7Lertchirakann V, Palamara J E A, Messer H H. Patterns of vertical root fracture: Factors affecting stress distribution in the root canal [J]. J Endod, 2003, 29(8) :523-528.
8Lertchirakarm V, Palamara J E A, Messer H H. Finite element analysis and strain gauge studies of vertical root fracture[J]. J Endod, 2003,29(8) :529-534.
9Chan C P, Lin C P, Tseng S C, et, al. Vertical root fracture in endodontically versus nonendodonticaUy treated teeth: a survey of 315 cases in Chinese patients[J]. Oral Sury Oral Med Oral Pathol Oral Radio Endod, 1999,87(4):504-507.
