S Minwah, B. 2017. Pre-Emptive Analgesic Effect of Tramadol and Ibuprofen After Impacted Mandibular Third Molar Extraction. Al-Rafidain Dental Journal. 17, 1 (Sep. 2017), 76–85. DOI:https://doi.org/10.33899/rden.2016.164141.