Abstract: Abstract: In orthodontic treatment, the occurrence and development of temporomandibular disorder (TMD) is related to some occlusal factors, but the relationship between them is controversial. Besides these, functional occlusion theory on the influence of the temporomandibular joint (TMJ) has become hot spots in the field of stomatology today. This article reviews the relationship between malocclusion and TMD, as well as the application of functional occlusion theory in orthodontic diagnosis and treatment of TMD and related hot issues, providing clinical guidance for the clinical treatment of orthodontic patients with TMD and the consideration of joint problems in orthodontic treatment. Hope that patients can achieve functional occlusion, realize stability of oral and maxillofacial system, and then reduce the occurrence of TMD or alleviate the symptoms of TMD.

Key words: temporomandibular joint, orthodontics;malocclusion, functional occlusion, temporomandibular joint disorder