Analysis on curative effect of functional orthodontic treatment in patients with Class II division 1 malocclusion / 吉林大学学报(医学版)

ABSTRACT

Objective: To detect the clinical effect of T win-Block appliance in the treatment of the patients with Class II division 1 malocclusion, and to provide the basis for clinical treatment. Methods: A total of 30 patients with class II division 1 malocclusion were treated with Twin-Block appliance. The variables of the patients before and after treatment were measured with Ricketts cephalometric radiographys. Results: Compared with before treatment, the length of corpora mandibulae (Xi-Pm) of the patients after treatment was increased by 2. 50 mm (P<0. 05), the SNB angle was increased by 2. 58° (P<0. 05), and the ANB was decreased by 2. 71 (P<0. 01); the molar relationship distance and the Overjet were decreased by 2. 81 mm and 3. 68 mm, respectively (P<0. 01); the Ll-OP was decreased by 1.89 mm, the distance of Ll-APog was increased by 1.84 mm, and the angle Ul-APog was decreased by 7. 35° (P<0. 01); the Ls-TVL was increased by 1. 85 mm, the Sm-TVL was increased by 2. 12 mm (P<0. 05), and the Pos-TVL was increased by 2. 89 mm (P<0. 05). Conclusion: The Twin-Block appliance could obviously promote the development of mandibular bone, upright the anterior teeth and improve the lip angle of upper anterior teeth and the proflie in the treatment of the patients with class II division 1 malocclusion in the growth development period.