Refractory apical periodontitis associated with a calculus-like deposit at the root apex

Cheng-Mei Yang, Yao-Dung Hsieh, Shue-Fen Yang
2010 Journal of Dental Sciences  
doi:10.1016/s1991-7902(10)60015-3 fatcat:jdplux762ja35glsne6qmqjjcu