Comparison of four cordless gingival displacement systems: A clinical study Mohammad M. Rayyan, BDS, MSc, PhD, Nagwa M. Sayed, BDS, MSc, PhD, c a Ahmed Naguib M. Hussien, BDS, MSc, PhD, Rima Abdallah, BDS, CAGS, DSc, Nayer Abo El Saad, BDS, MSc, PhD, 2019
