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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Vertical Root Fracture in Upper Premolars with Endodontic Posts: Finite Element Analysis

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Author(s):
Santos, Andrea F. V. [1] ; Tanaka, Carina B. [1] ; Lima, Raul G. [2] ; Esposito, Camila O. M. [1] ; Ballester, Rafael Y. [1] ; Braga, Roberto R. [1] ; Meira, Josete B. C. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Sch Dent, Dept Dent Mat, BR-05508000 Sao Paulo - Brazil
[2] Univ Sao Paulo, Dept Mech Engn, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF ENDODONTICS; v. 35, n. 1, p. 117-120, JAN 2009.
Web of Science Citations: 30
Abstract

Upper premolars restored with endodontic posts present a high incidence of vertical root fracture (VRF). Two hypotheses were tested: (1) the smaller mesiodistal diameter favors stress concentration in the root and (2) the lack of an effective bonding between root and post increases the risk of VRF. Using finite element analysis, maximum principal stress was analyzed in 3-dimensional intact upper second premolar models. From the intact models, new models were built including endodontic posts of different elastic modulus (E = 37 or E = 200 GPa) with circular or oval cross-section, either bonded or nonbonded to circular or oval cross-section root canals. The first hypothesis was partially confirmed because the conditions involving nonbonded, low-modulus posts showed lower tensile stress for oval canals compared to circular canals. Tensile stress peaks for the nonbonded models were approximately three times higher than for the bonded or intact models, therefore confirming the second hypothesis. (J Endod 2009;35:117-120) (AU)