This study was attempted to investigate the skeletal and soft tissue morphological characteristics of bimaxillary protrusion in Korean young adults.
Lateral cephalometric radiographs of 70 Korean adults with bimaxillary protrusion were taken. The samples were classified into 2 groups: 1) Bimaxillary prognathism - It was a skeletal problem in which both maxilla and mandible had a relationship
more
forward than normal with respect to the cranial base. 2) Bialveolar Protrusion - It was a condition in which procumbency of both dentitions without forward position of basal bone.
@ES The results of this study were as follows:
@EN There were significant differences between male and female in E-line to LL, Nasolabial and of bimaxillary prognathism group and SN to PP, ANB, NAPog, U1 to NA。, U1 to NA(mm), E-line to UL, E-line to LL, H angle of bialveolar protrusion
group.
2. In relationship of maxilla and mandible to cranial base, SN to Palatal plane in the bialveolar protrusion were larger than that in the bimaxillary prognathism group. SN to Mandibular plane in the bialveolar protrusion of female group was
larger
than
that in the other group.
3. In basal bone relationship, ANB, NAPog in the bimaxillary prognathism of female group were larger than those in the bialveolar protrusion.
4. In upper and lower incisor position, incisor position in the bialveolar protrusion group was inclined more labially than that in the other group.
5. Upper lip position to esthetic line was anteriorly positioned in bimaxillary prognathism of female. Nasolabial angel in the bialveolar protrusion of female was larger than that in the other group.
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