Abstract: Objective To explore the new method of non-extraction treatment of anterior crossbite with severe crowding cases. Methods With the application of multi-purpose face bow in 12 cases with anterior crossbite and severe crowding,maxillary protraction and molar distalization were going on at the same time,so some clearance was provided in a short period of time for crowded teeth. Results Molar distalization was achieved and the anterior crossbite of 12 patients was corrected within a short period of time and some gaps between teeth were provided for crowded teeth,so the extraction treatment had been avoided. Conclusions The multi-purpose face bow is composed of face bow and maxillary protraction.The reverse reaction of maxillary protraction can lead to molar distalization.It can be used together with headgear.It can significantly improve the efficacy and shorten the course of treatment.The clinical application of this appliance can be effective in reducing cases of extraction treatment.

Key words: multi-purpose face bow, anterior crossbite occlusion, severe crowding, non-extraction treatment