: Evaluation of stress distribution patterns in monocortical and bicortical bone anchorages around single tantalum implants: Finite element study

Abstract

Purpose. The aim of this study was to evaluate the distribution of stress around single tantalum implants in maxillary monocortical and bicortical bone anchorages by means of finite element analysis. Materials and methods. using ABAQUS software, two types of posterior maxillary bone models withD density were designed as monocortical and bicortical, and in each model, once a tantalum implant and then a solid titanium implant was used. Four models were created.The components represented masticatory force of N in the angle of approximately degrees to the occlusal plane.Then the results of stress were recorded in three parts of the implantand three surrounding bone areas. Results. Theuse of tantalum implants in both monocortical and bicortical groups caused a slight increase in stress in the coronal cortical bone.Also, the application of biocortical method in both types of implants was associated with a slight increase in stress in the coronal cortical bone. The stress distribution in the cancellous bone was almost the same in all models. But the application of biocortical method in both types of implants increased stress in the apical cortical bone.The distribution of stress in the neck of the implant was almost the same in all models.On the other hand,stress in the middle of tantalum implants was significantly lower than titanium implants. Bicortical method doubled the stress in the apex of implants. Conclusion.Use of tantalum implants increased stress in coronal cortical bone, so there does not seem to be much difference between treatment results with this type of implant and titanium implant. On the other hand, use of biocortical method was associated with increased stress in the coronal cortical bone and does not seem to have an advantage for the continued survival of implants.