Friction properties of orthodontic brackets coated with TiO2-xNy
Li Na, Zhou Hai-jing, Han Bing, Zhang Ying-jie, Cao Bao-cheng
Chinese Journal of Tissue Engineering Research . 2014, (47): 7621 -7626 .  DOI: 10.3969/j.issn.2095-4344.2014.47.014