Evaluation of the fidedignity of Cone beam computed tomography for use in implantodonty guided surgery

Guided surgery is a technique of virtual planning of placement of dental implants that allows greater precision and reliability for the surgeon, allowing less patient morbidity. However, there are errors and distortions during the process, which can result in deviations in implant placement. Objective: to assess the reliability of concomitant computed tomography for use in guided surgery by comparing the actual measurements of the specimens with those obtained by conical beam tomography to identify distortions and quantify them. Methodology: three specimens positioned for tomography were used. 180 measurements were performed with a digital caliper, and then, submitted to computed tomography of beams. After obtaining the images, the points were measured on the tomography and the values obtained in the test specimen and those of the tomography were compared and analyzed. Results: in 80% of the measurements, the tomography was overestimated and in 18.33%, it was lower. In one measurement (1.67%), the means of the test specimens and the printed tomography were the same. In the anterior region, the difference between the measurements of the printed tomography and the test specimen was 0.45mm, in the posterior region it was 0.34mm, on average. Conclusion: conebeam computed tomography is a reliable tool as long as the margins of error are observed. The acquisition of images is only one of the stages of guided surgery, which presents cumulative errors that can compromise the final result if not observed and circumvented by the experience of the surgeon. (author)