Biomechanical Comparative Evaluation of Atrophic Edentulous Maxilla Rehabilitation Using the All-on-Six Concept with Zygomatic Implant and Tilted Implant as Posterior Implant-Finite Element Analysis.

Abstract

<b>Background:</b> All-on-six implants are a reliable and efficient full-arch restoration option in patients with atrophic maxilla. <b>Aim:</b> The present study aimed to evaluate and compare the distribution of stress surrounding implants and adjacent osseous structures by utilizing all-on-six tilted and zygomatic methodologies in the maxillary region by using finite element (FEA) analysis. <b>Materials and Methods:</b> Two finite element models were constructed with CT images of 50-year-old female. Model 1 was constructed with zygomatic implants, while model 2 was constructed with tilted implants. A vertical force of 150 N on the anterior component and 300 N on the posterior component were applied and maximum stress and deformation was assessed. <b>Results:</b> In the present study, the von Mises stress on the bone and implant overall was higher in the tilted implant model than the zygomatic implant model. <b>Conclusions:</b> The findings of the present study suggests that zygomatic implants help distribute occlusal loads more favourably, especially under horizontal and combined loading conditions in an all-on-six configuration.