Nawal nasser Alharbi, “CLASSIFICATION AND CLINICAL MANAGEMENT OF RETROGRADE PERI-IMPLANTITIS ASSOCIATED WITH APICAL PERIODONTITIS”, J Popl Ther Clin Pharmacol, vol. 29, no. 04, pp. 2652–2656, Oct. 2022, doi: 10.53555/jptcp.v29i04.5513.