The aim was to prospectively and longitudinally study symptoms and signs of temporomandibular disorders (TMD) and occlusal changes in girls with Class II malocclusion receiving orthodontic fixed appliance treatment in comparison with untreated Class II malocclusions and with normal occlusion subjects. Three groups of age matched adolescent girls were examined for symptoms and signs of TMD and re-examined two years later. Additional records were taken in the Orthodontic group during active treatment and one year after treatment. All three groups included subjects with more or less pronounced TMD which showed individual fluctuation during the ongoing study. In the Orthodontic group, the prevalence of muscular signs of TMD was significantly less common post-treatment. Temporomandibular joint clicking increased in all three groups over the two years but was less common in the Normal group. The Normal group also had a lower overall prevalence of TMD than the Orthodontic and the Class II group at both registrations. Functional occlusal interferences decreased in the Orthodontic group but remained the same in the other groups over the two years.
(Rev Esp Ortod. 2010;40(1):005-014)