Abstract
The Johnson twin arch appliance is an effective mechanism for treating the various types of malocclusion. If used to treat the so-called extraction case, however, the appliance has certain deficiencies. These deficiencies are overcome, for the most part, when (1) a more efficient method of moving canines distally is employed, (2) the intraoral anchorage is angmented by extraoral anchorage, and (3) the operator has more effective control over the positions of the mandibular incisors and the maxillary and mandibular premolars. In the modified Johnson twin arch technique that has been described, several methods of overcoming these deficiencies have been outlined.
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