“Comparison Between Two Different Design Concepts of 4- Implant Assisted Mandibular Complete Overdenture:- Periimplant Bone Height Changes ”. International Journal of Scientific Research and Management (IJSRM), vol. 9, no. 11, Nov. 2021, pp. 452-6, https://doi.org/10.18535/ijsrm/v9i11.mp01.