Ehrami Eilnaz, Omrani Alireza, Feizbakhsh Masood
Department of Orthodontics, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
Front Dent. 2022 Jul 2;19:21. doi: 10.18502/fid.v19i21.9968. eCollection 2022.
This study compared the effects of fluoride mouthwashes on surface topography of orthodontic wires, and static and kinetic frictional forces between the stainless steel (SS) orthodontic brackets and SS and nickel-titanium (NiTi) archwires. This in vitro, study evaluated 240 standard SS maxillary central incisor brackets and 0.018, and 0.025×0.019 inch NiTi and SS archwires. The wire-bracket sets (different combinations of wire diameters and types) were exposed to artificial saliva (control), 0.05% sodium fluoride (NaF) for 1 minute daily, or 0.2% NaF for 1 minute, weekly (37°C) for 3 months. The wires were pulled in bracket slots by 5 mm in a universal testing machine (10 mm/minute). The static and kinetic forces were measured. The surface topography of wires was inspected under a scanning electron microscope (SEM; x500). Data were analyzed by SPSS 25. The mean static and kinetic frictional forces of 0.025×0.019 inch NiTi wire in 0.05% NaF group were significantly greater than SS wire (P=0.000). The mean kinetic frictional force in 0.05% NaF was significantly greater than 0.2% NaF and artificial saliva for all wires (P=0.001). The mean static and kinetic forces in 0.2% NaF were significantly greater than in artificial saliva (P=0.025). In all groups, larger wires showed higher mean frictional forces (P=0.000). SEM results revealed higher wire surface roughness in 0.05% NaF followed by 0.2% NaF group. Weekly use of 0.2% NaF mouthwash is recommended during sliding mechanics to minimize frictional forces between the SS and NiTi wires and SS brackets.
本研究比较了含氟漱口水对正畸钢丝表面形貌以及不锈钢（SS）正畸托槽与SS和镍钛（NiTi）弓丝之间静摩擦力和动摩擦力的影响。这项体外研究评估了240个标准的SS上颌中切牙托槽以及0.018和0.025×0.019英寸的NiTi和SS弓丝。将钢丝 - 托槽组合（不同直径和类型的钢丝组合）暴露于人工唾液（对照）、每天1分钟的0.05%氟化钠（NaF）或每周1分钟的0.2% NaF（37°C），持续3个月。在万能试验机中以5毫米（每分钟10毫米）的速度将钢丝在托槽槽沟中拉动。测量静摩擦力和动摩擦力。在扫描电子显微镜（SEM；×500）下检查钢丝的表面形貌。数据用SPSS 25进行分析。0.05% NaF组中0.025×0.019英寸NiTi钢丝的平均静摩擦力和动摩擦力显著大于SS钢丝（P = 0.000）。对于所有钢丝，0.05% NaF中的平均动摩擦力显著大于0.2% NaF和人工唾液（P = 0.001）。0.2% NaF中的平均静摩擦力和动摩擦力显著大于人工唾液（P = 0.025）。在所有组中，较粗的钢丝显示出更高的平均摩擦力（P = 0.000）。SEM结果显示，0.05% NaF组的钢丝表面粗糙度高于0.2% NaF组。建议在滑动矫治力学过程中每周使用0.2% NaF漱口水，以尽量减少SS与NiTi钢丝以及SS托槽之间的摩擦力。
