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Siri Paulo1,2, Pedro Zagalo1, Beatriz Louro1

  • 1Institute of Endodontics, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal.

Dentistry Journal
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PubMed

Keywords:
ProTaper NextProTaper UltimateRACE EVOTruNatomycentering abilitycurved root canalstransportationwear

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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