“ A piggy back intrusion arch was used to intrude the maxillary incisors to a proper overbite.” Fig. 36 Fig. 37 and slightly prognathic mandible) (Figs. 37-38). The maxillary arch is being widened and protracted with a Modified Tandem Appliance (MTA) (Fig. 39 & 40-C). The MTA consists of three components: a maxillary arch widening compo-nent with lateral arms and hooks (Fig. 39-A,C), a mandibular anchor compo-nent (similar to a lingual arch) (Fig. 39-B) and a removable bow with extensions that insert into the lip bumper tubes of the mandibular first molar Fig. 38 bands (Fig. 39-A,B,D). At night (10+ hours per day) two or four 8 ounce elastics are worn from the maxillary component lateral arm www.orthodontics.com Fall 2015 27
Journal of the American Orthodontic Society Fall 2015: Page 27
