Methods and systems for determining an orthodontic treatment for a patient are provided. The method comprises: receiving image data associated with a patient's skull; identifying, based on the image data, a first pair of reference pints; identifying, based on the image data, a second pair of reference points; generating based on the first and second pairs of reference points a first reference line and the second reference line, respectively; determining, based on an intersection of the first reference line and the second reference line, a rotation center of a patient's mandible; and based on the rotations center, determining the orthodontic treatment for the patient.