Constructing finite element model of mandible,teeth,periodontal tissue and rocking chair round archwire with curve of 10°,depth of 2 mm,diameter of 0. 014,0. 016,0. 018,0. 020 in. Force on roots of incisors was bigger than on others. All force was increased generally with the increasing diameter of arch wires. Incisors was intruded, canine,premolar and the first molar were extruded. When using rocking chair with curve of 10°,depth of 2 mm, the diameter should not be more than 0. 018 in.%建立包括下颌颌骨、牙列、牙周组织和曲度10°、弧形深度2 mm、直径分别为0. 014、0. 016、0. 018和0. 020 in的圆丝摇椅弓有限元模型. 当弓丝直径一定时,切牙应力值最大,尖牙次之,第一前磨牙最小. 随着弓丝直径变大,牙根牙周应力增加. 切牙有压低和牙冠唇倾移动,尖牙、前磨牙和第一磨牙有伸长和冠远中竖直趋势. 临床中使用不锈钢圆丝摇椅弓在曲度10°,弧形深度2 mm时,弓丝直径不宜超过0. 018 in.
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