Ibrahim S, Al Nakkash W. Mechanical evaluation of nano hydroxyapatite, chitosan and collagen composite coating compared with nano hydroxyapatite coating on commercially pure titanium dental implant. J Bagh Coll Dent [Internet]. 15Jun.2017 [cited 30Nov.2019];29(2):42-8. Available from: http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/1859