Pankhem N, Lertpimonchai A , Sompeewong P. “Gingival Zenith of the Maxillary Anterior and Premolar Teeth in Normal Gingiva”. Journal of The Department of Medical Services 45, no. 3 (January 4, 2021): 107–115. Accessed April 25, 2024. https://he02.tci-thaijo.org/index.php/JDMS/article/view/248644.