A finite element analysis study on different angle correction designs for inclined implants in All-On-Four protocol

Area of Science:

• Biomechanical Engineering
• Dental Implantology
• Finite Element Analysis

Background:

• The All-On-Four treatment protocol offers a full-arch rehabilitation solution using four strategically placed implants.
• Investigating the biomechanical performance of different posterior implant configurations is crucial for treatment success.

Purpose of the Study:

• To compare the biomechanical behavior of angle-corrected dental implants versus implants with angled multiunit abutments within the All-On-Four protocol using finite element analysis (FEA).

Main Methods:

• Two 3D finite element models of an edentulous mandible were created, each with four implants.
• Model I featured distally placed angle-corrected implants (24-degree correction), while Model II used conventional implants with angled multiunit abutments (25-degree inclination).
• Axial and inclined loads were applied, and equivalent Von-Misses stresses (VMS), maximum principal stresses, and deformation were analyzed.

Main Results:

• Model II (angled multiunit abutment) exhibited greater deformation (13.286 μm) and Von-Misses stresses (246.68 MPa) compared to Model I (angle-corrected implant).
• Model I showed higher maximum principal stresses (107.83 MPa) than Model II (94.988 MPa), though this difference was not statistically significant.
• The Ti mesh in Model II experienced higher stress and deformation.

Conclusions:

• Angle-corrected implant designs demonstrate more favorable biomechanical outcomes, with reduced model deformation and Von-Misses stresses compared to angled multiunit abutments.
• Correction at the implant level appears more effective for managing stress and deformation than correction at the abutment level in the All-On-Four protocol.