Jung-Yul Cha is a Professor and chair at Orthodontics, Yonsei University, where he completed his orthodontic specialty training in 2002. He was a visiting professor at the University of Southern California (2004-2005) and at Stanford University (2012-2013). He was a deputy editor of the Korean Journal of Orthodontics (KJO). His research focuses on orthodontic treatment with CAD/CAM technology. His recent paper described accuracy of 3D printed model and indirect bonding system were published in 2018, and 2022 of AJODO as a cover issue. He continued to work with the government to establish guidelines for the clinical evaluation of customized medical devices for orthodontic treatment. Recently, he got a special contribution award of Medical device at 2019 from MFDS (Ministry of Food and Drug safety). He has published many scientific articles related to mini-implants and digital dentistry in international journal.