Abstract: Objective: To explore the clinical application of computer aided navigation in removal of foreign bodies in the oral and maxillofacial regions and evaluate the clinical effect. Methods: From January 2014 to December 2016, 5 patients with foreign bodies in oral and maxillofacial regions were treated at Nanjing Stomatological Hospital. Preoperative CT or CBCT scanning were undertaken for all patients and the scanning data were imported to computer aided navigation system as digital imaging and communication in medicine (DICOM) for 3D reconstruction. The data were used for preoperative planning and intra-operative navigation. The clinical effect was evaluated by observing the accuracy of intra-operative navigation, the operation time, and the postoperative condition of patients. Results: With the computer aided navigation, a total of 28 foreign bodies were found in 5 cases, including 5 glass fragments, 16 splinters, and 7 metals. One metal fragments could not be accurately located due to the loose of navigation reference frame. After re-fixed the reference frame, all foreign bodies were removed by minimally invasive access without any complications, the accuracy of computer aided navigation was less than 1mm, and the operating time was shorten. Conclusion: Computer aided navigation technology not only can accurately locate the foreign body in maxillofacial region, but also reduce the operation time and the postoperative complications, increase the accuracy and safety of surgery. Computer aided navigation had significant clinical values in the removal of foreign bodies in the oral and maxillofacial regions.

Key words: Oral and maxillofacial , Foreign body , Computer aided navigation