I looked through the original post I saw. Jun Guo, Department of Plastic Surgery, Yangzhou First People's Hospital: The mandibular margin (that is, the original margin of resection) has obvious calcification. This is the normal repair process of human body after bone cutting, which is completely normal. Without this phenomenon, the mandible has poor ability to withstand lateral blows and is prone to fracture. As for the ligaments on both sides, they are completely calcified. Temporomandibular joint has three ligaments, namely pterygomandibular ligament, sphenomandibular ligament and styloid mandibular ligament. There is no possibility of injury of these three ligaments in mandibular surgery through oral approach. From the X-ray film, there are two obvious white lines. It may be the density change of the lateral mandibular masseter muscle. Increasing the density can display dense images on X-ray film. Reasons: Many doctors put on bandages immediately instead of placing negative pressure drainage after operation, which leads to the long-term drainage of hematoma is not clean, secondary infection or aseptic inflammation on the basis of residual hematoma, and hematoma is gradually replaced by fibrous tissue, completing the deep tissue scarring process, which is called "mechanization" in medicine. In the later stage, the elasticity and contraction function of masseter muscle decreased, which affected the mouth opening movement. The medical term is "ankylosis outside temporomandibular joint". Effective measures to avoid this consequence: First, minimize intraoperative trauma, especially reduce the amount of bleeding. The second is to prevent the effective negative pressure drainage device from completely draining and blocking after operation. Third, after the drainage tube is pulled out, there will still be a very small amount of congestion. At this time, patients must be encouraged to do more local physical therapy and hot compress to promote hematoma regression. Of course, another disease that is most easily confused with this symptom is temporomandibular joint disorder syndrome, which needs to be differentiated.