Abstract
Introduction : A paradigm shift in nonsurgical treatment modality, i.e. fixed functional appliances have been shown to correct the overjet and the Class II molar relationship via a combination of skeletal and dental changes. Aim: To evaluate the skeletal and dental changes using Forsus Fatigue Resistant Device (FRD) (3M Unitek Corp, Monrovia, California, USA) in young adults during Class II correction. Materials and methods: Lateral cephalograms of post leveling and aligning sample (T1) and post Forsus sample (T2) of 10 orthodontically treated young adult patients (CVMI-CS5) with borderline skeletal Class II malocclusion (ANB = 3°-7°) due to mandibular retrognathism, requiring skeletal mandibular sagittal correction were selected. The skeletal and dental treatment changes were analyzed using the Pitchfork analysis (PFA). Results: The PFA showed that the maxilla and mandible moved mesially by 0.3 and 3.2 mm, respectively; the average apical base change was 2.9 mm. The maxillary molar moved distally 0.5 mm, and the mandibular molar moved mesially 1.6 mm. Molar intercuspation changed by 5 mm. The upper incisor moved palatally by 1.5 mm, and the lower incisor moved labially by 2.8 mm. Total overjet change was 6.2 mm. Conclusion: The FRD protocol led to a successful correction of Class II malocclusion with more of skeletal than dental correction. However, more parameters are required to assess the mandibular growth and remodeling of the glenoid fossa.
Published Version
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