Nawal nasser Alharbi et al. 2022. CLASSIFICATION AND CLINICAL MANAGEMENT OF RETROGRADE PERI-IMPLANTITIS ASSOCIATED WITH APICAL PERIODONTITIS. Journal of Population Therapeutics and Clinical Pharmacology. 29, 04 (Oct. 2022), 2652–2656. DOI:https://doi.org/10.53555/jptcp.v29i04.5513.