Article

Cyclic fatigue resistance of two variable-taper rotary file systems: ProTaper universal and V-Taper.

Wilford Hall U.S.A.F. Medical Center, Lackland Air Force Base, TX 78236, USA.
Journal of endodontics (impact factor: 2.95). 05/2009; 35(4):555-8. DOI:10.1016/j.joen.2009.01.002
Source: PubMed

ABSTRACT The cyclic fatigue resistance of ProTaper Universal (Dentsply Tulsa Dental Specialties, Tulsa, OK) and V-Taper (Guidance Endo, Albuquerque, NM) files was measured while rotating files around a 5-mm radius curve with 90 degrees of maximum flexure. The files were rotated at 250 rpm with a continuous axial oscillation of 4 mm at 1 Hz. The number of cycles to failure was calculated and analyzed by using univariate analysis of variance and the Tukey HSD posthoc test with results confirmed by nonparametric Kruskal-Wallis and Mann-Whitney U tests with a Bonferroni correction. The fracture faces of representative files were imaged with a scanning electron microscope to confirm cyclic fatigue as the mode of fracture. For the instruments tested, the ProTaper files appeared to resist fracture better than the V-Taper files. At each tip size tested, the ProTaper files either outperformed or were not statistically different than V-Taper files.

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    Article: Instrument separation analysis of multi-used ProTaper Universal rotary system during root canal therapy.
    Jintao Wu, Gang Lei, Ming Yan, Yan Yu, Jinhua Yu, Guangdong Zhang
    [show abstract] [hide abstract]
    ABSTRACT: The purpose of this study was to identify the influential factors responsible for clinical instrument separation of reused ProTaper Universal rotary instruments (Dentsply Maillefer, Ballaigues, Switzerland). Six thousand one hundred fifty-four root canals in 2,654 teeth were prepared using ProTaper Universal files in endodontic clinics. Separation incidence was determined based on the number of treated teeth or canals. Data were collected including the size of fractured instrument, the length and location of a broken segment within the root canal, and the curvature of canal. The chi-square test and independent samples t test were used to determine the statistical significance. The overall instrument separation incidences were 2.6% according to the number of teeth and 1.1% according to the canal number, respectively. Separation incidences according to the number of teeth or canals were significantly higher (P < .05) in molars than those in premolars or anterior teeth. Because of its largest diameter, F3 file presented the highest separation incidence according to the number of teeth (1.0%) or canals (0.4%); 47.5% instrument separation of mandibular molars and 61.5% instrument separation of maxillary molars happened in the mesiobuccal canals. Moreover, 91.4% fragments were located in the apical third of root canals, and 54.2% instrument separation occurred in severely curved canals. There was a significant difference (P < .05) in the mean fracture length between shaping (2.42 ± 0.73 mm) and finishing files (3.32 ± 0.73 mm). Separation incidence according to the canal number is more reliable than that according to the number of teeth because of the variable canal number in different teeth. The tooth type, rotary file size, canal location, and anatomy were correlated with the instrument separation of reused ProTaper Universal files.
    Journal of endodontics 06/2011; 37(6):758-63. · 2.95 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

5-mm radius curve
 
Albuquerque
 
Bonferroni correction
 
continuous axial oscillation
 
cyclic fatigue
 
cyclic fatigue resistance
 
Dentsply Tulsa Dental Specialties
 
Guidance Endo
 
Mann-Whitney U tests
 
maximum flexure
 
nonparametric Kruskal-Wallis
 
ProTaper files
 
ProTaper Universal
 
representative files
 
rotating files
 
scanning electron microscope
 
tip size
 
Tukey HSD posthoc test
 
univariate analysis
 
V-Taper files
 

Sterling J Whipple