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Pendulum K引起的作用力和力矩,以在横断面和矢状面上进行磨牙远侧。专门设计的测试装置(带有锚固单元和两个电热磨牙的人工上颌骨,一个电子测量单元,一个带有力矩传感器的单元,一个模拟/数字转换器和一个数据读出单元)允许模拟一方面是体内条件,另一方面是精确确定力系统。所研究的器具是Pendulum K的三个标本。对最终产生的力系统进行的体外测量显示,当连续激活远端螺钉(10次激活)时,横向和矢状面的力和力矩在3 mm的测量增量内几乎保持恒定。 /毫米)。然而,在没有重新激活所结合的远端螺钉的情况下,记录了力系统的显着下降。摆K允许上颌臼齿的平移远侧移动,从而使牙弓扩张,并在需要相应指示的情况下无需拔出恒牙。这是通过不断调整内置的远端螺钉并通过对摆弹簧进行特定的预激活来实现的。

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