title: Relations between the bone density values from computerized tomography, and implant stability parameters: a clinical study of 230 regular platform implants.
abstract: OBJECTIVE
  The objective of this study was to determine the relationship between bone density, insertion torque, and implant stability at implant placement.
  
  
  METHODS
  One-hundred and eight patients were treated with 230 Brånemark System implants. A computerized tomography (CT) machine was used for pre-operative evaluation of the jaw bone for each patient. The maximum insertion torque values were recorded with the OsseoCare equipment. Implant stability measurements were performed with the Osstell machine for only 142 implants.
  
  
  RESULTS
  The mean bone density and insertion torque values were 721+/-254 Hounsfield unit (HU) and 39.1+/-7 N cm for 230 implants, and the correlation was significant (r=0.664, p<0.001). The mean bone density, insertion torque, and resonance frequency analysis values were 751+/-257 HU, 39.4+/-7 Nc m, and 70.5+/-7 implant stability quotient (ISQ), respectively, for 142 implants. Statistically significant correlations were found between bone density and insertion torque values (p<0.001); bone density and ISQ values (p<0.001); and insertion torque and ISQ values (p<0.001).
  
  
  CONCLUSIONS
  The bone density values from pre-operative CT examination may provide an objective assessment of bone quality, and significant correlations between bone density and implant stability parameters may help clinicians to predict primary stability before implant insertion.
authors.affiliation: Department of Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, OH 43218-2357, USA. turkyilmaz.1@osu.edu
authors.forename: Ilser
authors.initials: I
authors.lastname: Turkyilmaz
authors.forename: Celal
authors.initials: C
authors.lastname: Tumer
authors.forename: Esma Nida
authors.initials: EN
authors.lastname: Ozbek
authors.forename: Tolga F
authors.initials: TF
authors.lastname: Tözüm
mesh_terms: D000539:Alveolar Process / Q000000981:diagnostic imaging*; D000704:Analysis of Variance; D015519:Bone Density; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed; D019415:Torque
chemical_list: D015921:Dental Implants