Biteopening curves

The authors prefer not to place bite-opening curves in round wires or to have such curves built into rectangular heat-activated wires. They accept the fact that such wires do not complete the leveling of the arches and the bite-opening process. In the great majority of cases alter rectangular stainless steel wires have been in place for 6 weeks, the arches are normally level and adequate bite opening has been achieved. If this is not so, then bite-opening curves can be placed into the rectangular steel wires.

Placing a bite-opening curve in the upper archwire increases palatal root torque to the upper incisors. This is beneficial in the majority of cases and it is usually unnecessary to add any additional torque bends to this upper wire, but is sometimes needed (Pig. 7.185, p. 210).

When bite-opening or reverse curve is placed in the lower rectangular steel wire, the result is proclination of lower incisors. This is generally not indicated. Therefore, before placement of a bite-opening curve in the lower wire, approximately 10° to 15° of labial root torque can be added. After this, bite-opening curves can be placed and the net effect will be a retroclining and intrusive force on the lower incisors (Fig. 6.16).

Fig. 6.16 If necessary, bite-opening curves can be placed in upper and lower rectangular steel wires after the wires have been in place for 1 or 2 months. The lower wire needs to be flat (no torque) in the incisal region to prevent proclination of lower incisors. Both archwires are normally flat (no torque) in the molar regions, unless there is a need for molar torque changes. Approximately 3-4 mm of reverse curve is appropriate if the second molars are included. If the second molars are not included, slightly less reverse curve is normally appropriate.

Fig. 6.16 If necessary, bite-opening curves can be placed in upper and lower rectangular steel wires after the wires have been in place for 1 or 2 months. The lower wire needs to be flat (no torque) in the incisal region to prevent proclination of lower incisors. Both archwires are normally flat (no torque) in the molar regions, unless there is a need for molar torque changes. Approximately 3-4 mm of reverse curve is appropriate if the second molars are included. If the second molars are not included, slightly less reverse curve is normally appropriate.

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