Numerical three-dimensional finite element modeling of cavity shape and optimal material selection by analysis of stress distribution on class V cavities of mandibular premolars

Abstract

A BSTRACT Aim: Adhesive restoration does not depend primarily on the configuration of the shape of the cavity. Under varying loading conditions, it is essential to know the stress concentration and load transfer mechanism for distinct cavity shapes. The aim of this study was to evaluate and compare the biomechanical characteristics of various cavity shapes, namely oval, elliptical, trapezoidal, and rectangular shapes of class V cavities on mandibular premolars restored with amalgam, glass ionomer cement, and Cention N using three-dimensional (3D) finite element analysis. Materials and Methods: A 3D prototype of a mandibular premolar was generated by Digital Imaging and Communications in Medicine (DICOM) images obtained from the cone beam computed tomography and imported to 3D modeling software tool, SpaceClaim. The four distinct load magnitudes of 100, 150, 200, and 250N were applied as a pressure load perpendicular to the lingual plane of the lingual cusp of the occlusal surface (normal load) and at 45° to same (oblique load). The stress distribution patterns and the maximum von Mises stresses were analyzed and compared. Results: The occlusal stresses were distributed from the force loading point in an approximate actinomorphic pattern, and when the force load was close to the margin, the stress was much greater. Conclusion: Ovoid cavity showed lesser stress concentration and deformation for each of the tested restorative material.

Mechanical Behavior of Alkasite Posterior Restorations in Comparison to Polymeric Materials: A 3D-FEA Study

“…The present study applied the computer-aided design and finite element method (CAD-FEM) as a bioengineering tool to calculate the stress distribution in molar Class I restorations. This method has been extensively applied to investigate the mechanical behavior in different dental fields [2,6,9,[17][18][19][20], including operative dentistry [2], dental materials evaluation [6], restoration concepts in molars [9,19] and premolars [17], and implant therapy [20]. The three-dimensional (3D) model definition is presented in Figure 1.…”

“…Poisson ratio Enamel [18] 84.1 0.33 Dentin [18] 18 0.30 Bulk-fill resin composite [22] 12.0 0.25 Flowable resin composite [22] 8.0 0.25 Glass ionomer cement [17] 10.8 0.30 Alkasite [19] 13.0 0.3 The response of the six restored models was assessed by the computer-aided engineering software (ANSYS 19.2, ANSYS Inc., Houston, TX, USA). All models were discretized using 4-node tetrahedral elements with a total size extending from 0.08 mm to 0.18 mm.…”

“…Finite element analysis has been widely used to investigate bulk-fill restorations behavior [9] and more recently Alk performance for Class V cavities [9,17,18]. Therefore, by means of 3D FEA, this study aims to investigate the mechanical behavior of different bulk-fill materials with and without the presence of a polymeric or a ionic base material in molar Class I restorations.…”

Análise da distribuição de forças resultantes de contato oclusal prematuro entre primeiros pré-molares: Um estudo 3D de elementos finitos

“…As forças mastigatórias aplicadas fora do eixo dentário longitudinal normalmente geram forças laterais que são dissipadas principalmente na junção amelocementária, consequentemente, o dente fica deformado e ocorrem desconexões entre os cristais de hidroxiapatita na área de tensão, resultando em microrrupturas. A ruptura cria espaços repletos de moléculas de água que impedem a formação de novas conexões químicas entre os cristais, tornando as estruturas cristalinas vulneráveis à ação química e às forças físicas geradas por processos fisiológicos ou mecânicos (Lim et al, 2020;Pai et al, 2020). Essa perda adicional da estrutura dentária muitas vezes resulta em lesões cervicais não cariosas (NCCLs), uma das principais causas da sensibilidade dentária (Medeiros et al, 2020;Correia et al, 2020).…”

Avaliação de forças resultantes de contato oclusal prematuro entre primeiros molares: Um estudo 3D de elementos finitos

“…Forças oclusais excessivas podem causar microfraturas na coroa do elemento dentário e fratura radicular, podendo causar a perda do elemento dentário (Correia et al, 2020). Além disso, rupturas do esmalte dentário podem criar espaços que são preenchidos com moléculas de água, o que impedem a formação de novas conexões químicas, tornando vulneráveis à ação química e às forças físicas geradas por processos fisiológicos ou mecânicos (Lim et al, 2020;Pai et al, 2020). Essa perda adicional da estrutura dentária muitas vezes resulta em lesões de cáries ou lesões cervicais não cariosas (NCCLs), uma das principais causas da sensibilidade dentária (Medeiros et al, 2020;Correia et al, 2020).…”