Department of Dentistry, Postgraduate Program in Dentistry, Cruzeiro do Sul University (UNICSUL), São Paulo, Brazil.
Departament of Orthodontics, Universidade Paulista (UNIP), São Paulo, Brazil.
Microsc Res Tech. 2020 Aug;83(8):928-936. doi: 10.1002/jemt.23486. Epub 2020 Mar 31.
This study was undertaken to assess in vivo the corrosion in two commercial nickel-titanium (NiTi) orthodontic archwires removed from the oral cavity of patients using fluoride mouthwashes. Five volunteers took part in this study on the corrosion behavior of two brands of NiTi archwires (3M and AO (brand of archwire)) during use of two mouthwashes with neutral sodium fluoride 1.1%, one with acidulated fluoride 1.1%, and one with placebo and a control group. Each patient used one mouthwash in three different periods of time for 1 min a day for 30 days. The archwires were assessed with scanning electron microscopy and atomic force microscopy for qualitative and quantitative analysis. The values obtained with atomic force microscopy (AFM) were submitted to normality test, two-way analysis of variance, and Tukey's test at a significance level of 5%. The AFM images showed a gradual qualitative increase in the roughness of both types of wire between the treatments: control < placebo < neutral fluoride < acidulated fluoride. The arithmetic average of the roughness and root mean square of the roughness were similar. As for 3M archwires, only the acidulated fluoride group differed statistically from the others. As for AO archwires, the control and placebo groups did not differ from each other, but differed from the other fluoride treatments. The group using neutral fluoride also differed significantly from the acidulated fluoride group. 3M archwires were not affected by daily oral challenges. AO archwires were not affected by daily oral challenges either; their association with fluoride, either neutral or acidulated, increased their roughness.
本研究旨在评估两种商用镍钛（NiTi）正畸弓丝在患者使用含氟漱口水后的体内腐蚀情况。五名志愿者参与了这项研究，研究了两种品牌的 NiTi 弓丝（3M 和 AO（弓丝品牌））在使用两种含中性氟 1.1%的漱口水、一种含酸性氟 1.1%的漱口水和一种含安慰剂的漱口水时的腐蚀行为，以及一个对照组。每位患者在 30 天的时间里，每天使用一种漱口水，每天使用三次，每次使用 1 分钟。使用扫描电子显微镜和原子力显微镜对弓丝进行定性和定量分析。原子力显微镜（AFM）获得的值进行正态性检验、双向方差分析和 Tukey 检验，显著水平为 5%。AFM 图像显示，两种类型的弓丝在处理之间的粗糙度逐渐定性增加：对照组<安慰剂<中性氟<酸性氟。粗糙度的算术平均值和均方根粗糙度相似。对于 3M 弓丝，只有酸性氟组与其他组在统计学上存在差异。对于 AO 弓丝，对照组和安慰剂组彼此之间没有差异，但与其他氟化物处理组存在差异。使用中性氟化物的组也与酸性氟化物组有显著差异。3M 弓丝不受日常口腔挑战的影响。AO 弓丝也不受日常口腔挑战的影响；它们与中性或酸性氟化物的结合增加了它们的粗糙度。
