Khan, W. U., Abdullah, S., khan, I. and Jan, H. U. (2015) “Effect of non-extraction orthodontic treatment of impacted and malposed maxillary canines on upper lip strain and thickness”, Pakistan Orthodontic Journal, 7(1), pp. 25–29. Available at: https://www.poj.org.pk/index.php/poj/article/view/111 (Accessed: 13 June 2026).