Journal Article

Functional regulator treatment of Class II division 1 malocclusions

S. M. Chadwick, J. C. Aird, P. J. S. Taylor and D. R. Bearn

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 23, issue 5, pages 495-505
Published in print October 2001 | ISSN: 0141-5387
Published online October 2001 | e-ISSN: 1460-2210 | DOI:
Functional regulator treatment of Class II division 1 malocclusions

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This controlled retrospective study aimed to identify the contribution of skeletal and dental changes in the correction of Class II division 1 malocclusions using Fränkel's functional regulator II (FRII), with reference to a concurrently recruited control group. One hundred and thirty‐eight patients with Class II division 1 malocclusions were identified, those accepting treatment forming the study group and those declining treatment the control group. The study group (n = 70) were treated with a Fränkel appliance. Pre‐ and post‐treatment observation cephalometric radiographs were analysed and compared. Mean values for both skeletal and dental variables in the control group were remarkably consistent throughout the study period; however, this masked individual variations in this group.

The skeletal variables in the study group that showed statistically significant differences from the control group were SNB, ANB, BaNA and ANS‐Me, but none of these was sufficiently large to be regarded as clinically significant. Dental variables showed clinically and statistically significant differences, including a 10 degree reduction in UI‐Max and 3.1 degree increase in LI‐Mand. The Fränkel appliance was thus found to be effective in producing desirable occlusal and dental changes in the majority of patients treated.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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