摘要
目的:建立并使用上颌发育不足三维有限元模型,研究不同前方牵引力值对颅上颌复合体的影响,以期为上颌前方牵引的临床应用提供理论依据。方法:选择1例9岁上颌发育不足的女性志愿者,采用螺旋CT扫描、数据传输与转录、Mimics10.0软件建立颅上颌复合体的三维有限元模型,利用ANSYS10.0软件,在上尖牙近中牙槽骨处加载与水平面呈向下30°的3～8N前方牵引力,分析颅上颌复合体的位移变化和内部应力分布。结果:不同力值下,N、A、ANS点在Y、Z向位移趋势一致,上颌骨向前上方移动;上牙弓后牙区近中向位移;随牵引力的增大,位移量及颅上颌复合体范式应力和最大主应力也增大。当牵引力大于5N/侧时,各向位移及应力更显著。结论:上颌骨的前方牵引可产生颅上颌复合体的前上方向位移以及上牙弓缩窄。慎用>5N的牵引力。
PURPOSE： To offer scientific basis for clinical use of maxillary protraction by establishing and using a three-dimensional finite element model（3-D FEM） of maxillary deficiency and study the influence of protraction force on cranio-maxillary complex.METHODS： A 3-D FEM of cranio-maxillary complex of maxillary deficiency was established from a 9-year old female by using thin-slice high resolution CT scanning and digital image transfer and transcription.And 6 forces from 3N to 8N downward the level with an angle of 30° were loaded at the area of maxillary canine.The displacement and stress distribution of the cranio-maxillary complex were analysed by using ANSYS 10.0 software package.RESULTS： Under these forces,the displacement of N,A,ANS points had a same trend in Y,Z directions.The maxilla moved forward and upward,and the posterior of maxillary dental arch had a trend of medial movement.With the force increasing,all of the displacement and stress increased.When the force was greater than 5N per side,the change was more significant.CONCLUSIONS： The cranio-maxillary complex shows forward and upward displacement and coarctation of upper arch with the force of maxillary protraction.The force greater than 5N should be used carefully.
出处
《上海口腔医学》
CAS
CSCD
2011年第1期88-92,共5页
Shanghai Journal of Stomatology
