Thermographic assessment of temporomandibular disorders symptomology during orthodontic treatment.

The relationship between orthodontic treatment and temporomandibular disorder (TMD) symptoms has been the focus of many subjective studies. Objective studies are now needed. Electronic thermography (ET) has shown promise as an objective tool for assessing temporomandibular disorders. Clinical TMD examinations and ET were performed on 21 control subjects, 18 subjects undergoing orthodontic treatment, and 20 subjects with TMD pain. Standardized blinded clinical examinations that used algometry were conducted. The ET was performed with an Agema 870 unit (Agema Infrared Systems, Secaucus, N.J.) under controlled conditions. Data were analyzed to determine the usefulness of ET as an objective measure of TMD symptoms. The ET alone identified the subjects with painful clicking TMD with a sensitivity of 87%. Subjects with no painful clicking (controls) were identified with a specificity of 86%. The ET findings also had a strong correlation with pain to muscle palpation. This study indicates that ET shows promise as an objective tool for selecting normal subjects from subjects with TMD symptoms. The ET could prove to be valuable in accessing the relationship between orthodontic treatment and TMD symptoms in future longitudinal studies.