Laterognathism의 술후 전방하악골상행지경사도 변화에 관한 정모두부방사선학적 연구
The change of frontal ramal inclination (FRI) after orthognathic surgery with laterognathism: posteroanterior cephalometric study
유상진,
소속 상세정보
유상진 ( Yu Sang-Jin ) - 포스치과 구강악안면외과
KMID : 0355620110370010021
Abstract
Introduction: To compare the change in frontal ramal inclination (FRI) in laterognathism after orthognathic surgery.
Materials and Methods : Twenty four patients (10 men, 14 women; mean age, 22.8±5.2 years) with minimal facial canting (≤2 mm) and apparent menton deviation (5.9±2.4 mm) who had been operated on to correct facial asymmetry and skeletal CIII malocclusion, were selected. On a preoperative posteroanterior (PA) cephalogram, the FRI of the deviated side and non deviated side, L1 deviation amounts and menton deviation amounts were measured. The FRI differences between both sides were compared, and the correlations between the measured deviated elements and the FRI differences were analyzed. On a postoperative PA cephalogram, the shifting amount of L1, shifting amount of L7 and FRI of both sides were measured, and the correlations between the shifting elements and the change in FRI were analyzed.
Results: On the preoperative PA cephalogram, the FRI of the non deviated side was significantly greater than those of the deviated side. The differences in FRI, with a menton deviation amount showed a significant correlation. On the postoperative PA cephalogram, the FRI differences between the deviated and non deviated side were decreased significantly and mandibular transverse movement toward central position was noted. The mean shifting amounts of L7 were associated with the amount of change in the deviated side of FRI.
Conclusion: Transverse shifting of the mandible through orthognathic surgery decreases the FRI difference, which showed laterognathism, and improves the facial contour.
키워드
Frontal ramal inclination(FRI); Laterognathism; Mandibular transverse movement; Orthognathic surgery; Cephalogram
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