title: [Clinical management of calcified root canal with Mtwo NiTi files].
abstract: OBJECTIVE
  To evaluate the effect of Mtwo NiTi files in the management of calcified root canals.
  
  
  METHODS
  Thirty-five calcified root canals from 21 cases unsuccessfully prepared with C-Pilot files and EDTA were treated with Mtwo NiTi files and EDTA. The data was analyzed with SAS 9.4 software package.
  
  
  RESULTS
  Twenty-three calcified root canals were successfully prepared. The success rate was 65.71%. Instrument separation occurred in 4 root canals, and ledge occurred in 3 root canals. Categorized by calcified position, the success rate of three groups had no significant differences (P>0.05).
  
  
  CONCLUSIONS
  Mtwo NiTi files can effectively process calcified root canals.
authors.affiliation: Department of General Dentistry,Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China E-mail:zhaojunjun@msn.com.
authors.forename: Jun-jun
authors.initials: JJ
authors.lastname: Zhao
authors.affiliation: Department of General Dentistry,Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China.
authors.forename: Zhuo-jun
authors.initials: ZJ
authors.lastname: Zhou
authors.forename: Jun-li
authors.initials: JL
authors.lastname: Han
authors.forename: Ya-qin
authors.initials: YQ
authors.lastname: Zhu
mesh_terms: D003786:Dental Pulp Cavity; D006801:Humans; D009532:Nickel; D018915:Root Canal Preparation; D012390:Root Canal Therapy; D014025:Titanium
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium