Conclusion
malocclusion
ERUPTION
The timing of CHG treatment influences dental arch changes in the long term. Both genders benefit from earlier CHG treatment, males even more than females, especially in the short term. The maxillary dental arches remained longer, and the final width was gained earlier in EG compared with LG. Although mandibular dental arch length and width increased during late mixed dentition in EG compared with LG, the long-term length changes in mandible dental arch were gender related. The results showed that in terms of total mandibular arch length increases, EG males seem to benefit more and LG females less from CHG treatment.Thus, these findings support our hypothesis that CHG timing affects dental arch dimensions and the stability of the outcome in long-term follow-up. However, if early treatment is considered, there seem to be some benefits in starting the treatment right after the eruption of the first maxillary molars in CII malocclusion.