Three-Dimensional Repositioning of the Maxilla in Orthognathic Surgery Using Patient-Specific Titanium Plates: A Case Series.

PURPOSE

Successful orthognathic surgery is fundamentally based on accurately carrying out the intended surgical plan intraoperatively. The purpose of this study was to evaluate the accuracy of bone-borne patient-specific maxillary cutting guides and 3-dimensional (3D)-printed plates in repositioning the maxilla during bimaxillary orthognathic surgery.

MATERIALS AND METHODS

This was a retrospective case series consisting of patients who had undergone Le Fort I osteotomy with a patient-specific cutting guide and 3D-printed plate as well as a bilateral sagittal split osteotomy and had 6-week postoperative cone-beam computed tomography studies. The primary outcome variable was the difference between the position of the postoperative maxilla and the virtually planned maxilla measured at 10 landmarks in 3 dimensions. Other study variables included the preoperative diagnosis and planned surgical movement at each landmark. Descriptive statistics were tabulated, and bivariate analyses were performed.

RESULTS

A total of 10 patients were included in this study. The mean age was 25.7 ± 8.1 years, and there were 5 female patients. The median planned surgical movement was 0.350 mm on the x-axis (right-left), 3.750 mm on the y-axis (anterior-posterior), and 1.704 mm on the z-axis (superior-inferior). The median absolute discrepancy between the postoperative position and the planned position on the x-axis, y-axis, and z-axis was 0.638, 0.798, and 0.481 mm, respectively. There was no significant difference in the discrepancies between the x-axis and y-axis (P = .575), x-axis and z-axis (P = .332), and y-axis and z-axis (P = .114).

CONCLUSIONS

Using a patient-specific cutting guide and 3D-printed plate when performing Le Fort I osteotomy allows for accurate 3-dimensional positioning of the maxilla in accordance with the surgical plan.