圆丝摇椅弯曲度与托槽摩擦力大小的实验研究

Study of friction between the round wire and bracket in different angle of gable bend

目的研究不同直径圆丝的摇椅曲度与直丝托槽之间摩擦力大小关系,为临床医师选择不同直径圆丝的摇椅曲度提供参考。方法选用标准石膏模型翻制成树脂模型,粘贴杭州新亚齿科材料生产的HX标准型网底直丝弓托槽,不锈钢结扎丝常规结扎,测量两种圆形弓丝(0.016英寸、0.018英寸,澳大利亚圆丝)在上颌尖牙和第二双尖牙之间加载不同的摇椅度数(0°、10°、20°、30°)时弓丝与托槽之间的摩擦阻力。整个实验均在干燥条件下进行。对测量结果分别进行单因素方差分析。结果 0.016英寸澳大利亚不锈钢圆丝于尖牙与第二双尖牙之间分别加载0°、10°、20°、30°的摇椅弯曲,平均滑动摩擦力除20°与30°组内比较无统计学意义外,其余各组内比较均有统计学意义(P<0.05)。0.018英寸澳大利亚不锈钢圆丝于尖牙与第二双尖牙之间加载0°、10°、20°、30°的摇椅弯曲,平均滑动摩擦力除10°与20°组内比较无统计学意义外,其余组内比较均,有统计学意义(P<0.05)。0.016和0.018英寸澳大利亚不锈钢圆丝在不同摇椅弯曲度的摩擦力曲线显示弓丝与托槽的滑动摩擦力跟弓丝尺寸呈正相关。结论弓丝与托槽的滑动摩擦力随着弓丝直径增大而增加,随着弓丝摇椅弯曲度数增加而增大。

Objective To identify the friction between different size round archwire and HX straight-wire metal bracket in different angle of gable bend. Methods A plastic model was duplicated from standard plaster model. The do- mestic HX straight-wire metal brackets were stieked up plastic mode. The archwire was fixed with ligature wire. Then the friction were measured between bracket and two size of archwire （0. 016 inch/0. 018 inch Australian wire） in different angle of gable bend with （0°/10°/20°/30°）. The test had been done on dry condition. Results 0. 016 inch and 0. 018 inch archwire with different angle of gable bend showed 0. 016 inch archwire with angle of gable bend were at 0°, 10°, 20° and 30°, separately. There were significant difference, between 0° and 10°, 0° and 20°, 0° and 30° and between 10° and 20°, 10° and 30°（P〈O. 05）. But 0. 016 inch archwire with angle of gable bend were at 20° and 30°. 0. 018 inch archwire with angle of gable bend were at 0°, 10°, 20°, 30°, separately. There were significant difference between 0° and 10°,0°and 20°, 0° and 30°and between 10°and 30°, 20°and 30°（P〈0.05 =. But 0. 018 inch archwire with angle of gable bend were at 10°and 20°. There was no significant difference （P〉0.05）. 0. 016 and 0. 018 inch archwire with angle of gable bend were at 0°, 10°, 20° and 30°, separately. The friction between archwire and bracket showed a positive correlation. Conclusion The friction between round arehwire and bracket get higher while the archwire diameter get bigger. The friction between round archwire and bracket get higher while the angle of gable bend get bigger.