Year : 2024

Volume : Volume 16

Issue : Issue 3

Address for correspondence :
N. Abu Nazar
abunaz706@gmail.com

Abstract

Background of study: The All-on-4 implant technique is a widely used method for full-arch rehabilitation, optimizing bone utilization while minimizing grafting. However, biomechanical complications such as implant failure and bone resorption remain concerns, particularly under varying implant dimensions and loading angles. Finite element analysis (FEA) is an effective tool for evaluating these biomechanical interactions, yet limited research has compared different implant dimensions under varying loading conditions in the All-on-4 system. This study aims to use 3D FEA to evaluate von Mises stress distribution in All-on-4 implants with different dimensions and loading angles, providing insights for optimizing implant design and improving clinical outcomes. Materials and Methods: Geometric models of mandibular structures with distinct implant systems were constructed using Mimics 8.11 and Rapid FORM2004 software. Finite element meshes were generated with Hypermesh 13.0, incorporating material properties and boundary conditions. Loading conditions of 300 N and 500 N were applied vertically and obliquely. Stress analysis, focusing on von Mises stress, was performed using ANSYS 12.1. Results: Group-2 is the group that exhibits higher von Mises stress, peaking at 73.60 MPa under 500N oblique loading in cortical bone, as assessed by the study. Cancellous bone also shows higher stress levels for Group-2, reaching 6.68 MPa under 500N oblique loading. Conclusion: This research confirms that all designs had peak stress points located on the crestal bone on the distal aspect of posterior implants. Longer and wider implants in both cortical and cancellous bone resulted in an increase in von Mises stress.