Fig. 9

For extrusion of the right maxillary central incisor (a), the force system (b) would provide the desired result (c).For extrusion of the two maxillary central incisors (d), the force system (e) would provide inadequate results (f)
For extrusion of the right maxillary central incisor (a), the force system (b) would provide the desired result (c).For extrusion of the two maxillary central incisors (d), the force system (e) would provide inadequate results (f)