In-house protocol for fully guided zygomatic implant surgery and prosthesis repositioning A technical note

Aim: The present study aims to describe an in-house protocol for fully guided zygomatic implant surgery and prosthesis repositioning. Materials and methods: Four extramaxillary zygomatic dental implants (ZIs) were placed in one patient. The preoperative phase included digital planning, through which a surgical guide was designed and created. The analysis of the accuracy of guided surgery and the guided prosthesis repositioning was carried out by superimposing the digital planning with the final postsurgical implant positioning through CbCT. The radiologic evaluation included implant angular deviation, entrance and exit deviation, platform deviation, and apex apicocoronal and mesiodistal deviation. The prosthetic evaluation was performed in three directions: buccopalatal, apicocoronal, and mesiodistal. Results: All the ZIs successfully osseointegrated after 3 months of healing, with no complications. The mean axial angular implant deviation was 0.52 +/- 0.36 degrees, and the mean implant depth deviation was 0.47 +/- 0.28 mm. The entrance and exit deviation of the implants was 0.74 +/- 0.42 mm and 0.7 +/- 0.43 mm, respectively. The virtual prosthesis was superimposed and compared with the standard tessellation language file of the provisional polymethyl methacrylate prosthesis at the level of the first molars and central incisors; the mean buccopalatal deviation was 0.6 +/- 0.035 mm, the mean apicocoronal deviation was 0.65 +/- 0.11 mm, and the mean mesiodistal deviation was 0.3 +/- 0.07 mm. Conclusions: According to the results obtained in this first case of the present case series, careful and meticulous digital planning based on the correct pros-thetic parameters can safely guide the performance of surgery.