title: Implant-supported mandibular overdentures and cortical bone formation: clinical and radiographic results.
abstract: OBJECTIVE
  The aim of this study was to evaluate the hard and soft tissue parameters around implants supporting overdentures and the possible influence of increased periimplant bone density (IPBD) on implant success.
  
  
  METHODS
  A total of 44 dental implants placed in the mandible of 12 patients were included in the study. Implants were divided in 2 groups in relation to the optically detected IPBD. Periimplant clinical and radiographic variables were collected over the period of 5 years.
  
  
  RESULTS
  Periimplant clinical and radiographic parameters for all implants did not change significantly throughout the observation period (P > 0.05). Significant differences were observed between implants with and without IPBD for periimplant soft tissue parameters and Periotest values (P < 0.05). Implants with and without IPBD at 5-year control showed mean bone loss of 0.04 ± 0.48 mm and 0.55 ± 0.96 mm, respectively (P = 0.026). All density values decreased throughout the observation period, except maximal values for implants with IPBD that overcome the initial values at the 5-year control.
  
  
  CONCLUSIONS
  Implants supporting overdentures were clinically successful over the period of follow-up. IPBD may be related to the maintenance of the periimplant bone level.
authors.affiliation: *Research Assistant, Department of Cranio-Maxillofacial Surgery, Bern University Hospital, Bern, Switzerland. †Research Assistant, Department of Oral Surgery, University of Bonn, Bonn, Germany. ‡Associate Professor, Department of Oral Surgery, University of Bonn, Bonn, Germany. §Professor and Head, Department of Oral Surgery, University of Bonn, Bonn, Germany.
authors.forename: Nikola
authors.initials: N
authors.lastname: Saulacic
authors.forename: Marcus
authors.initials: M
authors.lastname: Abboud
authors.forename: Yango
authors.initials: Y
authors.lastname: Pohl
authors.forename: Gerhard
authors.initials: G
authors.lastname: Wahl
mesh_terms: D015519:Bone Density; D003758:Dental Implantation, Endosseous / Q000379:methods*; D017268:Dental Prosthesis Retention / Q000379:methods; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging; D016348:Osseointegration; D011862:Radiography, Panoramic