title: Influence of bony defects on implant stability.
abstract: BACKGROUND
  The purpose of this study was to analyze the evolution of implant mechanical stability in different types/sizes of bony defects using both Periotest and Osstell devices as "objective tools."
  
  
  METHODS
  Thirty-two implants were randomly allocated to one of the four types of bone defects: marginal bone loss, peri-apical bone defect, constant width dehiscence and constant length dehiscences. Periotest/Osstell measurements were completed before and during staged bone removal (to enlarge defect size).
  
  
  RESULTS
  Significant differences (P<0.05) with initial values were found after a 2 mm marginal bone removal (Osstell/Periotest); for a peri-apical bone lesion, after removal of 5 mm (Osstell) or 8 mm (Periotest); for a 6-mm-long dehiscence, after removal up to 180 degrees of the implant perimeter (Osstell/Periotest); for a 3-mm-wide dehiscence, after removal of 10 mm (Osstell) or 6 mm (Periotest).
  
  
  CONCLUSIONS
  Periotest and Osstell are in general not very sensitive in the identification of peri-implant bone destruction, except for marginal bone loss.
authors.affiliation: Department of Periodontology, Catholic University Leuven, Leuven, Belgium. joe.merheb@med.kuleuven.be
authors.forename: Joe
authors.initials: J
authors.lastname: Merheb
authors.forename: Wim
authors.initials: W
authors.lastname: Coucke
authors.forename: Reinhilde
authors.initials: R
authors.lastname: Jacobs
authors.forename: Ignace
authors.initials: I
authors.lastname: Naert
authors.forename: Marc
authors.initials: M
authors.lastname: Quirynen
mesh_terms: D016301:Alveolar Bone Loss / Q000473:pathology*; D000539:Alveolar Process / Q000473:pathology; D002102:Cadaver; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D054459:Elasticity Imaging Techniques / Q000295:instrumentation / Q000592:standards; D006801:Humans; D010474:Percussion / Q000295:instrumentation / Q000592:standards; D010486:Periapical Tissue / Q000473:pathology; D010517:Periodontics / Q000295:instrumentation / Q000592:standards
chemical_list: D015921:Dental Implants