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Bui, C., Bich, L. and Hien, H. 2022. Research on clinical characteristics and clinical healing assessment after endodontic surgery using ultrasonic tip and root -end filling material by MTA. Science and Technology Development Journal: Health Sciences. 3, 2 (Dec. 2022), 443-451. DOI:https://doi.org/https://doi.org/10.32508/stdjhs.v3i2.524.