E. Helal, M. El-Zawahry, A. Gouda, A. H. Elkhadem, and S. I. Ibrahim, “Bone Height Changes of the Mandibular Edentulous Ridge in Screw Retained Versus Telescopic Restorations for Completely Edentulous Patients”, Open Access Maced J Med Sci, vol. 5, no. 1, pp. 72–78, Jan. 2017.