Dental Implants Research Today is a free monthly online journal that collates and summarizes the latest research about Dental Implants, including details on dentistry, surgery, tooth implants.

A biomechanical assessment of the relation between the oral implant stability at insertion and subjective bone quality assessment.

Alsaadi G, Quirynen M, Michiels K, Jacobs R, van Steenberghe D

Department of Periodontology, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Faculty of Medicine, Catholic University of Leuven, Leuven, Belgium.

AIM: The study was set to evaluate the validity of subjective jaw bone quality assessment. MATERIALS AND 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.

Published 23 March 2007 in J Clin Periodontol, 34(4): 359-66.
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