title: A biomechanical assessment of the relation between the oral implant stability at insertion and subjective bone quality assessment.
abstract: OBJECTIVE
  The study was set to evaluate the validity of subjective jaw bone quality assessment.
  
  
  METHODS
  A total of 298 patients (198 females, mean age 56.4) were treated with oral implants at the Periodontology Department at the University Hospital of KUL. A total of 761 TiUnite implants have been installed. Subjective bone quality assessment was performed on radiographs and by the surgeon's tactile sensation and was compared with torque measurements. In a subset of patients, implant stability was also assessed by implant stability quotient and/or periotest values.
  
  
  RESULTS
  Subjective assessment of bone quality was related to the PTV, ISQ and placement torque [in the crestal, the second and the apical third (N cm)], respectively; in grade 1: -5.3, 73.3 (4.2, 9.6, 15.2), and grade 3 or 4: -1.6, 55 (3.3, 5.5, 8.4). For the surgeon's tactile sensation, a good correlation was noted for the presence of a thick cortex: -4.6, 70.3 (4.2, 9.7, 15.1), or a thin one: -0.3, 65.9 (3.6, 6.9, 10.1). For dense trabecular bone, the values were -2.8, 69.4 (4.4, 9.7,14.8), while for poor trabecular bone, the values were-1.7, 66.4 (3.6, 6.4, 9.8).
  
  
  CONCLUSIONS
  Subjective assessment of bone quality is related to PTV, ISQ and placement torque measurements at implant insertion.
authors: Department of Periodontology, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Faculty of Medicine, Catholic University of Leuven, Leuven, Belgium.
authors: Ghada
authors: G
authors: Alsaadi
authors: Marc
authors: M
authors: Quirynen
authors: Katleen
authors: K
authors: Michiels
authors: Reinhilde
authors: R
authors: Jacobs
authors: Daniel
authors: D
authors: van Steenberghe
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015519:Bone Density; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis; D005260:Female; D006244:Hardness; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D018709:Statistics, Nonparametric; D019415:Torque; D014110:Touch; D014732:Vibration
chemical_list: D015921:Dental Implants