title: [Mesio-distal fracture of the posterior crown and root: Analysis of the causes]
authors.affiliation: Department of Endodontidc, School of Stomatology, Ninth People's Hospital, School of Stomatology,Shanghai Second Medical University. Shanghai 200011, China.
authors.forename: Y M
authors.initials: YM
authors.lastname: Gu
authors.forename: Y L
authors.initials: YL
authors.lastname: Huang