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牙列拥挤、拔牙矫治，以往常用不锈丝弹簧，或用橡皮牵引圈拉尖牙向远中。但不锈钢弹簧力大不柔和，橡皮圈易老化。而镍钛簧是一种超弹性的新型正畸元件，经较长时间的临床应用后，性能良好，现报告如下。１、实验材料和方法选用北京有色金属研究总院研制的供口腔正畸专用镍钛丝拉簧。长为１０ｍｍ，两端各有一圆圈，匝数为２２圈，弹簧丝０．３ｍｍ，弹簧圈外径为１．４５ｍｍ，内径为０．８５ｍｍ，两端圆圈，一端挂在支抗牙带环的拉钩上，另一端结扎在需要牵拉的尖牙托槽上。力学试验：镍钛拉簧及不锈钢丝拉簧分别在拉伸机上进行拉伸试验（室温下）。试验结果可见在相同的变形率的情况下，不锈钢丝拉簧的拉力是镍钛拉簧的４．５倍，而恢复率则不到镍钛簧的一半，力学性能表明镍钛拉簧是用于牙齿正畸的良好材料。２、临床应用：我们对牙列拥挤，矫正需要减数患者，使用方丝弓矫治器，以镍钛丝拉簧拉尖牙往后。统计测量了拔牙后尖牙向远中移动的距离是上尖牙７．６±１．２ｍｍ；拉簧开始拉上尖牙的作用力量１．７４Ｎ（１７７．４克）；拉下尖牙向远中移动的距离是７．６±１．２ｍｍ，开始拉尖牙的作用力是１．６５Ｎ（１６８．３克）。３、临床效果：３３例应用方丝弓矫治器牵引尖牙往远中的病例，?
Crowded teeth, tooth extraction correction, the past commonly used stainless steel wire spring, or with rubber traction ring cantilevered teeth to the far. However, the stainless steel spring force is not gentle, rubber band is easy to aging. The nickel-titanium spring is a super-elastic new orthodontic components, after a longer period of clinical application, the performance is good, are as follows. 1, experimental materials and methods selected Beijing Nonferrous Metal Research Institute for the development of orthodontic nickel-titanium wire tension spring. Length of 10mm, both ends of a circle, the number of turns of 22, the spring wire 0.3mm, the coil diameter of 1.45mm, an inner diameter of 0.85mm, both ends of the circle, one end hung in the support ring Pull the hook, the other end ligation in the need to pull the canine bracket. Mechanical test: NiTi tension spring and stainless steel wire tension spring tensile test machine (room temperature). The test results show that under the same deformation rate, the tensile force of the stainless steel wire tension spring is 4.5 times that of the nickel-titanium tension spring, and the recovery rate is less than half of that of the nickel-titanium spring. The mechanical properties indicate that the nickel- Good material for orthodontics. 2, clinical application: we crowded dentition, orthodontics need to reduce the number of patients, the use of wire arch appliance, nickel-titanium wire pull spring cantilevered posterior. The distance between fangs moving fartherly after extraction was estimated to be 7.6 ± 1.2mm on the canines; 1.74N (177.4g) on the tension springs to pull on the fangs; The distance that moves in is 7.6 ± 1.2mm, the force that starts to pull canine is 1.65N (168.3 grams). 3, the clinical effect: 33 cases of square wire appliance traction fangs far cases,