“Quality of Life Evaluation in Titanium/Peek Andtitanium/Co-Crdouble Crown Systemin Implant- Retained Mandibular Overdenture (Randomized Controlled Trial)”, IJPHRD, vol. 11, no. 3, pp. 1984–1989, Mar. 2020, doi: 10.37506/ijphrd.v11i3.2233.