Twin block group
TB
The present study showed a statistically significant increase in the three airways (NPAA, OPAA, LPAA) between T1 and T2 after the use of TB appliance. This was in agreement with the results of previous researches [From the present results, it was evident that the sagittal jaw relationship was significantly improved following TB treatment by increasing SNB and decreasing ANB and Wits appraisal. Similar results were obtained in earlier studies [Regarding the vertical dimension assessed by FMA angle in this study, it showed no difference before and after treatment either within each group or between both groups. These results were similar to those obtained by previous studies [