TY - JOUR
T1 - Vertical Root Fracture in Upper Premolars with Endodontic Posts
T2 - Finite Element Analysis
AU - Santos, Andrea F.V.
AU - Tanaka, Carina B.
AU - Lima, Raul G.
AU - Espósito, Camila O.M.
AU - Ballester, Rafael Y.
AU - Braga, Roberto R.
AU - Meira, Josete B.C.
N1 - Funding Information:
Supported by FAPESP (05/53069-1, 07/00191-0) and CNPq.
PY - 2009/1
Y1 - 2009/1
N2 - 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.
AB - 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.
KW - Biomechanics
KW - endodontic posts
KW - endodontically treated teeth
KW - finite element analysis
KW - root fracture
UR - http://www.scopus.com/inward/record.url?scp=57149133786&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=57149133786&partnerID=8YFLogxK
U2 - 10.1016/j.joen.2008.09.021
DO - 10.1016/j.joen.2008.09.021
M3 - Article
C2 - 19084139
AN - SCOPUS:57149133786
SN - 0099-2399
VL - 35
SP - 117
EP - 120
JO - Journal of Endodontics
JF - Journal of Endodontics
IS - 1
ER -