Biomechanical Stress Analysis of Overdentures Supported and Retained by Peek Implants and Attachments Using Different Designs : A 3D Finite Element Analysis Study

Document Type : Original Article

Authors

1 Lecturer of dental biomaterials, Al-Ryada university for science and technology

2 Lecturer of Prosthodontics- Faculty of Dental Medicine – King Salman international University – Egypt

3 Professor of Applied Mechanics - Mechanical Engineering Department, National Research Centre (NRC), Egypt.

4 Associate professor of Dental Biomaterials- Faculty of Dental Medicine – King Salman international University – Egypt & Associate professor of Dental Biomaterials - Faculty of Dental Medicine – Suez Canal University – Egypt

5 Assistant professor of Biomaterials – Prosthetic dentistry department- Faculty of Dental Medicine – King Salman international University – Egypt

Abstract

Background: Analysis of stresses induced by using poly ether ether ketone (PEEK) implants and prosthetic attachments for implant supported mandibular complete overdenture. Methods: 3D finite element model was made for lower complete overdenture, supported by implants (4 mm in diameter, 12 mm in length) and retained by ball attachments. Linear static stress analysis was carried out by ANSYS 2020. Three model cases were created. Model 1 supported by two Ti implants in canine region, Model 2 supported by three PEEK implants (2 in canine region, 1 in midline), Model 3 supported by 4 PEEK implants bilaterally in canine and premolar region. Same material either titanium alloy or PEEK was used in modelling all prosthetic components in each case model. Application of force (120 N) bilaterally was carried out 3 times for each model case (vertical, oblique and lateral). Results: Model 3 showed the highest maximum and minimum principal stresses, in peri-implant cortical bone and exceeded its tensile and compressive yield strength after lateral loading. In model 2 Cortical bone Maximum and minimum principal stresses did not exceed its yield strength, in the three loading scenarios. However, cortical bone tensile stresses labial to midline implant in model 2 showed low safety factor. Conclusions: Model 2 design can be promising biomechanically, if used in normal density bone, but with caution against the critical high tensile stresses at the cortical bone labial to midline implant. While model 3 design could result in excessive high stresses leading to yielding and resorption of cortical bone.

Keywords

Main Subjects

Egyptian Dental Journal
Volume 71, Issue 1 - Serial Number 4
January (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
January 2025
Pages 507-521

Files

Share

How to cite

Statistics