Objective:To investigate the clinical value of navigation assisted zygomatic implant technique in the repair of bilateral maxillary defects.Methods:Clinical data: from January 2013 to December 2019, patients underwent bilateral subtotal maxillectomy in the Department of Oral and Maxillofacial Head and Neck Oncology, the Ninth People’s Hospital Affiliated to Medical College of Shanghai Jiao Tong University. Inclusion criteria: James Brown’s class Ⅱ patients with bilateral maxillary defect, with oral nasal communication, without residual teeth. Exclusion criteria: patients with zygomatic pathologic involvement or requiring postoperative radiotherapy. The obturator was fitted with the defect by using digital technology and Simplant 3D software, and the implant direction and exposure position of the platform were determined. The bilateral zygomatic implants were implanted under the guidance of Brainlab platform navigation at the same time or in the second stage after tumor resection. Finally, the implant supported obturator was used to repair the maxillary defect. The patients were followed up for 1 year, and the clinical effect was evaluated by obturator functional scale(OFS).Results:A total of 20 patients, 13 males and 7 females, aged from 28 to 72 years, with an average of 53.6 years, were included in this study. A total of 68 zygomatic implants were implanted and 2 of them failed. The osseointegration rate was 97.06%. The repair rate of implant occluder was 90%. By the evaluation of OFS scale, the patients achieved satisfactory result in chewing, pronunciation and appearance.Conclusions:Zygomatic implant can provide decent repair effect for maxillary obturator, and navigation technology can make zygomatic implant accurately implanted into the ideal site.

Objective:To investigate the clinical value of navigation assisted zygomatic implant technique in the repair of bilateral maxillary defects.Methods:Clinical data: from January 2013 to December 2019, patients underwent bilateral subtotal maxillectomy in the Department of Oral and Maxillofacial Head and Neck Oncology, the Ninth People’s Hospital Affiliated to Medical College of Shanghai Jiao Tong University. Inclusion criteria: James Brown’s class Ⅱ patients with bilateral maxillary defect, with oral nasal communication, without residual teeth. Exclusion criteria: patients with zygomatic pathologic involvement or requiring postoperative radiotherapy. The obturator was fitted with the defect by using digital technology and Simplant 3D software, and the implant direction and exposure position of the platform were determined. The bilateral zygomatic implants were implanted under the guidance of Brainlab platform navigation at the same time or in the second stage after tumor resection. Finally, the implant supported obturator was used to repair the maxillary defect. The patients were followed up for 1 year, and the clinical effect was evaluated by obturator functional scale(OFS).Results:A total of 20 patients, 13 males and 7 females, aged from 28 to 72 years, with an average of 53.6 years, were included in this study. A total of 68 zygomatic implants were implanted and 2 of them failed. The osseointegration rate was 97.06%. The repair rate of implant occluder was 90%. By the evaluation of OFS scale, the patients achieved satisfactory result in chewing, pronunciation and appearance.Conclusions:Zygomatic implant can provide decent repair effect for maxillary obturator, and navigation technology can make zygomatic implant accurately implanted into the ideal site.