PURPOSE: The purpose of this study was to assess the accuracy of implant placement after virtual planning of implant positions using cone-beam CT data and surgical guide templates, and to match the results with those achieved with the conventional free-hand method. MATERIALS AND METHODS: Twenty-three implants were placed in 10 patients with a Kennedy Class II with 3-dimensional (3-D) planned surgical guide template. Manual implantation was performed in anatomical casts of the same patients by a prosthodontist and a maxillofacial surgeon. Postoperative images of casts were superimposed onto the preoperative image of virtual planned ideal position of the implant. RESULTS: The 3-D surgical guide template produced significantly smaller variation between the planned and actual implant positions at the implant shoulder (0.9 mm (0-4.5)) and apex (0.6-0.9 mm (0.0-3.4)) compared with the free-hand implantation (2.4-3.5 mm (0.0-7.0); p=0.000 and 2.0-2.5 mm (0.0-7.7); p=0.002). Accuracy of axis was also significantly improved. CONCLUSIONS: Accuracy of implant placement after virtual planning of implant position using cone-beam CT data and surgical templates is high and significantly more accurate than free-hand insertion. The demonstrated method of superimposing radiographic images of postoperative casts and virtual planning images is a useful method, which allows reduced patient radiation exposure.
PURPOSE: The purpose of this study was to assess the accuracy of implant placement after virtual planning of implant positions using cone-beam CT data and surgical guide templates, and to match the results with those achieved with the conventional free-hand method. MATERIALS AND METHODS: Twenty-three implants were placed in 10 patients with a Kennedy Class II with 3-dimensional (3-D) planned surgical guide template. Manual implantation was performed in anatomical casts of the same patients by a prosthodontist and a maxillofacial surgeon. Postoperative images of casts were superimposed onto the preoperative image of virtual planned ideal position of the implant. RESULTS: The 3-D surgical guide template produced significantly smaller variation between the planned and actual implant positions at the implant shoulder (0.9 mm (0-4.5)) and apex (0.6-0.9 mm (0.0-3.4)) compared with the free-hand implantation (2.4-3.5 mm (0.0-7.0); p=0.000 and 2.0-2.5 mm (0.0-7.7); p=0.002). Accuracy of axis was also significantly improved. CONCLUSIONS: Accuracy of implant placement after virtual planning of implant position using cone-beam CT data and surgical templates is high and significantly more accurate than free-hand insertion. The demonstrated method of superimposing radiographic images of postoperative casts and virtual planning images is a useful method, which allows reduced patient radiation exposure.
Authors: Pedro Cunha; Miguel A Guevara; Ana Messias; Salomão Rocha; Rita Reis; Pedro M G Nicolau Journal: Int J Comput Assist Radiol Surg Date: 2012-12-02 Impact factor: 2.924