J. Orthod.
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Journal of Orthodontics, Vol. 30, No. 3, 197-201, September 2003
© 2003 British Orthodontic Society

Clinical Section

Class III Twin Blocks: a case series

G. Kidner, A. DiBiase and D. DiBiase

1 Stoke Mandeville Hospital, Buckinghamshire, and John Radcliffe Hospital, Oxford, UK
2 Canterbury Hospital, Kent, UK
3 Southend Hospital, Essex, UK

Giles Kidner, Orthodontic Department, Stoke Mandeville Hospital, Mandeville Road, Aylesbury, Bucks HP21 8AL, UK. E mail: Giles.Kidner{at}smh.nhs.uk

Abstract

Objective: To evaluate the use of Class III Twin Blocks for the early treatment of Class III malocclusion.

Design: Retrospective analysis.

Subjects and Method: 14 subjects were consecutively treated with a modified version of the Class III Twin Block appliance. Lateral cephalometric radiographs taken at the start and end of treatment were assessed digitally.

Results: The mean age of subjects was 10 years and mean treatment time was 6.6 months. The cephalometric analysis of changes during treatment shows proclination of the upper incisors [mean 5.1°, SD 5.1], retroclination of the lower incisors [mean -4.5°, SD 3.9], reduction in angle SNB [mean -1.3°, SD 1.8] and an increase in the maxillary/ mandibular planes angle (mean 2.1°, SD 2.2]. Average cephalometric digitizations and photographs of a clinical case are shown.

Conclusions: Class III Twin Blocks can be used successfully for early treatment of Class III malocclusion. A randomly allocated prospective study is required to fully evaluate the efficacy of this appliance.

Key words: Class III, Twin Blocks, Function Regulator III






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