Abstract: Objective To explore the effect of low-temperature impact therapy in relieving postoperative swelling after facial bone contouring. Methods A total of 12 patients with an average age of（ 21.75±3.39） years who underwent bilateral mandibular angle ostectomy from October to November 2022， were included in this study. A split-mouth design was adopted， and the experimental side was determined by random sequence method， and the opposite side was used as the control side. All patients received routine postoperative care， and the experimental side received additional low-temperature impact therapy. The facial structure was recorded by a 3-dimensional laser scanner pre- and postoperatively. Geomagic Studio was used for alignment， visualization， and quantification of the swelling. The largest deviation value was adopted to assess the overall swelling. The 24-hour blood drainage volume and the incidence of postoperative complications were recorded. Results No skin necrosis or other complications occurred in all patients. The maximum swelling degree of the experimental group was lower than that of the control group on the 2nd， 3rd and 7th day after surgery， the difference was significant（ P<0.05）. There was no significant difference between the two groups in terms of drainage volume. Conclusion Low-temperature impact therapy is safe and effective in relieving postoperative swelling， which provides an effective auxiliary way of usual care after facial bone contouring.

Key words: Low-temperature impact therapy, &emsp, Facial bone contouring, &emsp, Prominent mandibular angle, &emsp, Facial swelling, &emsp, Split-mouth design