Sagittal changes in temporomandibular joint disc position over time in adolescents: A retrospective study

Temporomandibular joint (TMJ) disc displacement is a mechanical condition in which the articular disc does not present a normal contact with the articular surfaces due to a change in its position. Magnetic resonance imaging (MRI) is a valid and reliable method to identify TMJ disc displacement. There are no longitudinal MRI studies evaluating if disc displacement progresses over time. The aim of this retrospective study was to provide such answer. TMJ MRIs from a sample of 94 adolescent patients were obtained at two different points in time. Articular disc position was measured at both times and statistically compared for sagital changes in position with respect to the condyle and articular eminence. This study found that sagittal disc position changed over time in approximately 10% to 14% of our total sample. TMJ pain, gender and history facial trauma did not present a clear association with the amount of disc displacement.