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Abstract
This study evaluated skeletal and dentoalveolar changes in Angle Class II malocclusion correction using the Herbst appliance and Forsus Fatigue Resistant Device (Forsus) in two private practices, compared to a matched untreated control group from the AAOF Craniofacial Growth Legacy Collection. Each treatment group included 38 patients treated with fixed appliances and either Herbst or Forsus. Lateral cephalograms were taken pre-treatment (T1) and post-treatment (T2), and 40 cephalometric measurements were analyzed using ANOVA and Tukey tests. At T1, groups were similar except for greater Wits appraisal and maxillary incisor proclination in the Forsus group. From T1 to T2, Herbst treatment produced significantly greater skeletal correction (ANB reduction ≈1.0°), while Forsus showed more dentoalveolar effects. Both appliances restricted maxillary sagittal growth, with Herbst demonstrating a stronger effect (ANB decrease 1.2°, Wits reduction 2.4 mm). These findings highlight differing biomechanical impacts of Herbst and Forsus in Class II correction.