Simplified Straight-Wire Technique: Class II Malocclusion Non-Extraction Treatments

Undoubtedly, by the middle of the 1970s, the development of the straight-wire appliance by Dr. Lawrence F. Andrews was one of the most significant advancements toward finishing orthodontic treatment since Dr. Edward H. Angle presented the edgewise bracket in 1925. Orthodontists could finally be free of the difficult task of bend construction. This new technique reduced stress, both for orthodontists and for the patients, and also increased and improved the quality of the treatment.

Nevertheless, the straight-wire mechanics were developed in order to reduce such bends, making it easier to achieve good treatment results. However, the first results were disappointing, as some undesirable side effects arose, such as the bite deepening and leading to a Toe Hold effect, mainly caused by the canine bracket slots.

Depending on the initial position of the canine’s crown, its straight-wire archwire slot can produce an increase in an overbite along with an open bite in the premolar area, once the initial lighter archwires are inserted in these slots. The very same vertical adverse deviation occurs during non-extraction treatments whenever there is an attempt at retraction in an arch.

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