Conclusion vertical control was good in jaw bone and was not effective in dentition when applying maxillary protraction combined with rapid expansion.
结论联合上颌前方牵引及快速扩大方法对颌骨垂直向控制较好，但对牙齿垂直向控制较差。
2
Objective To investigate the changes of hard tissue changes in vertical dimension when applying maxillary protraction combined with rapid maxillaryexpansion.
目的研究联合应用上颌前方牵引及快速扩大对硬组织垂直向的作用。
3
Rapid maxillaryexpansion is a method which is often being used to treat the transverse discrepancy of widths of maxilla.