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Long-term outcomes of mandibular kinematics following class II malocclusion therapy with removable functional appliance therapy |
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| Authors: | Sabine S Linsen Michael Wolf Dieter Müßig |
| Institution: | 1. Department of Prosthodontics, Preclinical Education and Dental Materials Science, University Hospital Bonn, Bonn, Germany;2. Department of Orthodontics, University Hospital Bonn, Bonn, Germany;3. Department of Orthodontics, Danube Private University, Krems-Stein, Austria |
| Abstract: | Objective: To evaluate mandibular kinematics in class I adults following class II therapy with removable functional appliances (RFAs) during the growth period in comparison with orthodontically untreated class I and II individuals. Methods: Condylar (CRoM) and incisal range of motion (InRoM), velocity during opening and closing, and the mandibular rotation angle were recorded using an ultrasound-based jaw-tracking system in 36 test patients (mean age = 28.03 ± 6.58 years). Results: Significant group effects were found for CRoM towards the posterior in the right joint (p = 0.002) and InRoM towards the anterior (p = 0.043). The post hoc Tukey test indicates a significantly longer CRoM (posterior) for the right condyle in class II (p = 0.003) and RFA individuals (p = 0.023). Discussion: The kinematic data imply greater dentoalveolar effects due to RFA therapy than adaptive remodeling of the temporomandibular joint. The class I relationship in the RFA group following treatment indicates stable long-term outcomes. |
| Keywords: | Mandibular kinematics Class I Class II Removable functional appliance Orthodontic long-term outcome Condyle position |