Purpose: The present study was performed to radiographically evaluate the effect of two different esthetic clasp designs (RLS clasp and Equipoise clasp) used in bilateral distal extension mandibular partial dentures on bone density and bone height of the free end abutments. Methods: Twenty partially edentulous patients were selected according to specific criteria and divided equally and randomly into two groups; First group: this group received dentures with RLS clasp assembly,(Figure 5) which consists of 1) mesial-occlusal rest 2) distolingual L-bar direct retainer, located on the abutment tooth adjacent to the residual ridge 3) distobuccal stabilizer and, Second group: this group received dentures with equipoise clasp design (E-clasp) on the free end abutment bilaterally that is designed according to GoodmanJ.J (1991) .The bone density and bone height of the last abument teeth were radiographically assessed at the time of denture delivery then 6,9, and 12 months after denture delivery through digital intraoral periapical radiography. Results: The results of this study revealed less bone changes in RLS clasp group in comparison to the equipoise clasp group Conclusions: the RLS clasp tip which is placed on the most distal part of the tooth which undergoes a downward vertical movement and disengages as the distal extension base moves tissue-ward in function and the mesio-occlusal rest that reduces the anterior component of force and reduces torque on the abutment. While the equipoise clasp group showed more bone changes, this may be due to the thick mesial proximal minor connector that might apply extra torque on the abutment. However, the esthetic requirements must be considered in view of the effect of the direct retainer on the supporting structure of the abutment teeth, which means that health and integrity of abutment teeth and its supporting structures should not be sacrified to satisfy the esthetic requirements.