Ahmed Mohamed Amer, Ahmed Gamal Hamzawi And Emad MT Mahmoud Agamy,

ABSTRACT
Objective: The Aim Of This Study Was To Compare The Effect Of The Implant Position On Stress Distribution In Bilateral Distal Extension Free End Saddle (Kennedy Class I), Through Three-dimensional Finite Element Analysis (3D FEA). Method: A 3D Finite Element Model Of Mandibular Bilateral Distal Free End Saddle RPD Was Established, Using Single Implant For Support. Three Variant Implant Positions Were Studied; At The Position Of The 2nd Premolar, 1st Molar, And 2nd Molar. Unilateral Vertical Load Of (150 N) Was Applied And Distributed On The Central Fossae Of Posterior Teeth On The Right Side. The Biomechanical Behaviours Of Peri-implant Bone, Implant, Mucosa And Overdenture Were Recorded At Each Situation.

Results: The Highest Stress On Implant And The Surrounding Structures Was In The 2nd Premolar Area. The Best Stress Readings Of The Implant And The Surrounding Structures Were At The 2nd Molar Region, Except For The Periodontal Ligament Buccal Of The Right Canine; At The Same Side Of Load Application. No Overloading Was Recorded At Any Of The Supporting Structures. The Maximum Stresses Occurring At Any Part Were Less Than The Yield Strength Of The Respective Material And Within The Biological Range. Conclusion And Clinical Significance: Within The Limitations Of The Current Study; It Could Concluded That The Best Implant Location For Implant Assisted Bilateral Long Span Distal Extension RPDs, Regarding Stress Distribution, Would Be The 2nd Molar Region. Additional Research Is Recommended And Further Verification Should Be Carried Out In Clinical Cases In Order To Gain A More Accurate Clinical Guidelines.