Condylar Displacement Differences Between Centric Relation And Maximum Intercuspation Before And After Orthodontic Intervention

[Objective]To investigate the effect of orthodontic intervention on maximum intercuspation (MIC)-centric relation (CR) position condylar displacement of the patients with or without temporomandibular disorders (TMD).[Method]Thirty one16-45year-old orthodontic the patients were selected,16of which without TMD constituted group To and15the patients with TMD as group T1. MIC and CR position records were taken before and after orthodontic intervention.[Results]1. MIC-CR displacement of the patients were different between T0and T1.2. MIC-CR displacement of the patients pre-and post-treatment were different in both groups with much more changes in the TMD group (T1), and of which almost were favorable.3. The MIC-CR condylar displacement had something to do with the symptom checklist (SCL) score. Some subjects with existed symptoms or damages obtained reduction after the treatment.[Conclusion]This experiment, to some extent, can indicate that orthodontic intervention make effects on condylar position of the patients, especially for those with TMD. Orthodontists, therefore, need to objectively understand and take notice of the effect on TMJ health of malocclusion as well as the MCD’s function of evaluation in treatment in diagnosis, and should also pay more attention to condylar position in treatment and obtain the functional occlusion, within which the occlusion (MIC) coordinated with condylar position (CR).