Evaluation of Maximum Principal Stress, Von Mises Stress, and Deformation on Surrounding Mandibular Bone During Insertion of an Implant: A Three-Dimensional Finite Element Study

Abstract

Aim The present study evaluated maximum principal stress, von Mises stress, and deformation on the mandible and surrounding structures during the insertion of an implant in various anatomical positions. Materials and Methods Finite element models of straight two-piece implants of 4.5 mm × 11.5 mm were modeled using Ansys software, v. 16.0 (Ansys, Inc., Houston, TX, USA). The mandibular model was derived through cone-beam computed tomography of a cadaveric mandible using Mimics software (Materialise NV, Leuven, Belgium). An osteotomy was performed at the first molar region, second premolar region, lateral incisor region, central incisor region, canine region, and second molar region that had varying bone densities. Implant insertion was simulated with a variable load of 1-180 Newton, which was applied axially downward with a rotational velocity of 30-120 rpm. Maximum principal stresses, von Mises stress distribution at the implant insertion site, and maximum deformation on the entire mandible were recorded during the insertion of the implants. Results Maximum principal stress was highest in the crestal area of the right first molar region and least in the middle third of the central incisor region during implant insertion. Von Mises stress in the mandible was highest in the right first molar region and the least in the lateral incisor region during implant insertion. The extent deformation was recorded on the x-axis, y-axis, and z-axis of the mandible. Deformation on the x-axis was highest at the crestal region of the canine and least for the lateral incisor. On the y-axis, deformation was highest at the symphysis region during implant insertion at the first molar region and the least at the condylar area during implant placement in the canine area. On the z-axis, the deformation was highest at the

Evaluation of Stress Distribution during Insertion of Tapered Dental Implants in Various Osteotomy Techniques: Three-Dimensional Finite Element Study

“…It can determine the behavior of a structure subjected to a certain load through a mathematical model. Previous studies have successfully used the finite element method (FEM) in examining dental implants [17][18][19][20].…”

Design of patient specific basal dental implant using Finite Element method and Artificial Neural Network technique

“…It is observed that the von Mises stress and strain in the bone-implant model are in a close range (within 620%) with the previous research work done on the implanted bone. 33,[65][66][67][68][69][70][71]73,75 It is observed that microstrain for the soft bone condition is higher than that of hard bone conditions. From the above graph of Figure 8, it is observed that the microstrain for the normal bone varies from 1500 to 2500 microstrain, and for hard bone, the microstrain varies within the range of 1000-2000 microstrain, and for soft bone, it varies from 2500 to 4000 microstrain.…”

“…In the present work, experimental analyses of numerical study have not been performed, but the implant stress and peri implant-bone strain are validated based on previous literature. 19,33,72,73,75 The material properties assigned to the mandibular bone would be almost close to reality if a CT scan of the cadaveric mandible could be done within a few hours, but it is carried out after collecting the mandible within a few days from different medical colleges across West Bengal, India. So there are the chances that the material properties used in our analyses may slightly differ from reality.…”

Three-dimensional Finite Element Analysis of the Effect of Alveolar Cleft Bone Graft on the Maxillofacial Biomechanical Stabilities of Unilateral Complete Cleft Lip and Palate

“…The von Mises principle, also known as the maximum deformation energy principle, is often used to estimate the yielding of ductile materials [29].von Mises stresses are mathematically calculated from components of compressive, shear and tensile stresses [40][41].Since von Mises stresses provide a clear depiction of the stress variations throughout the whole structure, it is a widely used EQV stress in biomechanical researches [42]. von Mises destruction theory has a certain amount of appropriateness and validity [29], it is one of the gold standards for evaluating bone stress distributions [43], therefore, EQV stresses were adopted as the indexes for analysis of maxillofacial bone biomechanical variations.…”