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目的测试不同高度的颊侧多曲簧在开闭口运动过程中产生的矫治力。方法选取直径为0.8mm的医用不锈钢丝由同一人进行弯制,所弯制的颊侧多曲簧高度分别为16mm,17mm,18mm,19mm,每种样本各10个。将颊侧多曲簧样件固定在三维测力仪上,模拟口内开闭口运动中应力的变化。结果多曲簧高度为16mm时,最大压应力值为(492.5±54.81)g,最大拉应力值为(346.5±57.34)g;多曲簧高度为17mm时,最大压应力值为(436.9±39.23)g,最大拉应力值为(356.4±58.98)g;多曲簧高度为18mm时,最大压应力值为(379.7±31.94)g,最大拉应力值为(270.2±50.34)g;多曲簧高度为19mm时,最大压应力值为(432.0±29.69)g,最大拉应力值为(326.1±32.92)g。结论高度为18mm的颊侧多曲簧产生的压应力符合颌骨矫形力的最适力值范围,同时产生的拉应力最小,最适用于矫治AngleⅢ类错牙合畸形。
Objective To test the orthodontic force produced by buccal multi-leaf spring with different heights during the movement of opening and closing mouth. Methods The medical stainless steel wire with the diameter of 0.8mm was made by the same person. The bending height of the buccal multilobe was 16mm, 17mm, 18mm and 19mm respectively, 10 for each sample. The buccal multi-turn spring specimen was fixed on a three-dimensional dynamometer to simulate the change of stress in the mouth opening and closing movement. Results The maximum compressive stress was (492.5 ± 54.81) g and the maximum tensile stress was (346.5 ± 57.34) g when the height of multi-convolution spring was 16mm. The maximum compressive stress was 436.9 ± 39.23 ) g, and the maximum tensile stress is (356.4 ± 58.98) g. The maximum compressive stress is (379.7 ± 31.94) g and the maximum tensile stress is (270.2 ± 50.34) g when the height of multi- The maximum compressive stress is (432.0 ± 29.69) g and the maximum tensile stress is (326.1 ± 32.92) g when the height is 19mm. Conclusions The compressive stress generated by buccal multi-klystron with a height of 18mm conforms to the most suitable range of orthopedic force of mandible and produces the least tensile stress. It is most suitable for the treatment of Angle Ⅲ malocclusion.