| Summary: | 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<0,05 and r=0,545). Regression equation was Y = 1,188 + 0,342X.
Conclusions of this research were : (1). Changes of the maxillary
anchorage molar mesially, maxillary and mandibular molar inclination angles
were not correlated with one third of lower facial vertical dimension
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