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[Modified retention elements of removable reverse headgear appliances].

Hui Zhang¹, Jun Liu, Xiao-Feng Fan

¹Department of Orthodontics, The Third Affiliated Hospital of Neimenggu Medical College, Baotou 014010, China.

Hua Xi Kou Qiang Yi Xue Za Zhi = Huaxi Kouqiang Yixue Zazhi = West China Journal of Stomatology

|August 19, 2008

Summary

Adding an Adams clasp to reverse headgear appliances significantly improves retention and reduces dislocation. This modification enhances treatment effectiveness for skeletal Class III malocclusion.

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Area of Science:

Orthodontics
Dental Materials Science

Background:

Skeletal Class III malocclusion requires effective orthodontic treatment.
Removable reverse headgear appliances are used, but retention can be an issue.

Purpose of the Study:

To evaluate the effectiveness of modified retention elements in reverse headgear appliances.
To improve treatment outcomes for skeletal Class III malocclusion.

Main Methods:

Eighteen patients with skeletal Class III malocclusion were divided into two groups: traditional (T) and modified (M) retention elements.
The modified appliance included an Adams clasp on the central incisors.
Minimum dislocating force and dislocation occurrence were measured over three months.

Main Results:

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The modified (M) group demonstrated significantly superior retention compared to the traditional (T) group.
Minimum dislocating force was notably higher in the M group (P<0.01, P<0.001).
Dislocations occurred less frequently in the M group (2 vs. 9 times, P<0.05).

Conclusions:

Incorporating an Adams clasp effectively prevents downward appliance dislocation during traction.
This modification substantially enhances the therapeutic efficacy of reverse headgear appliances.