HUBUNGAN ANTARA PERUBAHAN POSISI GIGI MOLAR PENJANGKAR KE ARAH MESIAL DENGAN PERUBAHAN DIMENSI VERTIKAL SEPERTIGA MUKA BAGIAN BAWAH (Kajian Sefalometri pada Maloklusi Kelas II Divisi 1 dengan Teknik Begg)

Molar migration mesially for closing extraction space will cause extrusion of the molar. Extrusion will influence rotation of the mandible and also vertical dimension. The purpose of this research was to know the relationship between changes of anchorage molar position mesially and one third of the lower facial vertical dimension in patients with class II division 1 malocclusion after treated with fixed orthodontic appliance by Begg technique. The study was an analytical research with a cross sectional approach. This research was evaluated at lateral cephalometric radiographs of 29 subjects before and after treatment, with criteria : class II division 1 malocclusion, class II skeletal, aged 18-30 years, and were treated using Begg technique fixed appliance with extraction of four first premolar. Cephalogram measurements consist of maxillary and mandibular molar position linearly and angularly, as well as one third of the lower facial vertical dimension linearly and angularly. The data were analyzed by using Pearson product moment correlation test and regression test. The result of this research showed that changes of maxillary molar position linearly and angularly, as well as mandibular molar position angularly were not correlated significantly with one third of lower facial vertical dimension (p>0,05). The significant and positive correlation was occurred between changes of mandibular molar position linearly and one third of lower facial vertical dimension (p