title: [Maxillary second molar with two buccal and two lingual root canals: a case report].
abstract: Incidence rate of 4 root canals in maxillary second molar is very low and most molars have only two mesiobuccal root canals. The emergence of 4 root canals in maxillary second molar with two lingual root canals is especially rare. A case of 4 root canals maxillary second molar with two lingual root canals was successfully treated and reported in this article.
authors.affiliation: Stomatological Center of Nanjing Military Command, The 411 Hospital of PLA, Shanghai 200081, China.
authors.forename: Qing-Fu
authors.initials: QF
authors.lastname: Zhang
authors.forename: Guo-Qin
authors.initials: GQ
authors.lastname: Liu
authors.forename: Hai-Jun
authors.initials: HJ
authors.lastname: Zhao
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Xin-Hai
authors.initials: XH
authors.lastname: Zhang