title: Single-staged vs. two-staged implant placement in vertically deficient alveolar ridges using bone ring technique - Part 2: implant osseointegration.
abstract: OBJECTIVE
  The aim of this study was to evaluate the osseointegration of implants placed in a single-staged compared to two-staged procedure using bone ring technique.
  
  
  METHODS
  In this study were used standardized, vertical alveolar bone defects in dogs. In the test group, dental implants (Straumann BL®, Basel, Switzerland) were inserted simultaneously with bone ring technique. As control group served implants inserted 6 months following grafting. Implants of both groups were left for an osseointegration period of 3 and 6 months. The peri-implant bone loss and bone-to-implant contact within the bone ring and native bone were analyzed morphometrically. An explorative statistical analysis was performed.
  
  
  RESULTS
  The peri-implant bone level remained relatively stable within groups and between groups per given time period. Most of bone apposite on the implant surface in two groups was composed of newly formed bone. A nonparametric analysis of variance (ANOVA) revealed no significant advantage for two-staged implant placement for new and total bone, except for residual bone (P = .0084). Furthermore, two groups of implants performed similarly in bone ring and in native bone throughout the observation period.
  
  
  CONCLUSIONS
  In terms of osseointegration, both techniques are likely equally efficient in the present defect model. The single-staged implant placement with cortical bone grafts warrants further documentation in clinical studies.
authors.affiliation: Advanced Research Center, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Nakahara
authors.affiliation: Department of Histology, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
authors.forename: Maiko
authors.initials: M
authors.lastname: Haga-Tsujimura
authors.affiliation: Advanced Research Center, The Nippon Dental University School of Life Dentistry at Niigata, Niigata, Japan.
authors.forename: Kosaku
authors.initials: K
authors.lastname: Sawada
authors.affiliation: Department of Oral and Maxillofacial Surgery, The Nippon Dental University School of Life Dentistry at Niigata, 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: Benoit
authors.initials: B
authors.lastname: Schaller
authors.affiliation: Department of Cranio-Maxillofacial Surgery, Inselspital, Bern University Hospital and University of Bern, Bern, Switzerland.
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 / Q000502:physiology*; 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; morphometric analysis; regeneration; surgical; techniques