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The European Journal of Orthodontics 1998 20(1):17-23; doi:10.1093/ejo/20.1.17
© 1998 by European Orthodontic Society
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Dental changes in the mandible during initial Bass appliance therapy

J Ömblus and O Malmgren

Department of Orthodontics, Eastman Institutet, Stockholm and Department of Orthodontics and Pediatric Dentistry, School of Dentistry, Karolinska Institutet, Huddinge, Sweden

The aim of this study was to analyse movements of lower molars and incisors during 6 months of Bass appliance therapy and to evaluate the dental arch space attained. The sample consisted of 53 patients with severe Class II, division 1 malocclusions. The analyses were performed on lateral cephalograms and dental casts. Sixteen of the patients were followed for 6 months before treatment. Dental space in the lower jaw decreased 0.7 mm (n = 16) during the observation period and increased 1.8 mm (n = 53) during the 6 months of treatment. The molars moved posteriorly a total of 0.7 mm and tipped distally 2.4 degrees during treatment. The incisors moved anteriorly 0.3 mm and tipped mesially 0.5 degrees.


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