Nalbantgil Didem, Ulkur Feyza, Kardas Gulfeza, Culha Mustafa
Department of Orthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
Physical Chemistry Department, Faculty of Arts and Sciences, Cukurova University, Adana, Turkey.
Biomed Mater Eng. 2016 Nov 25;27(5):539-549. doi: 10.3233/BME-161607.
Patients use mouthwashes in addition to mechanical cleaning during orthodontic treatment. The effects of mouthwashes on the archwires have not been examined yet.
To compare the corrosion resistance of four different arch wires and corrosion effects of different mouthwashes to formulate a biocompatible and mechanically useful arch wire and mouthwash combination.
Each group comprised of 4 wire samples of 2 cm 0.016 × 0.022 inch. 1st group: ion implanted nickel titanium (INT), 2nd group: nickel titanium, without ion implantation (NT), 3rd group: micro layered esthetic nickel titanium (ENT), 4th group: stainless steel (SS) wires. They were immersed inside 2 ml of artificial saliva solutions (AS) for the control, or AS (9%) combined with 1 of the 3 mouthwashes (91%) for study groups, for 24 hours. These mouthwashes were essential oil (EO), chlorhexidine (CHX), sodium-fluoride (NaF). An electrochemical analyzer was used for electrochemical impedance spectroscopy measurements.
High corrosion resistance was obtained for ENT than the other wires. The corrosion potentials are 0.007, -0.042, 0.074 and -0.015 V (Ag/AgCl) for ENT, INT, SS and NT in the artificial salivary, respectively. In NaF containing mouthwash Rp value of ENT is significantly high in comparison to others. The impedance responses of all materials increased significantly in the presence of NaF mouthwash as well as in the CHX mouthwash. Low frequencies are seen at all materials in EO mouthwash. Diameters of loops are 22, 5.9, 5.9 and 3.7 MΩ at ENT, INT, SS and NT.
In this study, micro layered esthetic nickel titanium wires are found biocompatible among other wires and NaF and CHX mouthwashes can be recommend for their good corrosion resistance during fixed orthodontic therapy.
正畸治疗期间，患者除了进行机械清洁外，还会使用漱口水。然而，漱口水对弓丝的影响尚未得到研究。
比较四种不同弓丝的耐腐蚀性以及不同漱口水的腐蚀作用，以制定出生物相容性良好且机械性能优良的弓丝与漱口水组合。
每组由4根2厘米长、0.016×0.022英寸的弓丝样本组成。第一组：离子注入镍钛合金（INT），第二组：未进行离子注入的镍钛合金（NT），第三组：微层美观镍钛合金（ENT），第四组：不锈钢（SS）弓丝。将它们浸泡在2毫升人工唾液溶液（AS）中作为对照组，或浸泡在AS（9%）与三种漱口水之一（91%）混合的溶液中作为研究组，浸泡24小时。这些漱口水分别是精油（EO）、氯己定（CHX）、氟化钠（NaF）。使用电化学分析仪进行电化学阻抗谱测量。
ENT弓丝的耐腐蚀性高于其他弓丝。在人工唾液中，ENT、INT、SS和NT的腐蚀电位分别为0.007、-0.042、0.074和-0.015 V（Ag/AgCl）。在含NaF的漱口中，ENT的Rp值相比其他弓丝显著更高。在含NaF漱口水以及CHX漱口中，所有材料的阻抗响应均显著增加。在EO漱口中，所有材料均出现低频现象。ENT、INT、SS和NT的环路直径分别为22、5.9、5.9和3.7 MΩ。
在本研究中，发现微层美观镍钛合金弓丝在其他弓丝中具有生物相容性，并且由于NaF和CHX漱口水在固定正畸治疗期间具有良好的耐腐蚀性，因此可以推荐使用。
