The aim of the study is to appraise the stress distribution in tooth-supported and implant-supported mandibular overdentures with different attachment systems. The objective is to evaluate & compare stress distribution between1) Tooth-supported and implant supported overdentures with the ball attachment 2) Tooth-supported and implant supported overdentures with bar attachments 3) Implant supported overdentures having ball and bar attachments. A three-dimensional finite element solid model of the human mandible was constructed based on CT data. Two mathematical models were created which include the tooth-supported overdenture, implant-supported overdenture that was supported by two mandibular canines and two implants respectively and then the denture was retained using ball attachment and bar attachment. These were done with the help of software ANSYS version 15.0 and hardware of Intel Pentium 4 and Windows XP.The axial 100N loading conditions will be introduced on the anterior region between canines and in the posterior region at molar areas. Then the calculation of Von Mises stresses and comparison of stress distribution between tooth-supported overdenture and implant-supported overdenture retained by ball attachment, tooth-supported overdenture and implant-supported overdenture retained by bar attachment, implant-supported overdenture retained by ball and bar attachment will be done. This study concluded that implant-supported overdentures, the magnitude of stress was higher compared to tooth-supported overdentures. Meanwhile, Ball attachments demonstrated greater stress compared to bar attachment. However, there was no significant difference between the stress magnitudes in both the groups; hence either of them can be used based on the clinical scenario.
Key words: Finite element analysis, Overdentures, Ball and Bar attachments, Von Mises stress.