Convex profile을 보이는 증례에서 하악골 골개조의 형태적 특징

Abstract

This study was performed to evaluate the bone remodeling characteristics for the cases that showed convex profile and posterior rotation of mandible. Sample for study was consisted of 14 male and female cases that the Frankfort-mandibular angle was larger than 1 standard deviation (male: 5.28°, female: 4.62°) from the average (male: 22.74°, female: 24.26°) and the normal control group was consisted of 20 male and female cases that showed the normal range of Frankfort-mandibular angle. Cephalo- metric radiographs were taken and the pixel coordinates of 30 anatomic and derived landmarks of mandible were pointed out with the compensation of the length and inclination with the corpus axis. Mandibular morphology was reconstructed by the mean coordinates of landmarks and compared. The following results were obtained from the comparison;

1.The length of mandibular ramus was shown as shorter in the convex profile group than in the normal control group. 2.The mandibular gonial angle was shown as larger in the convex profile group than in the normal control group. 3.The inclination of mandibular ramus and lower border was shown as larger in the convex profile group than in the normal control group. 4.The antegonial notch was shown as deeper in the convex profile group than in the normal control group. 5.The length of symphysis was shown as longer in the convex profile group than in the normal control group. 6.The inclination of occlusal plane was shown as more posterior iclination in the convex profile group than in the normal control group.

From above results, the position of mandible results from the growth pattern of mandible could be considered to affect the mandibular morphology.