Functional Appliance for Orthognathic Surgery

The unstable condylar position in the glenoid fossa is a critical problem for postsurgical instability after mandibular advancement with subsequent mandibular relapse. The habitual forward occlusion in class II patients creates unstable condyle to glenoid fossa relationship making it hard for clinicians to determine the amount of mandibular advancement. Splint therapy is considered as a preoperative reversible nonsurgical condylar repositioning option in addition to its adjunctive effect for pain relief in TMJ symptomatic patients. To minimize this relapse, presurgical functional appliance therapy has been proposed and has shown promising outcomes.