Ion Release and Surface Changes of Nickel-Titanium Archwires Induced by Changes in the pH Value of the Saliva-Significance for Human Health Risk Assessment.
Ion Release and Surface Changes of Nickel-Titanium Archwires Induced by Changes in the pH Value of the Saliva-Significance for Human Health Risk Assessment.
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DOI：
10.3390/ma15061994
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发表时间：
2022-03-08
期刊：
影响因子：
--
通讯作者：
Katić V
中科院分区：
文献类型：
--
作者：
Jusufi Osmani Z;Poljšak B;Zelenika S;Kamenar E;Marković K;Perčić M;Katić V
本研究的目的是探讨唾液pH值的变化是否会影响不同表面涂层的NiTi弓丝的机械性能、表面粗糙度和离子释放，并讨论其临床意义。将未涂覆、镀铑和氮化的NiTi丝浸入不同pH值(4.8、5.1、5.5和6.6)的人工唾液中。28d末用电感耦合等离子体发射光谱仪测定镍、钛离子的释放量。用原子力显微镜测量了表面的算术平均粗糙度Ra、均方根粗糙度Rq和粗糙度最大高度Rz。测量了纳米压痕硬度(HIT)和杨氏弹性系数(EIT)。人工唾液pH值的变化与涂层和未涂层金属丝的钛释放量以及未涂层金属丝的镍释放量成反比。涂层和未涂层金属丝的表面粗糙度参数不受人工唾液pH值变化的影响。唾液pH值的变化对涂层和未涂层金属丝的硬度和杨氏弹性模量影响不大。测量的释放金属离子浓度低于推荐的每日摄入量上限；然而，即使在较低浓度和低pH值下，也不能排除过敏效应。
The aim of this study was to explore whether changes in the salivary pH influence mechanical properties, surface roughness, and ion release from NiTi archwires with various surface coatings, and discuss the clinical significance of the findings. The uncoated, rhodium-coated, and nitrified NiTi wires were immersed into artificial saliva of different pH values (4.8, 5.1, 5.5, and 6.6). Released nickel and titanium ions were measured with inductively coupled plasma-optical emission spectroscopy at the end of 28 days. Atomic force microscopy was used to measure the arithmetic average surface roughness Ra, the root-mean-square roughness Rq, and the maximum height of the asperities RZ. The nanoindentation hardness (HIT) and Young’s modulus (EIT) measurements were performed. The change in the pH of artificial saliva is inversely proportional to the release of titanium from both coated and uncoated wires, and the release of nickel from uncoated wires. The surface roughness parameters of both coated and uncoated wires are unaffected by the change in the pH of artificial saliva. The change in the pH of saliva has minor influence on the hardness and Young’s modulus of elasticity of both coated and uncoated wires. The concentration of released metal ions measured was below the recommended upper limit for daily intake; nevertheless, hypersensitivity effects cannot be excluded, even at lower concentrations and at low pH.
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