[Orthognathic surgery].

This chapter covers the diagnosis, assessment, and treatment planning for orthognathic surgery. Pre- and postsurgical orthodontics are described, and surgical management is outlined. Maxillary, mandibular, and chin osteotomies along with various modifications including segmental surgery are explained and illustrated. Subsequently, complications arising from the procedures and their management are explained. The chapter ends with sections on soft tissue changes, stability of postoperative results, distraction osteogenesis, and lastly, obstructive sleep apnoea.