"The Effect of CAD/CAM Zirconia versus Cast Metal Attachment on Retention and Stresses Induced in Kennedy Class One Cases"

Abstract

The study involved two routes in vitro and in vivo investigations conducted on partially edentulous mandibular arch representing Kennedy Class I classification (Bilateral free end saddle). Two materials used in construction of extracoronal attachment retaining removable partial dentures were investigated; according to the material used they were classified into two groups: • Group (I): Casted Co-Cr Extracoronal attachment Retaining Removable Partial Denture. • Group (II): CAD/CAM milled Zirconia attachment Retaining Removable Partial Denture. The in vitro part of the study was performed on 3D experimental model simulating symmetrical Kennedy Class I with the first premolars the last standing abutments for the evaluation of stresses induced in the supporting structure. 3D experimental model simulating symmetrical Kennedy Class I with the first premolars the last standing abutments, was designed to have a periodontal space about 0.25mm was created around root of the abutments simulating the periodontal membrane space. Also