Purpose: The aim of this study was to evaluate the stress distribution of ball and socket attachments in three implant retained mandibular overdenture.

Methodology: Completely edentulous model was constructed by using resin. Three implants were inserted in intraforimnal region two in canine and one in the left central incisor. Three ball attachments were screwed to the implants for creating a model of study. The strain gauges used in this were bonded on the prepared surfaces around middle and right implants to monitor the effect of the vertical load . A universal testing machine was used to apply a vertical static loads (0-150N) on the loading points, Data were collected and statistically analyzed.

Results: There was a significant difference between the middle and the right implant, The values of micro strain in the middle implant was higher the right implant at Bilateral central loading and the right implant was higher than middle one in unilateral loading .At the middle implant the buccal wall recorded the highest micro strain at different loading point except in the Bilateral central loading the micro strain was the same at the buccal and lingual wall .At the right implant lingual wall recorded the highest micro strain at different loading point.

Conclusion: Within the limitations of this study, it can be concluded that there were different patterns of stress-strain distribution around three implant retained mandibular overdenture. The middle implant has recorded a higher statistically significant mean micro-strain than the right implant.