Dental changes in the mandible during initial Bass appliance therapy.
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 and tipped distally 2.4 degrees during treatment. The incisors moved anteriorly 0.3 mm and tipped mesially 0.5 degree.
Omblus
J
J
Department of Orthodontics, Eastman Institutet, Stockholm, Sweden.
Malmgren
O
O
D000202:Activator Appliances; D002508:Cephalometry; D002648:Child; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008334:Mandible / Q000254:growth & development / Q000503:physiopathology; D003765:Models, Dental; D008963:Molar; D010043:Outcome and Process Assessment, Health Care; D063173:Retrognathia / Q000628:therapy; D013027:Space Maintenance, Orthodontic; D014087:Tooth Movement Techniques / Q000379:methods*