Setyawardana, E., Sari, W.K.D. and Dayanti, M.E. 2025. Fixed Orthodontic Treatment in Cases of Crowding and Loss of the First Molar of the Lower Jaw: A Case Report: Perawatan Ortodonti Cekat Pada Kasus Berdesakan dan Kehilangan Molar Pertama Rahang Bawah : Studi Kasus. Indonesian Journal of Innovation Studies. 26, 4 (Sep. 2025), 10.21070/ijins.v26i4.1737.