Skip Navigation

The European Journal of Orthodontics 1987 9(1):305-313; doi:10.1093/ejo/9.1.305
© 1987 by European Orthodontic Society
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Hamano, Y.
Right arrow Articles by Ahlgren, J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Hamano, Y.
Right arrow Articles by Ahlgren, J.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

A cephalometric study of the construction bite of the activator

Yoshihiko Hamano*, and Johan Ahlgren{dagger}

*Kyushu University Fukuoka, Japan
{dagger}University of Lund Malmö, Sweden

Professor Johan Ahlgrcn Department of Orthodontics Faculty of Odontology University of Lund S-214 21 Malmö, Sweden

The dimensions of the construction bite of the activator, as well as the positional changes of the mandible and hyoid bone, were studied on cephalometric radiographs in 30 subjects with Angle Class II, division 1 malocclusion. The cephalometric radiographs were taken at the start of treatment of each child, one with the mandible in the intercuspal position and one with the activator in the mouth. The activator patients were divided into two groups because of differences in the construction of the wax bite. In group 1 the wax bite separated the upper and lower incisors by 1—3 mm, while in group 2 the incisors were in an edge-to-edge position.

It was shown that in the incisor region the mean opening of the bite for groups 1 and 2 was 5.9 and 4.8 mm, respectively. A slight posterior rotation of the mandible (mean 2 degrees) was recorded. On average the pogonion point of the mandible moved downward and forward 5.3 and 3.7 mm, respectively, while the corresponding values for the hyoid bone were 1.0 and 1.8 mm, respectively. The condyle was displaced downward and forward 2.5 and 4.6 mm, respectively. A significantly larger sagittal displacement of the mandible (pogonion and condyle) was recorded in group 2 cases.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.