New study to test which surgical guide works best for jaw realignment

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age ranged from 18 to 40 years old. 2. Patients were diagnosed with dentofacial deformity and received treatment at the Plastic Surgery Hospital, Chinese Academy of Medical Sciences. The diagnosis was confirmed via comprehensive evaluation by two senior attending plastic surgeons. 3. Patients were scheduled for bimaxillary orthognathic surgery, with optional adjunctive procedures including maxillary and mandibular subapical osteotomy and genioplasty. 4. Patients were indicated for the surgery-first approach based on joint assessment by craniomaxillofacial surgeons and orthodontists. Orthodontists confirmed that satisfactory occlusal relationships could be achieved through postoperative orthodontic treatment. Preoperative dental conditions met the following requirements: no or mild anterior dental crowding, flat or shallow Spee's curve, slight incisor inclination, harmonious maxillary and mandibular dental arches, and at least three stable occlusal contacts under transitional occlusion. 5. Patients agreed to complete follow-up examinations and provided signed informed consent. Exclusion Criteria: 1. Patients who refused to participate in the present study. 2. Presence of comorbidities that may increase surgical risks or impair surgical outcomes, as assessed by two senior plastic surgeons, including but not limited to hypertension, diabetes, immune thrombocytopenic purpura, and hemoglobin (Hb) level ≤ 100 g/L. 3. Presence of body dysmorphic disorder, a history of psychiatric disorders, or excessively demanding patients with unrealistic treatment expectations. 4. Presence of facial skeletal tumors. 5. Patients who required revision surgery after previous orthognathic procedures. 6. Cases judged unable to achieve stable occlusal relationships through postoperative orthodontic treatment following joint evaluation by craniomaxillofacial surgeons and orthodontists, including patients with severe dental crowding, maxillomandibular arch width discrepancy, temporomandibular joint disorders, or periodontal diseases.