title: [Clinical analysis of fine root canal preparation with ProTaper rotary instruments].
abstract: OBJECTIVE
  To evaluate the clinical effects of fine root canal preparation with rotary ProTaper.
  
  
  METHODS
  Ninety-two teeth among 92 patients were treated with root canal therapy which root canals prepared by rotary ProTaper with Glyde gel (contains EDTA) and lateral condensation, including 66 teeth that 141 root canals were fine,17 teeth being root canal therapy and one or more than root canal were omitted,6 maxillary first molar containing second mesiobuccal canal(MB2), 3 maxillary second molar MB2.
  
  
  RESULTS
  One hundred and thirty five in 141 fine root canals among 66 teeth were successfully prepared by rotary ProTaper, the prepared successful ratio was 95.74%,X-ray showed that obturator had smooth taper. Two palatal root canals of maxillary first molar were underfilling, 4 root canals appeared ledge at apical one third. Seventeen omitted root canals were successfully prepared and obturated. Five in 9 MB2 were successfully prepared and obturated to root-apex, four in 9 were not to end. No instrument separated in all patients.
  
  
  CONCLUSIONS
  The preparation of fine root canals with rotary ProTaper and EDTA is an effective and safe and limited. Nevertheless, the preventive importance of ledge and perforation should be emphasized.
authors.affiliation: Department for VIP, Guangdong Provincial Stomatological Hospital, Guangzhou 510280 China. zhuangzx833@163.com
authors.forename: Zui-xin
authors.initials: ZX
authors.lastname: Zhuang
authors.forename: Fei
authors.initials: F
authors.lastname: Ren
authors.forename: Zhen-feng
authors.initials: ZF
authors.lastname: He
mesh_terms: D000328:Adult; D000368:Aged; D003762:Dental Instruments; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018915:Root Canal Preparation / Q000295:instrumentation*