골격성 Ⅲ급 부정교합을 동반한 악교정수술 환자에서 수술 전후의 하악기능 변화에 관한 실험적 연구
THE CHANCES OF MANDIBULAR MOVENENT AND MUSCLE ACTIVITY FOLLOWING ORTHOGNATHIC SURGERY IN RPTIENTS WITH MANDIBULAR PROGNATHISM
이형식, 박영철,
소속 상세정보
이형식 ( Lee Hyung-Sik ) - 연세대학교 치과대학 교정학교실
박영철 ( Park Young-Chel ) - 연세대학교 치과대학 교정학교실
KMID : 0361919920220010067
Abstract
The purpose of this study was to investigate the changes of mandibular movement and muscle activity following orthognathic surgery in patients with mandibular prognathism. Lateral cephalogram, M.K.G., E.M.G. recordings were obtained immediately before surgery, and 2 months and 8 months after surgery. Among the patients who received orthognathic surgery, 19(13 men, 6 women) were selected for this study. Statistical analysis for each time interval differences were performed with the SPSS package. The results were as follows:1.Compared with the pre-operative group(opening 349.7 mm/sec, closing 313.1mm/sec), the mean values of the maximum opening and closing velocity in the skeletal Class Ⅲ surgery group were significantly decreased in the 2 months post-operative (opening 232.9 mm/sec, closing 206.9 mm/sec), but the values tended to increase in the 8 months post-operative group(opening 280.9mm/sec, closing 319.1mm/sec). 2.Compared with the pre-operative group(61.7mm/sec),the maximum velocity of the terminal tooth contact increased in the 2 months (72 mm/sec) and 8 months( 105.7mm/sec) post-operative groups. 3.In the mean value of vertical freeway space, there was significant difference between the normal group and the pre-operative group, but not between the normal group and the 8 months post-operative group. 4.In the mean values of the maximum opening, the maximum anterio-posterior movement from centric-occlusion, and the lateral deviation from centric occlusion, there was no significant difference between the normal group and the surgery group(the pre-operative and the 8 months post-operative groups). 5.The mature swallowing pattern was 58% in the pre-operative group, but 90% in the 2 months post-operative group, and 63% in the 8 months post-operative group. 6.In the comparison of muscle activity, there was no significant difference between the normal group and the surgery group during the rest position. However, during cotton roll clenching, there was significant difference between the normal group and the pre-operative group, but not between the normal group and the 8 months post-operative group.
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