얼굴의 수직성장을 이용하여 Ⅲ급 부정교합을 치료하는 구강내 가철식 장치의 치료기간분석

Abstract

Vertical facial growth triggers the rotation of mandible to move the chin point to the downward and backward direction, which showed remarkably effective result making the less prominent chin. Recently, the intraoral removable appliance utilizing class Ⅲ elastic demonstrated the vertical growth trigger mechanism. The treatment change was very fast and wearing was quite easy, compared to extraoral appliances.

The purpose of this study was to verify the duration of the treatment on class Ⅲ malocclusion using intraoral removable appliances, which designed to accelerate vertical facial growth.

56 patients were selected with the complaint of the protruded mandible and class Ⅲ malocclusion (overjet : -3 - 0 mm, overbite : 0 - 4 mm). Information like; age at start, duration of the treatment events, type of the treatment, overjet, overbite etc. was collected and calculated.

The average age of the patients delivering the initial brace was 8.75 ± 1.10 year. Most of the anterior crossbite was resolved within 6 months. The total treatment period was 21.79 ± 10.73 months with the additional procedures like the alignment of anterior teeth and torque control using additional removable and fixed orthodontic appliances. The correlation study showed that patient’s cooperation (p = 0.000) and the use of fixed appliance (p = 0.032) were significantly influenced on treatment duration.