Young girl face, lady look, good wife and good mother to praise the girl’s term is never related to the generous face! The “generous” here does not refer to your attitude, but your “tough” face! The smooth, angular, “three-dimensional” faces favored by girls and boys, and even by mothers-in-law, tend to be those of ethnic minorities, the White Russians of Russia, the Uighurs of Xinjiang, and the Hui, who practice Islam! We, the Han Chinese, a powerful and populous ethnic group, have an ovoid face, and a wide face with a short chin is the most common “universal” shape, which is also known as mandibular angular hypertrophy! Mandibular angle hypertrophy manifests as a square or downward protruding appearance of the face, and even makes the facial contour show a small upper and large lower shape. The degree of jaw angle hypertrophy is affected by a number of factors. At present, there is no uniform standard for the diagnosis of mandibular angle hypertrophy, which is mostly based on the subjective feeling of the autologous candidate; and the evaluation of the surgical effect is too much dependent on the surgeon’s clinical experience, as well as the aesthetic point of view, so it is very difficult for inexperienced maxillofacial surgeons to predict the effect of the post-plastic surgery before the surgery. Mandibular hypertrophy is an aesthetic defect of the upper facial contour of congenital or acquired development. Oriental aesthetics suggests that a melon or oval face shape is more likely to show a woman’s gentleness and serenity. Therefore, women often have the request to change their square face into an oval one. The degree of mandibular angle hypertrophy is affected by many factors, including the angle of the mandibular angle itself, the angle of mandibular body exostosis, as well as the hypertrophy of the biting muscle and even the fullness of the cheeks can affect the width of the lower part of the face, as well as the relative proportionality with the head length and width of the head, and the width of the face in the middle of the face. Some scholars have made statistics on lateral X-ray films of the mandibular angle, and considered that an angle <110° can be diagnosed. Some scholars also believe that orthopantomograms of mandibular angle width is equal to or greater than zygomatic bone width can be diagnosed. Some researchers, based on the X-ray films of mandibular angle hypertrophy, believe that it mainly includes: 1. 2, The mandibular plane angle (MP-FH pinch angle) is smaller than normal. 3, On lateral radiographs, the mandibular angle opening becomes smaller. 4, The lower 1/3 of the facial height is too short. Asymmetric changes. However, these diagnoses for Chinese people are purely from the perspective of the mandible, and do not consider the relative influence of the entire facial structure on the diagnosis of the mandibular angle. The human face emphasizes harmony and unity, and the diagnosis of mandibular angle hypertrophy is the result of a comprehensive consideration of factors in the entire facial contour. It has been noted in the past that the variation in size of the mandibular angle is closely related to the zygomatic bone, as well as to the length of the face and the length and angle of the horizontal branch of the mandible. The angle of the mandibular angle directly reflects the size of the mandibular angle, but this angle alone does not reflect the direction of mandibular protrusion. The angle will become smaller when the mandibular angle protrudes downward or backward with hypertrophy. For this reason, the left and right mandibular elevation angles are used to describe the degree of downward protrusion of the mandibular angle. The more pronounced the downward protrusion of the angle, the smaller the angle of elevation. Combined with the width of the lower jaw and the ratio of the center of the face, the height of the lower part of the face can be comprehensively reflected. However, when describing the hypertrophy of the angle of the lower jaw, it is necessary to combine the spacing between the lower jaws, the head-to-face ratio, and the face-to-middle ratio in order to make a comprehensive judgment. There is no significant difference between men and women in terms of the overall structure of the Han Chinese skull: head length, head width, jaw width, jaw length, jaw angle and related ratios. However, there is a significant difference between men and women in terms of the mid-face width, mandibular angle, and the distance between the nose and chin, which reflect the structure of the middle and lower parts of the face. The ratio of facial and maxillary width (midface width/jaw width) is relatively concentrated at around 1.33 for both sexes. Therefore, the midface width ratio can be used as one of the common diagnostic criteria for mandibular angle hypertrophy in both sexes. When we consider the diagnosis and especially the treatment of mandibular angle, we need to consider the cephalo-facial, mid-facial, and cephalo-mandibular width ratios, and decide the amount of osteotomies (bone grinding) in an overall coordinated consideration. If necessary, temporal augmentation (to increase the width of the middle face) or chin augmentation (to decrease the ratio of the middle face or to increase the angle of elevation of the lower jaw) is also necessary to achieve more effective overall coordination of the maxillofacial region. This point has been increasingly emphasized in clinical practice.