There is a tendency to believe that torque is introduced into the dentition by rectangular wires only, but this is not so.
During early leveling procedures with round wires, torque changes occur, especially among anterior teeth. These actually begin to produce favorable torque changes in the case, before placement of rectangular wires. The flexibility of 1 IAN'F wires allows for early placement. This allows earlier torque control than was possible when only steel wires were available.
Rectangular steel .019/.025 wires typically follow the rectangular HANT wires (p. 111). These rectangular steel wires are normally placed fiat, without introducing torquing bends or any archwire curves. After they have been in place for at least 6 weeks, torque bends and archwire curves can be added to rectangular steel wires as necessary. Lip to 20° of palatal root torque can be introduced into the upper wire in the incisor area, and 10° to 15° of labial root torque can be introduced into the incisor area of the lower wire (Fig. 6.15). These torque changes contribute to the bite-opening process.
Fig. 6.13 Leveling of the curve of Spee in the lower arch is difficult if the lower second molars are not included. Inclusion of the second molars assists in incisor intrusion and correction of the overbite, together with complete leveling of the curve of Spee.
Fig. 6.15 Rectangular steel wires are normally placed flat. After they have been in place for at least 6 weeks, upper palatal root torque and lower labial root torque can be introduced into the wires, as shown above.
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