Department of Dentofacial Orthopedics and Orthodontics, Wroclaw Medical University, Krakowska Street 26, 50-425 Wroclaw, Poland.
Department of Mechanics, Materials Science and Engineering, Wroclaw University of Technology, Smoluchowskiego Street 25, 50-370 Wroclaw, Poland.
Biomed Res Int. 2016;2016:5268629. doi: 10.1155/2016/5268629. Epub 2016 Dec 14.
Exceptional properties of the NiTi archwires may be jeopardized by the oral cavity; thus its long-term effect on the mechanical and physiochemical properties of NiTi archwires was the aim of work. . Study group comprised sixty 0.016 × 0.022 NiTi archwires from the same manufacturer evaluated (group A) after the first 12 weeks of orthodontic treatment. 30 mm long pieces cut off from each wire prior to insertion formed the control group B. Obeying the strict rules of randomization, all samples were subjected to microscopic evaluation and nanoindentation test. Both groups displayed substantial presence of nonmetallic inclusions. Heterogeneity of the structure and its alteration after usage were found in groups B and A, respectively. Long-term, reliable prediction of biomechanics of NiTi wires in vivo is impossible, especially new archwires from the same vendor display different physiochemical properties. Moreover, manufacturers have to decrease contamination in the production process in order to minimize risk of mutual negative influence of nickel-titanium archwires and oral environment.
镍钛弓丝的特殊性能可能会受到口腔的影响；因此，研究工作旨在探讨镍钛弓丝长期作用对其力学和理化性能的影响。研究组包括 60 根相同制造商生产的 0.016×0.022 英寸镍钛弓丝（A 组），这些弓丝在正畸治疗的前 12 周内进行了评估。从每根弓丝上截取 30mm 长的一段作为对照组 B。所有样本均严格遵循随机分组原则，进行微观评估和纳米压痕试验。两组均显示出大量非金属夹杂物的存在。B 组和 A 组的结构存在异质性，且分别在使用后发生了改变。对镍钛弓丝在体内生物力学的长期、可靠预测是不可能的，特别是来自同一供应商的新弓丝表现出不同的理化性能。此外，制造商必须减少生产过程中的污染，以最大程度降低镍钛弓丝和口腔环境相互负面影响的风险。
