.lastname: Abushahba
authors.forename: Stefan
authors.initials: S
authors.lastname: Renvert
authors.forename: Ioannis
authors.initials: I
authors.lastname: Polyzois
authors.forename: Noel
authors.initials: N
authors.lastname: Claffey
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001777:Blood Coagulation; D018786:Bone Substitutes / Q000494:pharmacology*; D016025:Bone Transplantation / Q000502:physiology*; D002417:Cattle; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D004285:Dogs; D020007:Implants, Experimental; D008903:Minerals / Q000494:pharmacology; D016348:Osseointegration / Q000187:drug effects / Q000502:physiology; D020390:Tooth Socket
chemical_list: C077540:Bio-Oss; D018786:Bone Substitutes; D015921:Dental Implants; D008903:Minerals