Evaluation of modified clear Twin Block aligner in treating adolescents with skeletal class II malocclusion: A two‐centre cephalometric study

Introduction The purpose of this study was to evaluate the therapeutic effect of modified clear Twin Block (CTB) aligner and traditional twin block (TB) appliance from skeletal, dentoalveolar and soft tissue changes in adolescents with skeletal class II malocclusion. Methods A total of 80 adolescents, included in this study from two medical centres, were distributed into CTB group, TB group and control group based on the treatment they received. Lateral cephalograms at pre‐treatment (T1) and post‐treatment (T2) were measured by modified Pancherz's cephalometric analysis, and dentoskeletal and soft tissue changes were analysed by independent‐sample t‐test, paired‐sample t‐test, ANOVA test and Scheffe's Post Hoc test. Results Seventy‐five adolescents completed the study, including 32 in the CTB group, 32 in the TB group and 11 in the control group. Both CTB and TB treatment showed significant differences in most dentoskeletal and soft tissue measurements. Compared with the control group, improvements were observed in class II molar relationship through significant different in S Vert/Ms‐S Vert/Mi in the CTB group (P