Finite element analysis of different loading conditions for implant-supported overdentures supported by conventional...

Area of Science:

• Biomaterials and Biomedical Engineering
• Dental Implantology
• Biomechanics

Background:

• Implant-supported overdentures are crucial for restoring function in edentulous mandibles.
• Understanding the impact of implant number and type on stability and stress is vital for clinical success.

Purpose of the Study:

• To numerically investigate the effect of varying implant numbers and types (conventional vs. mini) on overdenture stability and stress distribution.
• To compare the biomechanical performance of two, four conventional, and five mini implants supporting mandibular overdentures.

Main Methods:

• Finite element analysis was used to model implant-supported overdentures with different configurations.
• Three models were created: two conventional implants, four conventional implants, and five mini implants.
• Simulations involved applying various loads (120N, 300N) to assess overdenture displacement, bone stress, and implant stress/displacement.

Main Results:

• Four conventional implants demonstrated the lowest bone bed stress and superior overdenture stability compared to two conventional or five mini implants.
• Overdenture displacement increased significantly with five mini implants compared to four conventional implants.
• While stresses in bone and implants remained below critical limits, conventional implants generally showed better biomechanical outcomes than mini implants in this configuration.

Conclusions:

• Four conventional implants provide enhanced stability and optimal stress distribution for mandibular implant-supported overdentures.
• Conventional implants generally outperform mini implants in terms of stability and stress management for overdentures.
• The number and type of implants significantly influence biomechanical performance, but all tested configurations remained within safe stress limits.