Effect of vitapex on bone regeneration following refractory periapical periodontitis  
Jin Hui, Wang Xiu-mei, Ge Ya-na, Zhang Cheng-ren, Zhu Lan-lan, Xu Ye
Chinese Journal of Tissue Engineering Research . 2012, (12): 2277 -2280 .  DOI: 10.3969/j.issn.1673-8225.2012.12.044