Abstract: Objective To assess the accuracy in the immediate rehabilitation of maxillary Brown II defects with prosthesis using a 3D printing osteotomy template. Methods Eight patients with Brown Ⅱ maxilla defect caused by tumor were treated. 3D printing osteotomy template and prosthesis were designed and fabricated before surgery. The immediate rehabilitation was performed under the guidance of osteotomy template with prosthesis. The postoperative three-dimensional images and the preoperative virtual images were superimposed, and average deviation and maximum deviation of entire and local regions were calculated. The software of SPSS 23.0 was used for statistical analysis. Results No recurrence was found in 8 patients during follow-up. The maximum deviation between the actual and virtual surgery was （5.26±0.58） mm, with an average of （1.10±0.25）mm. No significant difference between the actual and virtual surgery was found among entire and local regions (P > 0.05). Conclusion The precise rehabilitation of maxillary Brown II defects can be achieved using a prosthesis fabricated with an osteotomy template. The immediate rehabilitation of maxillary Brown II defects with prosthesis has achieved good clinical results, which provides a guarantee for the immediate rehabilitation and reconstruction of maxilla.

Key words: 3D printing, osteotomy template, prosthesis, instant rehabilitation