Mostafa M.H., Gehan F.M., Emad M.T. And Amr M.I.,

ABSTRACT

Objectives: The Aim Of This Study Was To Evaluate The Stress Distribution In Atrophied Mandibular Ridges By Using Either Implant Supported Over Denture With Four Mini Implants Or With Two Conventional Implants Through A Finite Element Analysis Method.

Materials and Methods: Three Dimensional Finite Element Analysis Was Used To Compare The Stresses In Mandibular Full-arch Implant-supported Over Dentures Loaded By Simulated Biting Force. A Finite Element Model Derived From An Edentulous Human Mandible With Resorbed Ridge Was Constructed. The Model Was Duplicated Into Two Identical Models Which Were Restored With Implant Supported Mandibular Over Dentures Supported By: Model A; Two Intra-foraminal Standard Diameter Implants And Model B; With Four Mini Implants. A 450-N Load For Each Side Was Applied On Maximum Intercuspation Areas On All Mandibular Arch Teeth.

Results: Model B Showed The Highest Amount Of Stresses On The Peri-implant Bone. While Model A Showed An Approximately 27% Stress Reduction. The Stresses On The Implants Showed Slight Increase In Model A By 1.07%. Conclusion: In Case Of Resorbed Ridge, Using Two Conventional Implants Cause Less Stresses Than Using Four Mini Implants In The Peri-implant Bone While Not Harming The Implants.