Yoshida N, Jost-Brinkmann P G, Yamada Y
Department of Orthodontics, School of Dentistry, Nagasaki University, Japan.
Angle Orthod. 1995;65(3):199-208. doi: 10.1043/0003-3219(1995)065<0199:ITMUEF>2.0.CO;2.
Initial movement of the maxillary first molars under the application of straight-pull, cervical-pull, and high-pull headgear was measured in human subjects. Facebow deflection can influence molar movement as the relationship of the force vector to the molar's center of resistance changes with an increase of force. The present study proposes using headgear with a combination of variable-pull headcap and short outer bow. A variable-pull headcap allows a great range in force direction. The direction of the headgear force system can be accurately determined using a short outer bow.
在人体受试者中测量了上颌第一磨牙在直拉、颈拉和高位头帽作用下的初始移动。随着力的增加，力向量与磨牙阻力中心的关系发生变化，面弓偏转会影响磨牙移动。本研究建议使用可变拉力头帽和短外弓相结合的头帽。可变拉力头帽可使力的方向有很大范围的变化。使用短外弓可以准确确定头帽力系统的方向。
