Kabil A¹,Elsayad M^2,ElmekawyN³. ¹Department of Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt. ²Ass. Prof. of Removable Prosthodontics,Department of Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt. ³Ass. Prof. of Removable ProsthodonticsDepartment of Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt. Abstract: Objectives:This study aimed to analyze the relation between length of edentulous span and implant placement on stress transmission to the abutment implant retaining a bilateral mandibular distal extension removable partial overdenture.. Methods:Four acrylic models were grouped into two equal groups according to the implant position. Group (I), (mesial implant placement): was divided into two equal subgroups according to edentulous span length: Subgroup (1) (long span), Subgroup (2) (short span). Group (II) (distal implant placement): was divided into two equal subgroups according to edentulous span length: Subgroup (3) (long span), Subgroup (4) (short span. Three strain gauges were cemented to the buccal, lingual and distal sides of each implant. Static unilateral (right) loads of 60 N were applied and the stresses were measured. All measurements were repeated ten times for each loading impact, and means were calculated. Results:At the loading side subgroup 3 recorded the greatest strain around the implant and subgroup 2 recorded the lowest strain around the implant. Conclusions:With the limitations of this study, for bilateral mandibular distal extension removable partial overdentures a mesially placed implant may be considered preferable to a distally placed implant from a stress analysis point of view. Keywords: implant placement, mandibular distal extension, removable partial overdenture, stress analysis