K. TantipanichkulSupatchai BoonprathamNathaphon TangjitSuwannee LuppanapornlarpMahidol University2020-01-272020-01-272019-12-01Orthodontic Waves. Vol.78, No.4 (2019), 160-168134402412-s2.0-85075973439https://repository.li.mahidol.ac.th/handle/20.500.14594/50698© 2019 Elsevier Ltd and the Japanese Orthodontic Society Purpose: To determine whether pre-treatment orthodontic case complexities were associated with their treatment outcomes in each category of malocclusion. Materials and methods: Two hundred orthodontic cases treated with edgewise appliances from university clinic that satisfied requirements for the certification were studied. The Discrepancy Index (DI) and the Objective Grading System (OGS) were calculated. The relationship between these measurements was evaluated using Pearson's correlation coefficient. Results: The mean DI score was 23.67 ± 10.30, and the mean OGS score was 19.92 ± 6.92. Statistically, there was only a weak and insignificant correlation between the DI and OGS (r = 0.055, p > 0.05). Buccolingual inclinations and interproximal contacts were components that had the highest and lowest mean OGS scores respectively. Conclusion: Malocclusion complexity was not associated with orthodontic treatment outcomes. Cases which underwent two-phase treatment were found to have the most complex pre-treatment malocclusion and also the most unsatisfactory clinical outcomes. The OGS component with the highest discrepancies was buccolingual inclinations.Mahidol UniversityDentistryArticleSCOPUS10.1016/j.odw.2019.10.003