Fig. 7
The movement tendency of the upper molars. The coordinate system was centered on each tooth (local coordinate system). In group set I, the 2nd molar demonstrated distal and buccal inclination with extrusion tendency, while the 1st molar presented mesial and buccal inclination with intrusion tendency. In group set II, the 1st molar showed distal and buccal inclination with extrusion tendency, while the 2nd molar demonstrated a tendency for mesial and palatal inclination with little intrusion