Sari, S. P., Lubis, M. M., & Yusuf, M. (2022). Labial and palatal alveolar bone changes during maxillary incisor retraction at the Universitas Sumatera Utara Dental Hospital. Dental Journal, 55(3), 148–153. https://doi.org/10.20473/j.djmkg.v55.i3.p148-153