固定矫治用磁体产生的三维矫治力分析

Evaluation of three dimensional orthodontic force produced by magnet of fix appliance

目的:分析固定矫治用磁体自身产生的三维矫治力的特征及大小。方法:使用万能材料实验机,分别测试2块固定矫治用磁体间的吸引力、排斥力、倾斜矫治力、旋转矫治力及磁体与钛镍丝组合后的倾斜矫治力、旋转矫治力。结果:2块磁体0～5mm间距的吸引力为4.68～0.45N,排斥力为3.00～0.40N。当2块磁体间距为0、1、2mm,倾斜10°～40°时,其倾斜矫治力分别为1.54～1.67N、0.63～0.69N、0.47～0.54N。当2块磁体间距为0、1、2mm,水平向内外旋转10°～40°时,其矫治力分别为0.97～1.32N、0.53～0.59N、0.39～0.48N。0.014英寸镍钛丝与4mm间距磁体组合后,倾斜10°～40°的矫治力达0.32～0.5N。0.012英寸镍钛丝与3mm间距磁体组合后,旋转10°～40°的矫治力达0.32～0.39N。结论:磁体制作成托槽自身能产生矫治力,在一定程度上可替代机械矫治力。

PURPOSE： To analyze the feature and magnitude of three dimensional orthodontic force produced by the magnet of fix appliance. METHODS： Forces detected by universal fatigue test system included the attractive and repulsive,the inclined and rotated orthodontic forces of two magnets in different air gaps, and the integrated inclined and rotated orthodontic forces of two magnets and NiTi wire. RESULTS： The attractive and repulsive forces of two magnets were 4.68 to 0.45 N and 3.00 to 0.40 N respectively in the air gaps of 0 to 5 mm. The inclined orthodontic forces were 1.54 to 1.67 N, 0.63 to 0.69 N, 0.47 to 0.54 N when the magnets were vertically inclined 10°to 40° in the air gaps of 0, 1, 2mm. The rotated orthodontic forces were 0.97 to 1.32 N, 0.53 to 0.59 N, 0.39 to 0.48 N when the magnets were horizontally rotated 10° to 40° in the air gaps of 0, 1, 2mm. The integrated orthodontic force of two magnets and 0.014- inch NiTi wire was 0.32 to 0.5 N when the magnets was vertically inclined 10° to 40° in the air gap of 4 mm. The integrated orthodontic force of two magnets and 0.012-inch NiTi wire was 0.32 to 0.39 N when the magnets were horizontally rotated 10° to 40° in the air gap of 3 mm. CONCLUSION： Magnets made into orthodontic brackets to some extent could replace the mechanical orthodontic force produced by orthodontic wires and elastics.