Chi, P. A.; Tien, T. T. C.; Long, L. Q.; Chi, T. T. K.; Xuan, V. T. K.; Vu, T. T. T. A Study on Periodontal Indices and Contributing Factors in Orthodontic Patients at the University of Medicine and Pharmacy, Hue University. JCMHCH 2025, 17, 131-136.