How does canal taper affect root stresses?

International Endodontic Journal
B D Rundquist, A Versluis

Abstract

To examine the effect of specific tapers on root stresses and thus vertical root fracture. The effect of taper on root stresses was calculated during simulated warm vertical compaction of gutta-percha in a straight rooted premolar for three tapers (0.04, 0.06 and 0.12 mm mm(-1)) using finite element analysis. Stresses in the dentine were observed whilst the root was filled with three subsequent gutta-percha increments. Each increment was compacted at 10 or 15 N and the gutta-percha cooled down to 37 degrees C. After filling, composite was polymerized in the access space. A functional occlusal load of 50 N was then applied on the buccal cusp incline. The stress distribution in the root during the occlusal loading was compared with the stresses during filling. During filling, the highest stresses were found: (a) at the canal surface; (b) using the smallest taper; (c) in the apical third; and (d) during the first gutta-percha increment. The root stress distribution changed when the functional post-filling load was applied. It generated the highest stresses at the external root surface, with a tensile stress concentration at the lingual surface of the cervical third. Since the stresses during simulated masticatory loading concentra...Continue Reading

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Aug 6, 2010·BMC Oral Health·Khaled Q Al HamadAhmad S Al Hyiasat
Oct 13, 2015·Dental Materials : Official Publication of the Academy of Dental Materials·Yu XiongMikako Hayashi
Nov 30, 2011·Dental Materials Journal·Pablo-Jesús Rodríguez-CervantesLeopoldo Forner-Navarro
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Jun 8, 2021·Australian Endodontic Journal : the Journal of the Australian Society of Endodontology Inc·Clarissa Teles RodriguesMarco Antonio Hungaro Duarte

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