Sirikururat, Papatpong, and Supranee Benjapupatthananan. 2019. “Relationship Between Smile Line, Gingival Biotype, Tooth Shape, and Gingival Zenith of Maxillary Anterior Teeth in a Group of Thai Young Adults”. Mahidol Dental Journal 39 (2). Bangkok, Thailand:107-14. https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/182102.