RESUME: Objective: To test the null hypothesis that there isn´t difference between mandibular rotation and angular remodeling in adeno-/tonsillectomised children due to severe obstruction (T&A), severe obstructed mouth-breathing children (MB) and nasal-breathing children (NB). PATIENTS AND METHODS: The sample included 38 T&A (mean age 6.56 years), 56 MB (mean age 6.11 years) and 56 NB (mean age 7.92 years). The cephalograms of each subject at baseline (T0) and after 1 year (T1) were traced, and superimpositions were performed to determine the mandibular true rotation, apparent rotation and angular remodeling. RESULTS: NB children showed a counterclockwise mandibular true rotation slightly larger to T&A children (NB-1.26 vs. T&A-0.96) and greater than MB (-0.66), but such difference didn´t have statistical difference. All children presented similar counterclockwise mandibular apparent rotation (T&A-0.43 vs. NB-0.43 vs. MB-0.48), and without statistical difference. T&A and NB children underwent more angular remodeling in comparison with MB (T&A-0.62 vs. NB-0.85 vs. MB-0.19), but again no statistical difference was found. CONCLUSIONS: The present investigation failed to reject the null hypothesis that T&A children have the same pattern of mandibular rotation and angular remodeling as the NB and MB controls. T&A children showed, after 1 year of surgical normalization of the mode of breathing, the same rate of mandibular rotation as NB. Despite T&A children have presented a larger counterclockwise mandibular rotation and three folds the angular remodeling in comparison with MB children, such differences did not show statistical differences.