Abstract: 【Abstract】 Objective To evaluate the clinical result of treating buccal crossbite of posterior teeth by modified occlusion splint combine with masticatory training．Methods 20 buccal crossbite cases with linguilly inclined lower posterior teeth and buccally inclined upper posterior teeth were treated with occlusion splint and postoperative masticatory training.Clinical result was observed and changes of FH-MP,U6-PP,L6-MP on cephalometric analysis were measured before and after treatment. Results The malocclusion of all 20 cases was relieved with no change of FH-MP,U6-PP,L6-MP . Conclusions Modified occlusion splint combine with masticatory training could be a effective method to treat buccal crossbite with good control of crossbite teeth vertically.

Key words: 【Key words】Modified Occlusion Splint, Masticatory Training, Buccal crossbite of posterior teeth