American Journal of Orthodontics and Dentofacial Orthopedics
Original ArticleGrowth and treatment changes in patients treated with a headgear-activator appliance*,**,*,**
Section snippets
Material and methods
The primary sample comprised 20 consecutive white male patients with skeletal Class II malocclusion and increased overjet who were treated with the headgear-activator appliance devised by van Beek.15, 16 The selection criteria were mixed dentition, fair shape of the dental arches, mild-to-moderate skeletal Class II (ANB 4.5° ≤ 8°), mandibular plane angle (NSL/ML > 39.0°), no previous orthodontic treatment, and acceptable cooperation (evaluated after 2 months). The initial average overjet and
Results
Table IV shows the changes due to growth during the 12-month treatment period (T1-T3). Both overjet (not significant [NS]) and molar relationship (P <.05) improved. The maxilla grew forward by 1.3 mm (P <.05) and the mandible by 2.2 mm (P <.01), resulting in a significant improvement of the jaw-base relationship (P <.05). The dental changes, with the exception of uprighting the mandibular incisors by 0.7 mm (P <.05), were insignificant. Mandibular length increased by 2.5 mm (P <.001). The
Discussion
In the present study, consecutive young males with skeletal Class II malocclusions were treated with a simple headgear-activator removable appliance15, 16 by 1 operator (M.B.). The compliance rate (85%) was near that of earlier studies for similar appliances.18, 23 The cephalometric characteristics of our sample were similar to a reference sample of Class II Division 1 subjects,21, 22 except for a tendency for larger lower facial height in our sample (Table III). The study included only
Conclusions
It was concluded that:
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On average, there were small, favorable, normal, skeletal growth changes in subjects with Class II Division 1 malocclusion.
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The skeletal effect of the headgear-activator appliance was primarily limited to restraint of forward maxillary growth.
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There was a modest enhancement of mandibular growth during the initial phase of treatment only.
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The vertical dental effect of the headgear-activator appliance was to restrain the eruption of the maxillary molars and incisors; the
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Cited by (46)
Cephalometric effects of Twin-block and van Beek Headgear-Activator in the correction of Class II malocclusion
2023, American Journal of Orthodontics and Dentofacial OrthopedicsOverjet reduction in relation to wear time with the van Beek activator combined with a microsensor
2017, American Journal of Orthodontics and Dentofacial OrthopedicsUltrasound Applications in Orthodontics
2015, Stem Cell Biology and Tissue Engineering in Dental SciencesDentoskeletal changes induced by the Jasper jumper and the activator-headgear combination appliances followed by fixed orthodontic treatment
2013, American Journal of Orthodontics and Dentofacial OrthopedicsCitation Excerpt :When comparing the 3 groups regarding treatment and growth changes, there was a similar restriction of maxillary forward displacement in both experimental groups (Table VII). These results agree with previous studies that also found significant restrictions of maxillary growth during Jasper jumper35-39 and activator-headgear combination therapies.21,28,40-43 Since these 2 modalities of orthopedic appliances were used to stimulate and redirect mandibular growth, when we compared changes in the mandibular components (SNB and Co-Gn), there were no significant differences between the experimental groups and the control group (Table VII).
Orthopedic effects of splint high-pull headgear-A cephalometric appraisal
2010, Orthodontic Waves
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aAssistant professor.
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bChair professor.
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cAssociate professor.
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Reprint requests to: Dr Margareta Bendeus, Orthodontics, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Hong Kong, SAR China; e-mail, [email protected].