분절호선법으로 상하악 절치부 압하시 순측경사도가 미치는 영향에 관한 3차원 유한요서법적 연구
The effect of labial Inclination on intrusion of the upper and lower Incisors by three-dimensional finite element analysis
김동우, 박정혜, 손홍주, 양훈철, 김기태,
소속 상세정보
김동우 ( ) - 부산대학교 치과대학 교정학교실
박정혜 ( ) - 부산대학교 치과대학 교정학교실
손홍주 ( ) - 부산대학교 치과대학 교정학교실
양훈철 ( ) - 포항공과대학교 기계공학과
김기태 ( ) - 항공과대학교
KMID : 0361920030330040258
Abstract
This study was designed to investigate the position of anteroposterior center of resistance for genuine intrusion and the mode of change of the minimum distal force for simultanous intrusion and retraction of the upper and lower incisors according to the increase of labial inclination. For this purpose, we used the three-piece intrusion arch appliance and three-dimensional finite element models of upper and lower incisors.
1. Positions of the center of resistance in upper incisors according to the increase of the labial inclination were as follows; 1) In normal inclination situation, the center of resistance was located in 6mm behind the distal surface of the lateral incisor bracket.
2) In 10° increase of the labial inclination situation, the center of resistance was located in 9mm behind the distal surface of the lateral incisor bracket.
3) In 20° increase of the labial inclination situation, the center of resistance was located in 12m behind the distal surface of the lateral incisor bracket.
4) In 30° increase of the labial inclination situation, the center of resistance was located in 16m behind the distal surface of the lateral incisor bracket.
2. Positions of the center of resistance in lower incisors according to the increase of the labial inclination were as follows; 1) In normal inclination situation, the center of resistance was located in 10mm behind the distal surface of the lateral incisor bracket.
2) In 10° increase of the labial inclination situation, the center of resistance was located in 13mm behind the distal surface of the lateral incisor bracket.
3) In 20° increase of the labial inclination situation, the center of resistance was located in 15m behind the distal surface of the lateral incisor bracket.
4) In 30 increase of the labial inclination situation, the center of resistance was located in 18m behind´ the distal surface of the lateral incisor bracket
3. The patterns of stress distribution were as follows;
1) There were even compressive stresses in and periodontal ligament when intrusion force was applied through determined center of resistance.
2) There were gradual increase of complexity in compressive stress distribution pattern with increase of the labial inclination when intrusion and retraction force were applied simultaneously.
4. With increase of the labial inclination of the upper and lower incisors, the position of the center of resistance moved posteriorly. And the distal force for pure intrusion was increased until 20° increase of the labial inclination.
키워드
과개교합;절치부 압하;저항중심;3차원 유한요소법;Deep overbite;Incisor intrusion;Center of resistance;Three-dimensional finlte element analysis
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