Ehab A. Elsaih. "Implant-supported distal extension mandibular partial overdenture: comparison of two attachment types effect on mandibular posterior residual alveolar bone (five year retrospective study)". Egyptian Dental Journal, 66, Issue 2 - April (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), 2020, 1317-1326. doi: 10.21608/edj.2020.23975.1007