Anterior open bites can cause both aesthetic and functional issues in patients. Previous research has demonstrated stable results with counterclockwise rotation of the mandible following maxillary molar intrusion, thereby leading to closure of open bites. In this case, a modified transpalatal arch (TPA) was chosen, as the patient declined the use of temporary anchorage devices (TADs). A 15-year-old patient presented with a Class III skeletal profile, an anterior open bite, steep mandibular plane, increased lower facial height, obtuse gonial angle, mandibular anterior spacing and a mild tongue thrust. The use of a fixed TPA was decided since the appliance would help to intrude the maxillary molars, thereby bringing about improved positioning of the chin, increased overbite and a more favourable lower facial height. Utilising a diagnostic modality such as finite element analysis (FEA) for treatment planning can aid in the specific design and placement strategies of appliances for optimal results. The result of the present patient case demonstrates the essential role played by FEA in studying the effects of the placement of a TPA at different positions and using various designs to lead to a successful outcome.