From the morphological point of view, the chin is located in the lower third of the face and is one of the important components of facial aesthetics. Therefore, when performing chin osteotomy, we should not only consider the shape and position of the chin itself, but also take into account the overall proportional relationship between the chin, the angle of the jaw, and the body of the jaw. In particular, for those who require facial bone reduction, it is necessary to take into account both the frontal view of the shape and the lateral view of the continuous flow of the jaw angle, body and chin curve. In the past, not enough attention was paid to this aspect in both chin shaping surgery and mandibular angle osteotomy. Therefore, on the premise of ensuring good blood supply to the distal bone segment after chin osteotomy, it is necessary to explore a chin osteotomy method that is simpler to osteotomy and takes into account the overall coordination of the mandibular angle, body and chin. Based on many years of clinical experience, we designed the surgical method of “retrograde osteotomy of the lower edge of the chin body of the mandible to correct square wide chin deformity”, which can well maintain the natural shape of the chin bone because the lower edge of the chin remains unchanged. For patients with a wide, uncoordinated lower face, this surgery can be performed alone or in conjunction with mandibular angle osteotomy and horizontal chin osteotomy. For patients with a combined wide chin, retrograde osteotomy of the lower edge of the chin body of the mandible (including chin node osteotomy) is performed at the same time as the curved osteotomy of the mandibular angle, which can not only make the osteotomy line of the mandibular body continue smoothly and completely avoid the second mandibular angle, but also achieve a more perfect face shape from the front.
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