Kinzinger Gero S M, Diedrich Peter R
Department of Orthodontics, University of Aachen RWTH, Aachen, Germany.
Angle Orthod. 2008 Jul;78(4):676-81. doi: 10.2319/0003-3219(2008)078[0676:BOADJA]2.0.CO;2.
To analyze the forces and moments acting in the first molar region, induced by the Distal Jet appliance for maxillary molar distalization.
Over a working section of 3 mm with reactivation of the loaded spring systems, the force systems of three laboratory-fabricated appliances of identical design were analyzed with a 3D metering device.
The force systems registered in vitro exhibited complex biomechanics. Regular reactivation of the loaded coils resulted in consistent distalizing forces and uprighting moments, in forces and moments toward buccal as well as slightly intrusive forces, and mesial-inwardly rotating moments. In the sagittal dimension, the Distal Jet appliance allows almost translatory molar distalization. Accordingly, applying uprighting activation is not necessary for treatment. Because of the application of the force palatal to the center of resistance of the molars, the teeth experience undesired mesial-palatal and distal-facial rotation.
The Distal Jet appliance allows almost translatory distal molar movement, and uprighting activation is not necessary for treatment. The force applied palatal to the center of resistance of the molars produces an undesired mesial-palatal and distal-facial rotation. Regular intraoral coil spring reactivation is needed.
分析远中喷射矫治器对上颌磨牙远移时在第一磨牙区域产生的力和力矩。
在加载弹簧系统重新激活的3毫米工作段上，使用三维测量装置分析三种设计相同的实验室制作矫治器的力系统。
体外记录的力系统呈现出复杂的生物力学特性。对加载的弹簧圈进行定期重新激活会产生持续的远移力和直立力矩、向颊侧的力和力矩以及轻微的侵入力，还有近中向内旋转力矩。在矢状面上，远中喷射矫治器几乎能使磨牙进行平移远移。因此，治疗时无需进行直立激活。由于力施加于腭侧磨牙阻力中心，牙齿会出现不期望的近中腭向和远中面旋转。
远中喷射矫治器几乎能使磨牙进行平移远移，治疗时无需进行直立激活。施加于腭侧磨牙阻力中心的力会产生不期望的近中腭向和远中面旋转。需要定期进行口内弹簧圈重新激活。
