Navigational precision of drilling tools preventing damage to the mandibular canal

Citation
A. Gaggl et al., Navigational precision of drilling tools preventing damage to the mandibular canal, J CRAN MAX, 29(5), 2001, pp. 271-275
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Dentistry/Oral Surgery & Medicine
Journal title
JOURNAL OF CRANIO-MAXILLOFACIAL SURGERY
ISSN journal
1010-5182 → ACNP
Volume
29
Issue
5
Year of publication
2001
Pages
271 - 275
Database
ISI
SICI code
1010-5182(200110)29:5<271:NPODTP>2.0.ZU;2-2
Abstract
Purpose: The use of CT-based intraoperative navigation has greatly improved surgical control in many specialities. In this study the precision of the SMN(R) system (Zeiss, Oberkochen, Germany) for navigated drilling before im plant insertion is evaluated. Material and Method: One hundred test drillin gs were carried out on 10 standardized acrylic lower jaw models with the ai d of the navigation system after CT scanning. The CT scans were taken using a slice thickness of I min. Then the CT data were transferred to the works tation of the SMN(R) system and referentiation with the help of reference p oints (fiducials) of the mandibular models for superposition of the acrylic and the CT models were carried out. Referentiation of the model and the dr illing were performed by a drilling tool. The limit of drilling was the upp er border of the mandibular canal. The aim was to come as near as possible without perforation of the canal roof. Results: An average drilling depth o f 6.23 mm. and a mean distance to the mandibular canal of 0.14 mm (s=0.05) was found. In 11 cases the upper border of the canal was perforated. The av erage penetration of the mandibular canal measured 0.19 mm. Eighty-nine dri ll holes were accomplished without perforation. The average distance to the alveolar canal measured 0.13 mm. Conclusion: A high precision of CT-based navigation for controlled drilling of mandibles for dental implants was see n. (C) 2001 European Association for Cranio-Maxillofacial Surgery.