Bachground: Mandibular implant-retained overdentures combined with remaining natural canine help preservation of residual ridge height and increase retention and stability of overdentures. Telescopes transfer forces along the long axis of the abutments and provide guidance, support, and protection from movements that might dislodge the denture. Purpose: This study will be conducted to compare between two concepts for implants retained telescopic mandibular overdentures used to rehabilitate a completely edentulous mandibular arch with only remaining single retainable canine. Materials and Methods: For group I:One osseeointegrated implant fixture was inserted in the edentulous mandible in the canine region. For group II:Three osseointegrated implant fixtures were inserted in the edentulous mandible one in the canine region and two were inserted in second premolar region. Resilient telescopes were fabricated for the abutments. Horizontal bone loss was evaluated by periapical radiographs in both groups. Results: For canines, GI recorded significant higher HBLO than GII at T6 and T12. For group I, canines and anterior implants demonstrated insignificant difference in HBLO between observation times. For group II, canines, anterior and posterior implants demonstrated insignificant difference in HBLO between observation times. Conclusions:Within limitation of this study, it can be concluded that the amount of bone degradation around dental implants used as abutments after teeth and implants are connected is usually within a range of acceptable bone loss for free standing implants.