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Objective: Evaluate the changes in the mandibular condyle volume and shape in growing Class II malocclusion patients, following the use of fixed functional Class II appliances (Forsus and Advacsync II). CBCT images were used to help understand which appliance might cause more changes. Methods: Twenty growing adolescent patients were randomly allocated to Two groups (Forsus and Advancesync II). A total of fourty CBCT images were taken pre- and posttreatment. The pre- and posttreatment CBCT images were segmented using a newly developed and validated semiautomatic condylar segmentation technique. and the quantitative assessment of the mean distance differences of the condyle surfaces was de using Iterative Closest Point technique. Results: A statistically significant increase in condylar volume was observed in both groups (Forsus and Advancesync II) and no significant differences in the magnitude of condylar volumes between both groups were found. There were no statistically significant changes in the mean distance differences of the condyles shape in both groups.Both groups (Forsus and Advancesync II) expressed different patterns of shape changes with no clear pattern associated with the treatment groups.

Objectives: to compare dental and skeletal effects produced by Forsus Fatigue Resistance Appliance and Advancesync II Appliance in patients with class II malocclusion. Patients and methods: The current study was conducted on 20 orthodontic patients with an age range from 14- to 16-year-old who were collected from the outpatient clinic at Orthodontic Department, Faculty of Dental Medicine, Al-Azhar University, Assiut, Egypt. They were separated at random into two equal groups; each consisted of 10 patients, Group 1: Patients treated with molar to canine fixed functional appliance. Group 2: Patients treated with molar to molar fixed functional appliances. Results: results showed non statistically significant difference between both groups. Conclusion: a statistically significant differences were found in dentoalveolar parameters with statistically non significance difference in skeletal parameters.