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Abstract : This study aimed to investigate short-term outcomes of hard- and soft tissue changes induced by modified removable mandibular retractor appliance in Class III patients and compare them to those of conventional removable mandibular retractor appliance. The sample included 40 patients, their ages ranged between 7-9 years, who were randomly divided into two groups: Group1: Twenty patients treated with a modified mandibular removable retractor device(M-RMR). Group 2: Twenty patients treated with a conventional mandibular removable retractor device (RMR). All patients had skeletal class III with crossbite on at least two anterior teeth. Cephalometric images were performed for each patient before applying the device T1, and after obtaining a positive overjet (2-3) mm T2, the changes between (T1-T2) were studied for each group. Then the results were compared between the two groups. The results showed better sagittal progression of the maxillary in the M-RMR group compared to the traditional RMR. slight increase in the vertical dimension of the face in both devices, and a noticeable improvement of the soft tissues in both devices. The modified mandibular retractor device showed effective treatment of skeletal class III. The presence of the lip- pads was very effective in maxillary protrusion.