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With development of orthognathic surgery and inter-disciplinary cooperative treatment, more and more people with skeletal malocclusion may obtain a better physical appearance. 1 However, not only their quality of life, but also their self-confidence may be improved. 2 Unfortunately, there are several potential complications of orthognathic surgery that cannot be neglected in the information to patients considering treatment, for example, numbness, unexpected fractures, bleeding, osteonecrosis, infections and even partial relapse. 3 Injury to the inferior alveolar nerve (IAN) has the highest occurrence of such complications. 3 Injury to the IAN is typically characterised by numbness of the lower lip and mental skin, and has received the most attention both from surgeons and from