Biocompatibility of dentinal tubules in human extracted teeth closed with fluoride nano-hydroxyapatite  
Wang Jian-ping1, Zhou Li-bo2, Yue Hong-xia3
Chinese Journal of Tissue Engineering Research . 2012, (16): 2951 -2954 .  DOI: 10.3969/j.issn.1673-8225.2012.12.024