Assma Ahmed Salim¹,AhmedKhalifaKhalifa²MoustafaAbdou El-sayad³ 1. Msc candidate at Removable prosthodontics Department- Mansoura University . 2.Lecturer at Removable prosthodontics Department- Mansoura University             3.Professor at Removable prosthodontics Department- Mansoura University Abstract: Purpose:This study aimed to evaluate the effect of lingual implant inclination on stresses around two-implant-retained overdentures with resilient stud attachments Materials and methods:Four acrylic models representing a mandibular edentulous ridge were constructed. For each model, two implants were placed at canine areas. Models were classified into four types according to the degree of lingual implant inclination: Group I (GI, 0 degrees), Group II (GII, 5 degrees), Group III (GIII, 10 degrees), and Group IV (GIV, 20 degrees). Overdentures were connected to the implants with Locator attachments. Regular light-retention inserts were used for all groups, and extended range inserts were also used for GIV (GIVext), making a fifth comparison group. Four strain gauges were bonded at the buccal, lingual, mesial, and distal surfaces of each implant to monitor the stresses during bilateral and unilateral load application. Results: At different sites of strain gauges: Buccal and lingual strain gauges recorded the highest microstrain values, and mesial and distal gauges recorded the lowest values (without significant difference in between) . And at 20^o pink recorded the highest microstrain values, and 0^o pink recorded the lowest values. Conclusion: During unilateral and bilateral loading at the majority of strain gauge positions, 20^o pink recorded the highest strain, and 20^o red recorded the smallest strain. This means as the strain increased as lingual implant inclination increase except when red insert was used.