3-D finite element analysis of the effects of post location and loading location on stress distribution in root canals of the mandibular 1st molar

Abstract

Objective The purpose of this study was to evaluate, by using finite element analysis, the influence of post location and occlusal loading location on the stress distribution pattern inside the root canals of the mandibular 1st molar.Material and Methods Three different 3-D models of the mandibular 1st molar were established: no post (NP) – a model of endodontic and prosthodontic treatments; mesiobuccal post (MP) – a model of endodontic and prosthodontic treatments with a post in the mesiobuccal canal; and distal post (DP) – a model of endodontic and prosthodontic treatments with a post in the distal canal. A vertical force of 300 N, perpendicular to the occlusal plane, was applied to one of five 1 mm2 areas on the occlusal surface; mesial marginal ridge, distal marginal ridge, mesiobuccal cusp, distobuccal cusp, and central fossa. Finite element analysis was used to calculate the equivalent von Mises stresses on each root canal.Results The DP model showed similar maximum stress values to the NP model, while the MP model showed markedly greater maximum stress values. The post procedure increased stress concentration inside the canals, although this was significantly affected by the site of the force.Conclusions In the mandibular 1st molar, the distal canal is the better place to insert the post than the mesiobuccal canal. However, if insertion into the mesiobuccal canal is unavoidable, there should be consideration on the occlusal contact, making central fossa and distal marginal ridge the main functioning areas.

Endocrown restorations: Influence of dental remnant and restorative material on stress distribution

“…Between the tooth and the fixation cylinder, the contact was considered perfectly bonded. In all groups, the model fixation occurred at the base of the polyurethane cylinder with fixed zero nodal displacements [11], and an axial load of 300 N [16][17][18][19] was applied to the occlusal surface based on the tripoidism concept [20][21][22]. A mesh convergence test (10%) was performed to guarantee that it would not interfere with the results [23].…”

New Dental Implant with 3D Shock Absorbers and Tooth-Like Mobility—Prototype Development, Finite Element Analysis (FEA), and Mechanical Testing

“…Its use is found in device testing and even tissue-response anticipation to certain devices or forces [35]. Studies have been conducted in general dentistry [36], endodontics [37,38], orthodontics, and especially oral implantology. Any implant test can be simulated (in vitro and in vivo), with almost immediate results and with a fraction of the cost of the physical tests.…”

Monolithic and semi-monolithic translucent zirconium-dioxide restorations : aspects on design, material and strength

“…Several factors influence the accuracy of the results of these calculations, such as type, arrangement, and number of elements of structure of interest. [122][123][124][125] In general, the initial steps of the FEM of simulated loads start with creating a finite element model with appropriate mesh density, followed by identifying proper material properties for each component. In later steps, by setting up the loading conditions and boundaries according to the proposed assumptions, the model can be accurately tested.…”

“…119 Other laboratory studies use computational (digital) testing methods for analysing and obtaining information about the internal behaviour of the tested specimens such as the finite element method (FEM). [120][121][122][123][124][125] In contrast to experimental investigations on real in vitro or in vivo specimens, FEM has many benefits. It is a repeatable method that might be modified as it is needed, and there are no considerations for ethical approvals.…”

“…In the field of dentistry, recent years have witnessed a growing academic interest in FEM as a research tool for analysing stress and deformations on structures of interest such as implants, bone, different kinds of teeth preparations, and post and core restorations. [120][121][122][123][124][125] The FEM of simulated occlusal loads can also be used to optimize the shape of restorations by studying the internal stress within teeth and restorations with different dental materials and designs.…”