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KMID : 0613420010100010008
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Journal of the Korean Academy of Esthetic Dentistry
2001 Volume.10 No. 1 p.8 ~ p.15
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Early Treatment of Class III Malocclusion
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Kim Ga-Yeong
Kim Jin-Yeong
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Abstract
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The Class III malocclusion classified in two types of Skeletal Class III and Pseudo Class III.
In the case of the maxillary deficiency, the protraction H-G(facemask) with Bonded RPE can be used.
For children with A-P and vertical maxillary deficiency, the preferred treatement is to move the maxilla into a more anterior and inferior position, which also increases its size as bone is added at the posterior and superior sutures. Successful forward repositioning of the maxilla can be accomplished before age 8.
To resist tooth movement as much as possible, the maxillary teeth should be splinted together as a single unit. The maxillary appliance must have hooks for attachment to the facemask that are located in the canine-primary molar area above the occlusal plane.
The facemask usually worn until a positive overjet of 2-5mm is achieved interincisally. Occipital chin cup is successful in those patients who can bring their incisors close to an edge-to-edge position when in centric relation. This treatment is particularly useful in patients who begin treatment with a short lower anterior facial height, as this type of treatment can lead to an increase in lower anterior facial height. If the pull of the chin cup is directed below the condyle, the force of the appliance may lead to a downward and backward rotation of the mandible.
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