Developed face bow and protraction headgear in correction of anterior openbite Class III patients

Abstract

The aim of this face bow and protraction headgear design is to correct the anterior open bite in dentally Class III open bite cases. Patients were selected and full coverage acrylic cap splint-type rapid maxillary expansion appliance was cemented and activated twice a day for 5 days. After sutural separation, newly developed face bow and protraction headgear was worn and 750 g of force was applied. Newly developed appliance consisted of a face bow and forehead pad. The face bow had intraoral and extraoral components and was custom made individually for each patient. The intraoral bow was inserted from the distal openings of the tubes which was soldered to the extraoral face bow. The extraoral face bow was extended backward till the front of the ear then turned upward and ended at the level of the hooks on the forehead pad. In this extraoral appliance design only the forehead was used as anchorage unit. On both sides of the pad, adjustable wire hooks were placed which allowed us to maintain the distance from the forehead pad hooks to the face bow hooks. Heavy elastics were attached in between the hooks of the face bow and the hooks on the forehead pad.

Description

BACKGROUND OF THE INVENTION [0001] Treatment of a malocclusion characterized by open bite with Class III pattern can be difficult to treat since such a malocclusion develops as a result of the interplay of many different etiological factors. Skeletal open bite cases are usually characterized by an increase in the vertical growth of the maxillary posterior dentoalveolar segments. The application of conventional reverse headgears and application of the mesially directed force below the center of resistance of maxillary dentition would tend to increase the anterior open bite. An intrusion of posterior teeth becomes more difficult with older age, mechanical treatment options are limited in adult patients. Orthognathic surgery is indicated in adult patients with severe open bite and Class III skeletal pattern with retrognthic maxilla. For the treatment of borderline cases, and those individuals who are reluctant to surgery, the search for a new treatment modalities continues. [0002] Prev...

AI Technical Summary

Problems solved by technology

Treatment of a malocclusion characterized by open bite with Class III pattern can be difficult to treat since such a malocclusion develops as a result of the interplay of many different etiological factors.

An intrusion of posterior teeth becomes more difficult with older age, mechanical treatment options are limited in adult patients.

Until today most of the appliances which were developed could not prevent the upward and forward rotation of the maxilla.

It is impossible to stabilize the force system in reverse pull headgear, which takes anchorage from the chin, since the movement of the mandible doesn't allow us to apply a consistent force.

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