The aim of this study was to analyse the acting forces and moments induced by a special orthodontic appliance, the Pendulum K, for molar distalization in the transverse and sagittal planes. The purpose-designed test set-up (artificial maxilla with anchorage unit and two electrothermodynamic molars, an electronic measuring unit, a unit with force-moment sensor, an analogue/digital converter, and a data read-out unit) allowed simulation of in vivo conditions on the one hand and precise determination of the force systems on the other. The appliances investigated were three specimens of the Pendulum K. In vitro measurement of the resulting force systems revealed that the forces and moments in the transverse and sagittal planes remained almost constant over a 3 mm measuring increment when the distal screw was continuously activated (10 activations/mm). Without reactivation of the incorporated distal screw, however, a marked decline in the force systems was recorded. The Pendulum K allows translatory distalization of the upper molars and thus dental arch expansion, dispensing with the need for permanent teeth to be extracted, subject to a corresponding indication. This is achieved by continuous adjustment of an incorporated distal screw and by specific pre-activations of the Pendulum springs.

译文

这项研究的目的是分析由特殊的正畸矫治器摆K引起的作用力和力矩,以在横向和矢状平面中使磨牙远侧。目的设计的测试装置 (带有锚固单元和两个电热磨牙的人造上颌骨,一个电子测量单元,一个带力-力矩传感器的单元,一个模拟/数字转换器,和数据读出单元) 一方面可以模拟体内条件,另一方面可以精确确定力系统。所研究的器具是摆锤K的三个样本。所得力系统的体外测量表明,当远端螺钉连续激活 (10个激活/mm) 时,在3毫米测量增量内,横向和矢状平面中的力和力矩几乎保持恒定。但是,如果不重新激活合并的远端螺钉,则记录到力系统明显下降。摆锤K允许上磨牙的平移远端化,从而使牙弓扩张,从而无需拔出恒牙,但要有相应的指示。这是通过连续调节结合的远端螺钉和通过摆簧的特定预激活来实现的。

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