Ahmed Mohammed Salah, Mohammed Ezzat Elsayed, Sayed Mohammed Elmasry And Moataz Mostafa Bahgat Elmahdy,

ABSTRACT
The Purpose Of This Study Was To Evaluate The Effect Of Metal And Acetal Removable Partial Denture (RPD) Framework Materials On The Stresses Around Implant Supported Removable Partial Dentures. Material And Methods : The Study Was Carried Out On Mandibular Epoxy Class I Partially Edentulous Models With Two Parallel Implants Placed At Lower First Molar Area And According To Framework Materials, Two Groups Were Created: Group I : Acetal Partial Denture Framework, Group II: Metallic Partial Denture Framework, For Both Groups Acrylic Record Block With Metal Plate Was Made And Adjusted To Apply Occlusal Force On The Center Of The Metal Plates, Regarding The Models From The Right And Left Side, Stress Analysis Images Were Recorded For Both Groups At Stresses From 20 To 100 Newton, Using Photoelastic Machine And Means Of Stress Values Were Recorded For Both Groups, Tabulated And Statistically Analyzed.

Results: There Was A Difference In Means Of Stress Values Between Acetal And Metallic Partial Denture Frameworks Where Metallic Partial Denture Framework Showed Higher Stress Fringes Order Around Implant Compared To Acetal Denture Base.

Conclusions: Within The Limitations Of This In-vitro Photoelastic Analysis, The Following Was Concluded : Acetal Partial Denture Frameworks Were Preferred To Use With Implant Supported Removable Partial Denture When Compared With Metal Partial Denture Frameworks, For Preservation Of Bone Around Implant, Acetal Denture Bases Is The Treatment Of Choice.