Luft S, Keilig L, Jäger A, Bourauel C
University of Bonn, Bonn, Germany.
Orthod Craniofac Res. 2009 Feb;12(1):43-51. doi: 10.1111/j.1601-6343.2008.01436.x.
The number of bracket systems for orthodontic therapy increases significantly. One major concern of newly developed orthodontic devices is aspects of corrosion and biocompatibility.
In this study, nine bracket systems made of different material and from various design principles were tested with respect to their corrosion behavior. Electrochemical and static immersion tests with subsequent measurement of nickel ion release were performed. In addition surface alterations of the brackets after corrosion were documented by scanning electron microscopy. Studies of corrosion behavior were performed according to the DIN/ISO standard 10271 for corrosion testing of dental materials.
All systems showed traces of corrosion after electrochemical testing. However, after static immersion testing only minor corrosion defects could be documented and the measured nickel ion release was far below critical limits.
All tested systems seem to be biocompatible and applicable for orthodontic therapy. The measured nickel values are far below the daily dietary intake level. A static immersion test combined with the nickel ion release measurement seems to be more relevant for the determination of biocompatibility than the electrochemical testing.
正畸治疗中使用的托槽系统数量显著增加。新开发的正畸器械的一个主要问题是腐蚀和生物相容性方面。
在本研究中，对九种由不同材料和基于各种设计原则制成的托槽系统的腐蚀行为进行了测试。进行了电化学和静态浸泡试验，随后测量镍离子释放量。此外，通过扫描电子显微镜记录了腐蚀后托槽的表面变化。根据DIN/ISO标准10271对牙科材料进行腐蚀测试，开展了腐蚀行为研究。
电化学测试后，所有系统均显示出腐蚀痕迹。然而，静态浸泡试验后，仅能记录到轻微的腐蚀缺陷，且测得的镍离子释放量远低于临界限值。
所有测试系统似乎都具有生物相容性，适用于正畸治疗。测得的镍值远低于每日膳食摄入量水平。与电化学测试相比，静态浸泡试验结合镍离子释放测量似乎对生物相容性的测定更具相关性。
