Yawer Aldalawi, D. M., D. H. Saeed, and S. H. Ali. “Effect of Different Methods for the Overhang Amalgam Restorations Removal on Periodontal Health Status”. Polytechnic Journal, vol. 10, no. 1, June 2020, pp. 61-67, doi:10.25156/ptj.v10n1y2020.pp61-67.