Clinical Oral Implants Research

Volume 13 Issue 1, Pages 59 - 64

Published Online: 5 Mar 2002


computer-aided surgery • implant dentistry • accuracy • mutual information matching

Evaluation of accuracy of computer-aided intraoperative positioning of endosseous oral implants in the edentulous mandible

Felix Wanschitz 1 , Franz Watzinger 1 , Christian Schopper 1 , Rolf Ewers 1 , Wolfgang Birkfellner 1 , Michael Figl 2 , Helmar Bergmann 2, 4 , Sanda Patruta 3 Franz Kainberger 5 Joachim Kettenbach 6 1 Department of Oral and Maxillofacial Surgery, University of Vienna, General Hospital Vienna 2 Department of Biomedical Engineering and Physics, University of Vienna, General Hospital Vienna , 3 Dental School, University of Vienna , 4 Ludwig-Boltzmann Institute of Nuclear Medicine, Vienna , 5 Department of Radiology, Division of Osteoradiology, University of Vienna, General Hospital Vienna , 6 Department of Radiology, Division of Angiography and Interventional Radiology, University of Vienna, General Hospital Vienna, Vienna, Austria Correspondence to: Felix Wanschitz, Department of Oral and Maxillofacial Surgery University of Vienna General Hospital Waehringer Guertel 18–20 A-1090 Vienna Austria Tel: +43 1 40400 4259 Fax: +43 1 40400 4253 e-mail:

ABSTRACT Abstract: The overall accuracy of a novel surgical computer-aided navigation system for placement of endosseous implants was evaluated. Five dry cadaver mandibles were scanned using high resolution computed tomography (HRCT). The position of four interforaminal dental implants was planned on the computer screen and transferred to the cadaver mandibles using VISIT, a surgical navigation software developed at the Vienna General Hospital. The specimens were HRCT-scanned again to compare the position of the implants with the preoperative plan on reformatted slices after matching of the pre- and postoperative data sets using the mutual information technique. The overall accuracy was 0.96±0.72 mm (range 0.0–3.5 mm). No perforation of the mandibular cortex or damage to the mandibular canal occurred. We conclude that computer-aided implant surgery can reach a level of accuracy where further clinical developments are feasible.

Article rédigé par le praticien le 06/07/2009