Journal Article

Dental changes in the mandible during initial Bass appliance therapy

J Ömblus and O Malmgren

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 20, issue 1, pages 17-23
Published in print February 1998 | ISSN: 0141-5387
Published online February 1998 | e-ISSN: 1460-2210 | DOI:
Dental changes in the mandible during initial Bass appliance therapy

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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.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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