Читать книгу Orthodontic Treatment of Impacted Teeth - Adrian Becker - Страница 62

A bypass archwire can be used to connect all teeth on the arch with the exception of the ectopic tooth, to form a rigid stabilizing anchorage unit. It requires a heavy archwire that, for maximum anchorage value, needs to be of rectangular stainless steel wire, which ideally will fill the slots of the brackets. Bypasses are stepped out, with either first‐ or second‐order bends, in order to avoid any interference with the erupting ectopic tooth.

Using a bypassing arch wire, it is possible to distribute the undesired forces and moments over a larger number of teeth and therefore minimize clinical side effects.

Fig. 3.13 When inverting a left upper canine bracket, it has to be kept in the same side of the arch in order to retain the same distal root tip.

Because of the low forces engaged in orthodontic treatment in general, the reinforcement of anchorage by using mini‐screws is not usually necessary. Nevertheless, the introduction of skeletal anchorage has potentially widened the spectrum of orthodontics, allowing for treatments that could not previously be done solely with conventional appliances. Biomechanical knowledge is, however, mandatory, in order to ensure that the system is not abused [3].