Mechanical Study of Optimal Implant Position for Maxillary Implant-Supported Overdentures Using Three-Dimensional...

Area of Science:

• Biomaterials Science
• Dental Implantology
• Biomechanics

Background:

• Maxillary implant-supported overdentures (MIODs) offer improved function and aesthetics.
• Determining optimal implant placement is crucial for long-term success and patient comfort.
• Finite element analysis (FEA) is a valuable tool for simulating biomechanical forces in dental applications.

Purpose of the Study:

• To identify the ideal positioning of implants for maxillary implant-supported overdentures (MIODs) using finite element analysis (FEA).
• To evaluate the impact of implant number and location on stress distribution and denture displacement.

Main Methods:

• Construction of 3D finite element models of the maxilla, including mucous membrane, denture, and teeth.
• Simulation of four models: no implant, two implants (lateral incisor or first premolar), and four implants (lateral incisor and first premolar regions).
• Application of occlusal load to analyze denture displacement and stress distribution in bone and mucous membrane.

Main Results:

• Maximum stresses on bone and mucous membrane were highest in premolar and anterior areas, respectively.
• Bone stress concentrated around implants; mucous membrane stress concentrated along the posterior margin.
• The four-implant model exhibited the least denture displacement; implant angle influenced stress distribution but not displacement.

Conclusions:

• Optimal implant positioning enhances overdenture stability and minimizes stress on surrounding tissues.
• Implant placement in the premolar region and perpendicular orientation to the occlusal plane reduce stress.
• FEA provides critical insights into biomechanical behavior for optimizing MIOD design.