Fiber post-and-core crown or onlay for restoration choice of mandibular first premolar with large defect:A three-dimensional finite element analysis
ZHANG Xiao-Xia
HAN Ding
ZHU Qin-lin
Wang Jiang
SUN Han-tang
Abstract：AIM:To determine the critical range of onlay or fiber post-and-core crown in the treatment of mandibular first premolar with large defect using three-dimensional finite element stress analysis. METHODS:Three-dimensional finite element models of mandibular first premolar with different defects(residual dentin is located at 2mm a-bove the gingival margin)were respectively established: crown with 2 axial wall defects(group A); crown with 3 axial wall defects( group B);crown with all axial wall defects( group A) . Simulations of pile fiber post-and-core crown and onlay restorations were respectively performed for each group, then stress intensity and stress distribution were analyzed following loading by using the software ANSYS. RESULTS:The maximum Von-Mises stress for residual dental tissues is displayed in all onlay groups, that in onlay group A, B and C was 81. 475 MPa, 79. 808 MPa and 78. 658 MPa respec-tively, between each 2 groups, P>0. 05, between onlay and fiber post-and-core crown groups, P>0. 05. CONCLU-SION:The 3 kinds of tooth defect can be restored by onlay or fiber post-and-core crown, however, the onlay method is the better way to restore the crown with 2 axial wall defect and the crown with 3 axial wall defect, and the fiber post-and-core crown method is the better way to restore the crown with all axial wall defect.
Keywords：fiber post-and-core crownonlaylarge defectmandibular first premolarThree-dimensional fi-nite element analysis
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 265-269 )