Fig. 21 Fig. 20 First update (Fig. 17) • All of the mandibular teeth are unraveling • The distance between the MB cusp tips of 6 I 6 is 51 mm. Second update (Fig. 18-B) • The mandibular teeth continue to unravel. • The distance between the MB cusp tips of 6 I 6 is 50 mm. • The crowns of all of the teeth are upright over their respective roots. • The second molars are not impacted. • The mesial surfaces of 6 I 6 almost parallel one another. Treatment is ongoing. Fig. 22 Case #2: Conditions (Fig. 19) • Narrow arches • Mesially rotated maxillary and mandibular first molars • 1 in crossbite 1 • Gingival stripping on the labial of 1 • The incisal edge of 2 is distal to the mesial surface of D • 1 to mandibular plane angle is 87° (90-100° is normal) • The distance between the MB cusp tips of 6 I 6 is 40 mm. At each visit, the NPE was expanded as described above and the lip bumper was widened posteriorly 2 mm advanced anteriorly 2 mm and maintained in the Level 1 position. First update (Fig. 20), Results at the end of Phase 1 treatment (Figs. 21 and 22)-• Broad arch forms Fig. 23 • Mesial surfaces of 6 I 6 and 6 I 6 parallel each other • 1 no longer in crossbite 1 • Gingival stripping on the labial of 1 has resolved • The incisal edge of 2 is positioned correctly rela-tive to the mesial surface of D • The distance between the MB cusp tips of 6 I 6 is 47 mm. www.orthodontics.com Summer 2016 21
Journal of the American Orthodontic Society Summer 2016 / Buyer's Guide: Page 21
