title: Measurement of dental implant stability by resonance frequency analysis and damping capacity assessment: comparison of both techniques in a clinical trial.
abstract: OBJECTIVE
  Two noninvasive methods to measure dental implant stability are damping capacity assessment (Periotest) and resonance frequency analysis (Osstell). The objective of the present study was to assess the correlation of these 2 techniques in clinical use.
  
  
  METHODS
  Implant stability of 213 clinically stable loaded and unloaded 1-stage implants in 65 patients was measured in triplicate by means of resonance frequency analysis and Periotest. Descriptive statistics as well as Pearson's, Spearman's, and intraclass correlation coefficients were calculated with SPSS 11.0.2.
  
  
  RESULTS
  The mean values were 57.66 +/- 8.19 implant stability quotient for the resonance frequency analysis and -5.08 +/- 2.02 for the Periotest. The correlation of both measuring techniques was -0.64 (Pearson) and -0.65 (Spearman). The single-measure intraclass correlation coefficients for the ISQ and Periotest values were 0.99 and 0.88, respectively (95% CI). No significant correlation of implant length with either resonance frequency analysis or Periotest could be found. However, a significant correlation of implant diameter with both techniques was found (P < .005). The correlation of both measuring systems is moderate to good. It seems that the Periotest is more susceptible to clinical measurement variables than the Osstell device. The intraclass correlation indicated lower measurement precision for the Periotest technique. Additionally, the Periotest values differed more from the normal (Gaussian) curve of distribution than the ISQs. Both measurement techniques show a significant correlation to the implant diameter.
  
  
  CONCLUSIONS
  Resonance frequency analysis appeared to be the more precise technique.
authors.affiliation: Department of Cranio-Maxillofacial Surgery, University of Bern, Switzerland.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Zix
authors.forename: Stefan
authors.initials: S
authors.lastname: Hug
authors.forename: Gerda
authors.initials: G
authors.lastname: Kessler-Liechti
authors.forename: Regina
authors.initials: R
authors.lastname: Mericske-Stern
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D010474:Percussion; D018709:Statistics, Nonparametric; D014465:Ultrasonics; D014732:Vibration
chemical_list: D015921:Dental Implants