(PR50) Accuracy and Efficiency of a Novel Static Computer-Aided Surgical Technique for Endodontic Microsurgery Using Fully Guided Drill Protocol

This study evaluated the accuracy and efficiency of a novel static computer-aided surgical technique using a 3D-printed surgical guide with a fully guided drill protocol (3D-SG FG) compared to the freehand (FH) technique.

Methods: 46 roots from two cadaver heads were divided into two groups: 3D-SG FG (n=23) and FH (n=23). CBCT scans were taken pre- and postoperatively. The endodontic microsurgery (EMS) was planned in Blue Sky Bio software, and 3D-SG was designed and 3D printed. The osteotomy and RER were conducted with guided twist drill diameter of 2 mm and an ascending tapered drill with diameters of 2.8/3.2, 3.2/3.6, 3.8/4.2, and 4.2 mm with respect guided drill guides. 2D- and 3D-virtual deviations and angular deflection (AD) were calculated. Osteotomy measures and root resection angle were obtained. The osteotomy and RER time and the number of mishaps were recorded. T-test, Mann–Whitney rank sum test, and Fisher’s exact test were used.

Results: 2D- and 3D-accuracy deviations and AD were lower in the 3D-SG FG protocol than in the FH (p <.05). The height, length, and depth of the osteotomy and root resection angle were less in the 3D-SG FG protocol than in the FH (p <.05). The osteotomy and RER time with the 3D-SG FG protocol were less than the FH (p <.05).

Conclusions: This study successfully introduced a new 3D-SG FG drill protocol for EMS. The 3D-SG FG drill protocol showed higher accuracy than the FH method. The 3D-SG FG drill protocol significantly reduced the surgical time.