Three-dimensional planning software is not standardized in facial gender-affirming surgery.
Objective:
To develop and validate surgical planning software to create cutting guides to contour the lower jaw border.
Design, Setting, and Participants:
A 3-year prospective case series study done in three phases: software development, validation, and surgical guide application. Ethics committee approval was obtained to enroll the patients (Clinical Research Ethics Committee, Hospital Costa del Sol, Marbella, Spain).
Main Outcomes and Measures:
Validation phase: degree of agreement between the planned and obtained results, modification of cephalometric parameters, and surgical times. Application phase: surgical technique description, complications, and patient-reported outcome measures.
Results:
The degree of agreement between the planned and obtained results was inframillimetric (0.31 ± 0.70 mm). The guides reduced the mandible to within feminine parameters (p < 0.05). Surgical times decreased by 10.96% with chin ostectomies (p < 0.05) and 23.06% with lower jaw border (angle-to-angle) surgeries (p < 0.001). In the application phase, revision surgery was required for 11 patients out of 260 (4.23%).
Conclusions and Relevance:
The use of cutting guides on the lower jaw border is effective, helps reach standard feminine parameters, and decreases surgical times.
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