title: Biomechanical aspects of initial intraosseous stability and implant design: a quantitative micro-morphometric analysis.
abstract: OBJECTIVE
  The objective of this biomechanical study was to explore the effect of bone micro-morphology on initial intraosseous stability of implants with different designs.
  
  
  METHODS
  Straumann and Astra Tech dental implants were placed into anterior and posterior regions of completely edentulous maxilla and mandible of a human cadaver. Experiments were undertaken to quantify initial implant stability and bone micro-morphology. Installation torque values (ITVs) and implant stability quotients (ISQs) were measured to determine initial intraosseous implant stability. For quantification of relative bone volume and micro-architecture, sectioned implant-bone and bone core specimens of each implant placement site were consecutively scanned and trabecular bone was analyzed in a micro-computed tomography (micro-CT) unit. Experimental outcomes were evaluated for correlations among implant designs, initial intraosseous implant stability and bone micro-structural parameters.
  
  
  RESULTS
  ITVs correlated higher with bone volume fraction (BV/TV) than ISQs, at 88.1% and 68.9% levels, respectively. Correlations between ITVs and micro-morphometric parameters were significant at the 95% confidence level (P<0.05) while ISQs were not. Differences in ITVs, ISQs and BV/TV data in regards to implant designs used were not significant at the 95% confidence level (P>0.05).
  
  
  CONCLUSIONS
  Bone micro-morphology has a prevailing effect over implant design on intraosseus initial implant stability, and ITV is more sensitive in terms of revealing biomechanical properties at the bone-implant interface in comparison with ISQ.
authors.affiliation: Division of Restorative Dentistry, The Jane and Jerry Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA, USA. akcak@hacettepe.edu.tr
authors.forename: Kivanç
authors.initials: K
authors.lastname: Akça
authors.forename: Ting-Ling
authors.initials: TL
authors.lastname: Chang
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Tekdemir
authors.forename: Mete I
authors.initials: MI
authors.lastname: Fanuscu
mesh_terms: D000539:Alveolar Process / Q000473:pathology; D015519:Bone Density; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D006801:Humans; D008297:Male; D016348:Osseointegration; D018709:Statistics, Nonparametric; D019415:Torque
chemical_list: D015921:Dental Implants