Comparison of Activator-Headgear and Twin Block Treatment Approaches in Class II Division 1 Malocclusion

• Published in: BioMed research international Vol. 2017; pp. 1 - 9
• Main Authors: Spalj, Stjepan, Mroz Tranesen, Kate, Birkeland, Kari, Katic, Visnja, Pavlic, Andrej, Vandevska-Radunovic, Vaska
• Format: Journal Article
• Language: English
• Published: United States Hindawi 01.01.2017; John Wiley & Sons, Inc; Hindawi Publishing Corporation
• Subjects: Adolescent; Biomedical research; Cephalometry; Child; Comparative analysis; Discriminant analysis; Drug therapy; Extraoral Traction Appliances; Face - pathology; Female; Humans; Incisor - growth & development; Incisor - pathology; Male; Malocclusion; Malocclusion, Angle Class II - pathology; Malocclusion, Angle Class II - therapy; Mandible - growth & development; Mandible - pathology; Maxilla - growth & development; Maxilla - pathology; Orthodontics; Studies; Treatment Outcome
• ISSN: 2314-6133; 2314-6141; 2314-6141
• DOI: 10.1155/2017/4861924

The purpose was to compare the treatment effects of functional appliances activator-headgear (AH) and Twin Block (TB) on skeletal, dental, and soft-tissue structures in class II division 1 malocclusion with normal growth changes in untreated subjects. The sample included 50 subjects (56% females) aged 8–13 years with class II division 1 malocclusion treated with either AH (n=25) or TB (n=25) appliances. Pre- and posttreatment lateral cephalograms were evaluated and compared to 50 untreated class II division 1 cases matched by age, gender, ANB angle, and skeletal maturity. A paired sample, independent samples tests and discriminant analysis were performed for intra- and intergroup analysis. Treatment with both appliances resulted in significant reduction of skeletal and soft-tissue facial convexity, the overjet, and the prominence of the upper lip in comparison to untreated individuals (p<0.001). Retroclination of maxillary incisors and proclination of mandibular incisors were seen, the latter being significantly more evident in the TB group (p<0.05). Increase of effective mandibular length was more pronounced in the TB group. In conclusion, both AH and TB appliances contributed successfully to the correction of class II division 1 malocclusion when compared to the untreated subjects with predominantly dentoalveolar changes.