Y KHAMRCO, Tarik, Rayia J AL-NAIMI, and Ban S AL-MUKHTAR. 2001. “The Effect of Social Class on Periodontal Condition and Treatment Needs of 13-15 Year Old Students in Mosul City - Ninevah : Iraq”. Al-Rafidain Dental Journal 1 (1):78-85. https://doi.org/10.33899/rden.2020.165903.