Rukiah, B.A., Oeripto, A. and Harahap, N. 2017. A Comparison of class I malocclusion treatment outcomes with and without extractions using an ABO grading system for dental casts and radiographs. Dental Journal. 50, 3 (Sep. 2017), 144–148. DOI:https://doi.org/10.20473/j.djmkg.v50.i3.p144-148.