title: Single-staged vs. two-staged implant placement using bone ring technique in vertically deficient alveolar ridges - Part 1: histomorphometric and micro-CT analysis.
abstract: BACKGROUND
  Simultaneous implant placement with bone grafting shortens the overall treatment period, but might lead to the peri-implant bone loss or even implant failure. The aim of this study was to compare the single-staged to two-staged implant placement using the bone ring technique.
  
  
  METHODS
  Four standardized alveolar bone defects were made in the mandibles of nine dogs. Dental implants (Straumann BL®, Basel, Switzerland) were inserted simultaneously with bone ring technique in test group and after 6 months of healing period in control group. Animals of both groups were euthanized at 3 and 6 months of osseointegration period. The harvested samples were analyzed by means of histology and micro-CT.
  
  
  RESULTS
  The amount of residual bone decreased while the amount of new bone increased up to 9 months of healing period. All morphometric parameters remained stable between 3 and 6 months of osseointegration period within groups. Per a given time point, median area of residual bone graft was higher in test group and area of new bone in control group. The volume of bone ring was greater in test than in control group, reaching the significance at 6 months of osseointegration period (P = 0.002).
  
  
  CONCLUSIONS
  In the present type of bone defect, single-staged implant placement may be potentially useful to shorten an overall treatment period.
authors.affiliation: Advanced Research Center, School of Life Dentistry at Niigata, The Nippon Dental University, Niigata, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Nakahara
authors.affiliation: Department of Histology, School of Life Dentistry at Niigata, The Nippon Dental University, Niigata, Japan.
authors.forename: Maiko
authors.initials: M
authors.lastname: Haga-Tsujimura
authors.affiliation: Advanced Research Center, School of Life Dentistry at Niigata, The Nippon Dental University, Niigata, Japan.
authors.forename: Kosaku
authors.initials: K
authors.lastname: Sawada
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Life Dentistry at Niigata, The Nippon Dental University, Niigata, Japan.
authors.forename: Eizaburo
authors.initials: E
authors.lastname: Kobayashi
authors.affiliation: Department of Cranio-Maxillofacial Surgery, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland.
authors.forename: Matthias
authors.initials: M
authors.lastname: Mottini
authors.affiliation: Department of Cranio-Maxillofacial Surgery, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland.
authors.forename: Benoit
authors.initials: B
authors.lastname: Schaller
authors.affiliation: Department of Cranio-Maxillofacial Surgery, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland. nikola.saulacic@insel.ch.
authors.forename: Nikola
authors.initials: N
authors.lastname: Saulacic
mesh_terms: D016301:Alveolar Bone Loss / Q000473:pathology / Q000601:surgery; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000818:Animals; D016025:Bone Transplantation / Q000379:methods*; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D004285:Dogs; D008297:Male; D008334:Mandible / Q000637:transplantation; D016348:Osseointegration; D010027:Osteotomy; D012886:Skull / Q000637:transplantation; D013524:Surgical Flaps; D055114:X-Ray Microtomography
chemical_list: D015921:Dental Implants
keywords: animal experiments; bone implant interactions; bone regeneration; guided tissue regeneration; surgical techniques