| 摘要 |
A two-piece orthodontic appliance used in the treatment of Class III malocclusions. The appliance consists of a maxillary part and a mandibular part each fitted to the patient's teeth and having smooth surfaces that engage each other when in the patient's mouth. The maxillary part covers the palate and has a protruding guide on its inferior surface that extends distally toward the palate. The mandibular part has a groove corresponding to the guide on the upper part so that the two parts are slidably engaged when in place in the patient's mouth. Elastics are combined with the two parts of the appliance to create an antagonistic force between the two parts, which then simultaneously apply an anterior force to the maxilla and a posterior force to the mandible. The appliance thus applies forces that work against Class III development growth vectors to correct or minimize their effect on the patient.
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