In-vitro and Radiographic Study to Investigate the Presence of Second Mesio-buccle Canal (MB2) in First Upper Molar. مجلة الجامعة [Internet]. 2020 Nov. 24 [cited 2026 Apr. 26];3(10). Available from: https://hama-univ.edu.sy/ojs/index.php/huj/article/view/435