Effect of implant support on different retention systems and their load distribution in a distal extention removable partial denture

Aim of the study was to evaluate the effect of implant support on different retention systems and their load distribution in a Distal Extension Removable partial denture. Materials and Methods: Three hemimandible models with canine to canine teeth were simulated. Model 1: Conventional cast partial denture with I – bar. Model 2: Cast partial denture with extracoronal ball attachment on the distal abutment. Model 3: Cast partial denture with extracoronal ball attachment and after a distal implant placement with healing abutment. Masticatory load of 150 N was applied in the vertical direction along the long axis of the denture teeth. Load was applied on the buccal cusps and central fosse of the premolar and the molars. Results: decrease in the displacement of the distal end of the RPD with the placement of Implant in second molar region for Extra – Coronal Attachment retained RPDs. It showed 10 times reduction in stress concentration in primary abutment after placement of distal Implant in second molar region for the Extra – coronal Attachment retained RPD. Conclusion: Extracoronal retained RPD with a distal implant reduces the stress on the primary abutment and the underlying bone. Denture displacement of the distal extension bases was also recorded to be least of all the models.