Comparing 2 cone beam computed tomography devices for the transfer accuracy of a laboratory-based guided surgery system in vitro

Purpose: Using surgical templates for guided placement increases accuracy and decreases patient's discomfort, therefore optimizing the functional, aesthetic, and prosthetic outcomes. Cone Beam computed tomography (CBCT) devices differ in their resolution and geometric accuracies and have been recently demonstrated to influence the measurements of guided surgery. The study aim is to investigate the potential influence of CBCT device selection on the transfer accuracy of guided surgery. Materials and Methods: Thirty-two Straumann implants placed in 8 acrylic models were implanted using digital planning and guided surgery. Preoperative and postoperative CBCT scans of 2 different devices (AccuiTomo 170, Morita and NewTom 5G; QR Verona) were made. Post-op implant position was compared with the digital planning and linear and angular deviations at the implant tip and base were compared between both devices. Results: Mean linear and angular deviations were (0.53 mm/0.96 degree) and (0.66 mm/1.04 degree) for the Newtom and AccuiTomo, respectively. The differences were statistically insignificant (P = 0.615). Conclusion: In our sample, CBCT device selection did not influence the transfer accuracy of guided surgery. More research is needed to evaluate the accuracy of other systems