title: Comparison of defects in ProFile and ProTaper systems after clinical use.
abstract: The purpose of this study was to compare the incidence and mode of instrument separation of the two nickel-titanium (NiTi) rotary systems that were used according to a predefined schedule of clinical use by the same group of operators. A total of 166 ProFile and 325 ProTaper instruments, discarded from this endodontic clinic over 17 months, was analyzed. The incidences of instrument separation were 7% for ProFile and 14% for ProTaper (p < 0.05). The proportion of unwinding defects was 5% in ProFile and 0.3% in ProTaper instruments (p < 0.01). Flexural fatigue was implicated in the majority of separations in both groups. The results of this study indicated that while ProTaper was more likely to separate without warning, ProFile tended to exhibit unwinding of flutes more frequently.
authors.affiliation: Department of Operative Dentistry and Endodontics, School of Stomatology, Wuhan University, Luoyu Road, Wuhan City, P.R.China 430079.
authors.forename: Ya
authors.initials: Y
authors.lastname: Shen
authors.forename: Gary Shun-pan
authors.initials: GS
authors.lastname: Cheung
authors.forename: Zhuan
authors.initials: Z
authors.lastname: Bian
authors.forename: Bin
authors.initials: B
authors.lastname: Peng
mesh_terms: D003722:Dental Alloys; D003762:Dental Instruments; D003799:Dental Stress Analysis; D004868:Equipment Failure; D017743:Equipment Reuse; D006801:Humans; D009532:Nickel; D018583:Pliability; D018915:Root Canal Preparation / Q000295:instrumentation*; D014025:Titanium; D019415:Torque
chemical_list: D003722:Dental Alloys; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium