Introduction
Although there are numerous methods of analysis for orthodontic treatment, Even the representative analysis that we are familiar with, such as the Down, Steiner, Harvold, Witts, and McNamara analysis, do not mention where it is best to place the occlusal plane in the skeletal structure. But Dr. Jack G. Dale has called the occlusal plane the workbench of orthodontics.

Discussion
When treating a non-growing patient with severe sagittal and vertical skeletal discrepancy who does not want surgery, it is essential to consider whether orthodontists can effectively solve the problem by obtaining the counterclockwise rotation of the mandible. One of the most critical factors in the treatment is the location of the occlusal plane within a given skeletal framework. This is not just a technical detail but a crucial element in achieving aesthetic and functional occlusion, which can significantly improve the quality of life for our patients. Past studies have reported that the occlusal plane is closely related to the orientation of the masticatory muscles. Hoon's arbitrary occlusal plane, established through trial and error, suggests the direction of the occlusal plane to be located when treating patients with sagittal and vertical skeletal discrepancies. Normalizing the occlusal plane in high-angle skeletal class II adult patients as an environmental factor may favor the adaptation and compensation of the mandible throughout life.

Conclusion
This presentation will report on Hoon's arbitrary occlusal plane and, through case studies, explain how it can be effectively implemented in diagnosis and treatment.