Comparison of two subperiosteal implant designs in total maxillectomy: A 3-D finite element analysis

Abstract

Objective

This study aims to compare two different subperiosteal implant designs using three-dimensional finite element analysis (FEA) and to investigate the load distribution on the prosthetic components and the surrounding bone.

Material and Method

This study was conducted using a 3D representation of a Class II fully resected maxillary bone, generated. Two treatment scenarios were developed: SC-1 featured a conventional subperiosteal design, and SC-2 applied a diagonal bar design in the zygomatic region. A total force of 450 Newtons in a vertical direction and 93 Newtons in an oblique force were applied to mimic mastication forces. The maximum and minimum principal stress values on bone and von Mises stress (VMs) values on implant components' were measured.

Results

The results showed that under vertical forces, the SC-2 design exhibited higher maximum stress (Pmax) values in the zygomaticomaxillary area. Under oblique forces, stress values were higher in SC-2 in both areas compared to SC-1. VMs values on the screws were lower in SC-1 under vertical forces, while under oblique forces, they were lower in SC-2.

Conclusion

The findings suggest that the SC-2 design did not provide significant advantages over the conventional subperiosteal implant design. Future studies should focus on enhancing the conventional design by incorporating support from different anatomical areas.