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Accuracy of Self-designed 3D-Printed Patient-Specific Surgical Guides and Fixation Plates for Advancement Genioplasty<<<<<<.

AIM
We conducted a prospective study to evaluate the accuracy and complications of 3D-printed patient-specific surgical guides and plates that were designed and finished in-house.


MATERIALS AND METHODS
Eighteen patients who required advancement genioplasty, with or without concomitant orthognathic surgery, were enrolled in the study. Virtual surgical movements were simulated using the patients' cone-beam computed tomography (CBCT) scans, and computer-aided designing of patient-specific surgical guides and fixation plates were performed in our department. CBCT scans were taken at 1 month postoperatively, stereolithographic models of the preoperative virtual plan and the postoperative CBCT were registered. Part comparisons were done to assess the accuracy of the movements. The median, minimum and maximum differences were measured. Two landmarks, the Menton and Pogonion, were also used to compare the differences locally.


RESULTS
The median deviations for the 18 cases was 0.19mm. The median deviation at the Menton and Pogonion were 0.67mm and 0.41mm respectively. There was no significant correlation between the surgical movement of less than 7mm advancement and the transfer accuracy (p = 0.77). No adverse events or complications were reported within post-operative 6 months.


CONCLUSIONS
Our protocol of self-designed 3D-printed patient-specific surgical guides and plates provided an accurate method to transfer the virtual surgical plan to the operating theatre.