Al Jabbari Youssef S, Koutsoukis Theodoros, Al Hadlaq Suliman, Berzins David W, Zinelis Spiros
Dental Biomaterials Research and Development Chair, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia.
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, P.O. Box 60169, Riyadh 11545, Saudi Arabia.
J Dent Sci. 2016 Mar;11(1):48-53. doi: 10.1016/j.jds.2015.07.004. Epub 2015 Nov 19.
BACKGROUND/PURPOSE: Although the effect of experimental surface modifications on various properties (e.g., fatigue, wear) on coated files have been tested in the past, there is no report for the coating quality of commercially available TiN coated files. The aim of this study was to characterize the surface and cross section of TiN coated endodontic files.
TiN coated nickel-titanium endodontic files (EasyShape) were surface and cross-sectionally analyzed via scanning electron microscopy backscattered electron imaging and energy-dispersive X-ray spectroscopy analysis in spot, area, and line scan modes.
Surface imaging revealed parallel oblong regions with higher mean atomic contrast, a finding attributed to increased Ni content. Cross-sectional analysis showed that the coating's average total thickness was 0.31 μm and consisted of a thin layered film. Energy-dispersive X-ray spectroscopy analysis revealed the presence of Ti, Ni, N, and O in the coating, whereas only Ni and Ti were identified in the bulk of the file. Ti and O showed their peak compositions at the bulk/coating and coating/surface interfaces, respectively, whereas N displayed a rather constant content within the coated region. The N and O contents started increasing inner to the coating/bulk interface, denoting possible diffusion of both elements to the subcoating region.
Surface and bulk characterization showed no uncoated areas of the files tested. Apart from Ti, Ni, and N, oxygen was also identified within the coating region.
背景/目的：尽管过去已经测试了实验性表面改性对涂层锉各种性能（如疲劳、磨损）的影响，但尚无关于市售TiN涂层锉涂层质量的报道。本研究的目的是表征TiN涂层根管锉的表面和横截面。
采用扫描电子显微镜背散射电子成像以及能谱分析的点扫描、面扫描和线扫描模式，对TiN涂层镍钛根管锉（EasyShape）进行表面和横截面分析。
表面成像显示出具有较高平均原子对比度的平行长方形区域，这一发现归因于镍含量的增加。横截面分析表明，涂层的平均总厚度为0.31μm，由一层薄膜组成。能谱分析显示涂层中存在钛、镍、氮和氧，而在锉的主体部分仅鉴定出镍和钛。钛和氧分别在主体/涂层和涂层/表面界面处显示出峰值组成，而氮在涂层区域内的含量相当恒定。氮和氧的含量在涂层/主体界面内部开始增加，表明这两种元素可能扩散到涂层下区域。
表面和主体表征显示，所测试的锉没有未涂层区域。除了钛、镍和氮之外，涂层区域内还鉴定出了氧。
