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The Journal of Adhesive Dentistry
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J Adhes Dent 16 (2014), No. 2     7. Apr. 2014
J Adhes Dent 16 (2014), No. 2  (07.04.2014)

Page 185-191, doi:10.3290/j.jad.a30686, PubMed:24102062


Effect of Restoration Technique on Stress Distribution in Roots with Flared Canals: An FEA Study
Belli, Sema / Eraslan, Öznur / Eraslan, Oğuz / Eskitaşcıoğlu, Gürcan
Purpose: The aim of this finite element analysis (FEA) study was to test the effect of different restorative techniques on stress distribution in roots with flared canals.
Materials and Methods: Five three-dimensional (3D) FEA models that simulated a maxillary incisor with excessive structure loss and flared root canals were created and restored with the following techniques/materials: 1) a prefabricated post: 2) one main and two accessory posts; 3) i-TFC post-core (Sun Medical); 4) the thickness of the root was increased by using composite resin and the root was then restored using a prefabricated post; 5) an anatomic post was created by using composite resin and a prefabricated glass-fiber post. Composite cores and ceramic crowns were created. A 300-N static load was applied at the center of the palatal surface of the tooth to calculate stress distributions. SolidWorks/Cosmosworks structural analysis programs were used for FEA analysis.
Results: The analysis of the von Mises and tensile stress values revealed that prefabricated post, accessory post, and i-TFC post systems showed similar stress distributions. They all showed high stress areas at the buccal side of the root (3.67 MPa) and in the cervical region of the root (> 3.67 MPa) as well as low stress accumulation within the post space (0 to 1 MPa). The anatomic post kept the stress within its body and directed less stress towards the remaining tooth structure.
Conclusion: The creation of an anatomic post may save the remaining tooth structure in roots with flared canals by reducing the stress levels.

Keywords: accessory post, anatomic post, stress distribution, I-TFC post, finite element analysis, endodontic restorations