Stability of obwegeser II method in mandibular prognathic or anterior open bite patients

Jung, Chang Wook; Nam, Jeong Hun; Lee, Sang Han; Kwon, Tae Geon

Abstract

The purpose of this study was to evaluate the postoperative stability of the severe open bite or mandibular prognathic patients after mandibular set back surgery by Obwegeser II method. There were 19 patients who had been undergone Obwegeser II method. The horizontal and vertical position of the cephalometric points were measured preoperation and immediate postoperation, postoperative 1 month, postoperative 6 months ; were analyzed by linear measurement to evaluate changes in skeletal landmark and the relapse was compared between open bite group and prognathism group. By the operation, horizontal change of B was 6.84+/-4.35mm and vertical change of B was 6.28+/-3.25mm in open bite group and horizontal change of B was 14.20+/-4.81mm and vertical change of B was 1.99+/-2.66mm in prognathism group, horizontal change of Pog was 3.82+/-5.71mm and vertical change of Pog was 5.38+/-2.11mm in open bite group and horizontal change of Pog was 13.24+/- 5.99mm and vertical change of Pog was 1.91+/-0.94mm in prognathism group. Between immediate postoperation and postoperative 1 month, all skeletal landmarks change was no statistical difference (p>0.05) and there were no statistical difference between open bite group and prognathism group except x-Me landmark (p>0.05). Between postoperative 1 month and 6 months, horizontal change of B was 0.12+/-1.35mm and vertical change of B was 1.47+/-1.48mm in open bite group and horizontal change of B was 1.43+/-1.35mm and vertical change of B was 0.82+/-1.99mm in prognathism group, horizontal change of Pog was 0.13+/-1.40mm and vertical change of Pog was 0.88+/-1.71mm in open bite group and horizontal change of Pog was 1.08+/-1.74mm and vertical change of Pog was 0.47+/-1.57mm in prognathism group (p>0.05) and there were no statistical difference between open bite group and prognathism group (p>0.05). Between immediate postoperation and postoperative 6months, horizontal change of B was 0.24+/-1.17mm and vertical change of B was 1.87+/-1.63mm in open bite group and horizontal change of B was 1.54+/-1.55mm and vertical change of B was 1.04+/-1.96mm in prognathism group, horizontal change of Pog was 0.91+/-1.46mm and vertical change of Pog was 1.18+/-2.05mm in open bite group and horizontal change of Pog was 0.96+/-1.62mm and vertical change of Pog was 1.23+/-2.35mm in prognathism group (p>0.05) and there were statistical difference between open bite group and prognathism group in x-B, x-Pog, x-Gn, x-Me (p<0.05). Obwegeser II method is considered as one of the best operation when surgical correction of severe open bite or severe mandibular prognathism is needed.