From the clinical point of view, the difference between osseous and dental antimandibular is as follows: 1. Osseous antimandibular: the patient has obvious abnormalities in jaw development, such as a particularly long jaw development, accompanied by a particularly blunt mandibular angle, which is a very important manifestation of osseous antimandibular. At the same time, the analysis of lateral cranial film, curved section film and 3D CT will show that the patient has overall jaw development incongruity such as underdevelopment of the maxilla, overdevelopment of the mandible, or even imbalance between the two; 2. Dental antimandibular: the patient can’t see any abnormality in the state of closed lips, almost the same as normal people. However, if we observe the state of the patient’s teeth, we will find that the patient may be the state of the ground, at this time, the patient’s jaw coordination is still good, and the jaw angle is basically in the state of normal people. The problem can be solved by correcting the misalignment of the teeth. For bony antimandibles, we may have to combine surgery with orthodontic treatment to solve the problem.