We performed measurement using a 3-dimensional measurementsystem in study models of children with anterior crossbite in the primarydentition treated using a chin cap and lingual arch, and evaluated changes inthe dentition and occlusion after treatment based on measurement values andalso using wire frame models. Comparing with the situation before treatment,the overbite of anterior teeth shows improvement to become shallow and theterminal plane becomes vertical type and the occlusal plane becomes flatter.Labioclination of upper anterior teeth, linguoclination of lower anterior teethand backward movement of lower dentition are observed. Occlusal view showsthat both upper and lower dental arch become semicircular configuration. Thewidth, depth and height of the post-treatment dentition became closer to thestandard values. Chin cap and lingual arch treatment for anterior crossbiteduring early childhood is effective, and also helpful in the normal developmentof occlusion in children.