The use of functionally graded dental crowns to improve biocompatibility: a finite element analysis

Abstract

In post-core crown restorations, the significant mismatch between stiffness of artificial crowns and dental tissues leads to stress concentration at the interfaces. The aim of the present study was to reduce the destructive stresses by using a class of inhomogeneous materials called functionally graded materials (FGMs). For the purpose of the study, a 3-dimentional computer model of a premolar tooth and its surrounding tissues were generated. A post-core crown restoration with various crown materials, homogenous and FGM materials, were simulated and analyzed by finite element method. Finite element and statistical analysis showed that, in case of oblique loading, a significant difference (p < 0.05) was found at the maximum von Mises stresses of the crown margin between FGM and homogeneous crowns. The maximum von Mises stresses of the crown margin generated by FGM crowns were lower than those generated by homogenous crowns (70.8 vs. 46.3 MPa) and alumina crown resulted in the highest von Mises stress at the crown margin (77.7 MPa). Crown materials of high modulus of elasticity produced high stresses at the cervical region. FGM crowns may reduce the stress concentration at the cervical margins and consequently reduce the possibility of fracture.

Mandibular bone remodeling around osseointegrated functionally graded biomaterial implant using three dimensional finite element model

“…One particular notice is that unlike the existing studies in literature 22,[29][30][31] wherein the FGM dental implant was modeled as a multi-layered configuration with evenly sized layers of graded material properties; the present study proposes continuum property with gradient nature to model FGM implant. Indeed, in order to reflect the true layout of continuous FGM material, the material properties of the Ti/HAP FGM are assumed to vary smoothly through the length direction of the implant using Gauss quadrature integration method for composite section implemented in Abaqus software.…”

“…The convergence test shows that the 0.5 mm size elements are accurate enough T A B L E 1 Material properties used in this study. 1,30,31,[35][36][37]…”

Effect of biomimetic material on stress distribution in mandibular molars restored with inlays: a three-dimensional finite element analysis

“…With the development of material science, some scholars have begun considering manufacturing complete crowns using functionally graded materials in recent years (Mahmoudi et al, 2018). Traditional modeling approaches cannot be used if the material of the prostheses is inhomogeneous.…”

“…Recently, the bio-anthropomorphic materials have become a popular field of study in biomedicine to restore as much physiological function as possible; furthermore, biomimetic materials with location-dependent elastic modulus values may be produced in the future via new technologies, such as three-dimensional printing. Some studies have assessed the feasibility of the application of functionally graded material in prosthetic dentistry (Zhang et al, 2012; Mahmoudi et al, 2018). Restorative materials with different elastic moduli used in the restored teeth could affect the repair effect, which can be explained by the change in stress distribution partly from the standpoint of mechanics (Magne & Belser, 2003).…”

A Review on Buckling Analysis of Functionally Graded Plates Under Thermo-Mechanical Loads

“…Other important applications of FGMs are in the medical field. FGMs have been intensively investigated as biomaterials [10,11], especially in dentistry as dental implants and crowns [12,13], bone plates [14], bone implants [15] and knee joints [16].…”