Influence of thermal or chemical degradation on the frictional force of an experimental coated NiTi wire
Influence of thermal or chemical degradation on the frictional force of an experimental coated NiTi wire
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DOI：
10.2319/042810-232.1
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发表时间：
2011-05-01
影响因子：
3.4
通讯作者：
da Costa, Marysilva Ferreira
中科院分区：
文献类型：
--
作者：
Bezerra Bandeira, Ana Maria;Alves dos Santos, Marcia Pereira;da Costa, Marysilva Ferreira
目的：评价由涂层NiTi弓丝、经受热循环的涂层NiTi和经受酸溶液浸泡的涂层NiTi组成的滑动系统中的摩擦力，并将其与NiTi和聚合物丝进行比较。材料和方法：NiTi（n = 05）、涂层NiTi（n = 15）和OPTIS（n = 05）直径为0.016英寸、长为50 mm的样本，连同InVu托槽中的Metafasix结扎线和唾液一起进行摩擦测试。在15个涂覆NiTi的样品中，5个经受3000个循环的热循环;另外5个样品在酸溶液中浸泡30天。结果在P > 0.05或P > 0.01时进行统计学分析。结果：NiTi、涂层NiTi和OPTIS的平均（+/-标准差）最大摩擦力分别为105.20 +/-（2.63）; 99.65 +/-（0.64）; 59.76 +/-（4.93）（P = 0.000）。NiTi、涂层NiTi和酸浸涂层NiTi之间无显著差异（P > 0.05）。在热循环或酸浸涂层NiTi金属丝中，经历热循环的金属丝摩擦力较低（P = .001）。涂层NiTi和OPTIS呈现均匀表面，而NiTi导丝呈现不均匀表面。结论：OPTIS、热循环涂层NiTi、涂层NiTi、NiTi和酸浸涂层NiTi的最大摩擦力分别增加。（角度正交2011;81：484-489）。
Objective: To evaluate the friction force in sliding systems composed of coated NiTi archwires, coated NiTi subjected to thermal cycling, and coated NiTi subjected to acid solution immersion, and compare them to NiTi and polymeric wires. The null hypothesis is that there will be no difference among the wires as to friction force.Materials and Methods: Samples of NiTi (n = 05), coated NiTi (n = 15), and OPTIS (n = 05) 0.016 inches in diameter and 50 mm long, in conjunction with Metafasix ligatures and saliva in InVu brackets, were submitted to friction testing. Among the 15 coated NiTi samples, 5 were submitted to thermal cycling for 3000 cycles; the other 5 samples were immersed in acid solution for 30 days. The results were statistically analyzed at P > .05 or P > .01. Microscopic analysis was performed in the coated NiTi wires before and after thermal cycling and acid solution immersion.Results: The mean (+/- standard deviation) maximum friction force for NiTi, coated NiTi, and OPTIS was 105.20 +/- (2.63); 99.65 +/- (0.64); 59.76 +/- (4.93) (P = .000), respectively. There was no significant difference in NiTi, coated NiTi, and acid-immersed coated NiTi (P > .05). Among the thermal-cycled or acid-immersed coated NiTi wires there was lower friction force in those undergoing thermal cycling (P = .001). The coated NiTi and the OPTIS presented homogeneous surfaces, whereas NiTi wires presented a heterogeneous surface. Fractures were observed in the coated NiTi wires that underwent thermal cycling.Conclusion: OPTIS, thermal-cycled coated NiTi, coated NiTi, NiTi, and acid-immersed coated NiTi presented, respectively, increasing values of maximum friction force. (Angle Orthod. 2011;81:484-489.)