“The Correlation Between Upper Lip Length, Amount of Free Way Space and Visible Portion of Anterior Teeth at Rest Position”. Mustansiria Dental Journal 6, no. 4 (March 28, 2018): 381–388. Accessed July 9, 2025. https://mdj.uomustansiriyah.edu.iq/index.php/mdj/article/view/490.