Wichelhaus A, Sander F G
Abteilung Kieferorthopädie, Universität Ulm.
Fortschr Kieferorthop. 1995 Jul;56(4):224-35. doi: 10.1007/BF02168135.
New torque-segmented arch wires are presented which consist of a superelastic anterior component with 30 degrees or 45 degrees torque and which are connected to 2 steel lateral components by means of a crimped connector. When using such torque-segmented arch wires, the crimped connector rests mesially to the canine bracket and the lateral components exhibit a torque of 0 degree. The use of the torque-segmented arch wires requires the practitioner to adjust the anterior tooth segment, to bend in first order bends in the steel lateral portion as well as to bend in a sweep to avoid an anterior tooth extrusion, and, if desired, to bend in third order bends to influence premolars and molars. In some cases the simultaneous application of palatal arches can become necessary, because each torque transfer results in a transversal enlargement in the molar area. Compared to conventional steel wires with dimensions of 0.016 x 0.022 in which an anterior tooth torque is bent, the torque segmented arch wires exhibit considerably fewer side effects, but there is a larger distally rotating moment for the molars. 1. When applying torque-segmented arch wires, the extrusive force transferred to the anterior teeth is considerably smaller. 2. The protrusive force acting on the anterior teeth is also considerably smaller, which results in a reduced demand being placed on the anchorage of the molars. 3. The torque transfer to the incisors rests in a quite moderate range, even in the case of a 50 degrees torque. For this reason, the practitioner can expect diminished or no resorptions at all compared to the aforementioned steel wires. 4. The Martensite plateau of the torque-segmented arch wires exhibit constant moments in large areas so that such arch wires can be used in almost every anterior tooth position. 5. The segmented wires presented here can be applied not only in the case of the standard edgewise technique but also in each case of the straight-wire technique. 6. These new arch wires require no readjustment of torque values. 7. To control the transferred torque values it is recommended that the already transferred torque values be monitored during each check-up with the help of the described torque key. 8. When the torque values of the brackets are known, the torque key renders frequent patient X-rays superfluous. 9. When the desired torque values are attained, treatment can proceed using conventional arch wires.
新型扭矩分段弓丝已推出，其由具有30度或45度扭矩的超弹性前部组件组成，并通过压接连接器与两个钢制侧部组件相连。使用这种扭矩分段弓丝时，压接连接器位于尖牙托槽的近中位置，侧部组件的扭矩为0度。使用扭矩分段弓丝要求从业者调整前牙段，在钢制侧部进行一阶弯曲，以及进行扫弯以避免前牙伸长，并且如果需要，进行三阶弯曲以影响前磨牙和磨牙。在某些情况下，可能需要同时应用腭弓，因为每次扭矩传递都会导致磨牙区域横向扩大。与弯曲前牙扭矩的0.016×0.022尺寸的传统钢丝相比，扭矩分段弓丝的副作用明显更少，但磨牙的远中旋转力矩更大。1. 应用扭矩分段弓丝时，传递到前牙的挤出力明显更小。2. 作用在前牙上的前突力也明显更小，这导致对磨牙支抗的需求降低。3. 即使在50度扭矩的情况下，传递到切牙的扭矩也处于相当适中的范围内。因此，与上述钢丝相比，从业者可以预期吸收减少或根本没有吸收。4. 扭矩分段弓丝的马氏体平台在大面积内呈现恒定力矩，因此这种弓丝几乎可用于每个前牙位置。5. 这里介绍的分段弓丝不仅可用于标准方丝弓技术，也可用于直丝弓技术的每种情况。6. 这些新型弓丝无需重新调整扭矩值。7. 为了控制传递的扭矩值，建议在每次检查时借助所述扭矩钥匙监测已传递的扭矩值。8. 当托槽的扭矩值已知时，扭矩钥匙使患者频繁进行X线检查变得多余。9. 当达到所需扭矩值时，可使用传统弓丝继续治疗。
