Tengrungsun, Tasanee, Pachinee Kosakul, Onrudee Suratanasurang, and Theeralaksna Suddhasthir. 2020. “A study of dentinal microcracks in root canal wall after root canal preparation by hand file and three different engine-driven file systems”. Mahidol Dental Journal 40 (2). Bangkok, Thailand:77-86. https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/234557.