9 months
Due to the significant mesial crown tip of the 46, a hybrid mandibular
archwire technique was implemented (Figure 3). The rigid rectangular
(0.016” × 0.022”) stainless steel archwire ended at the distal aspect
of the 44. A sectional flexible nickel-titanium (0.016”) wire was
placed from the 43 to the 46 and was located underneath the rectangular
steel archwire in the 43 and 44 region. The TAD between the 43 and 44
was connected to the 43 and 44 brackets with a fine stainless steel
ligature wire. This ligature wire, along with the rectangular stainless
steel archwire provided stabilising anchorage for the 43 and 44, as the
reciprocal biomechanical force generated from the uprighting of the
mesially tipped 46 was expected to be significant. These fixed appliance
components provided effective stabilisation to prevent undesirable
movement of the 43 and 44.