This study was undertaken to establish the antero-posterior and vertical position of the craniofacial structures in Class Ⅲmalocclusion. For the purpose of the study, 125 normal samples(61 male, 64 female) and 168 ClassⅢsamples(70 male, 98
female)
were selected and the cephalometric radiographs were taken and analyzed by method of mesh diagram.
@ES The following results were obtained:
@EN 1. The antero-posterior position of maxilla and mandible showed the highest prevalence in the group of posterior position of the maxilla(57.74%), and in the group of anterior postion of the mandible(79.17%).
2. The combination of maxillary and mandibular antero-posterior position showed the highest prevalence in the group of maxillary posterior position and mandibular anterior position(38.69%) and maxillary position and mandibular anterior
position(26.78%), maxillary and mandibular anterior position(13.69%), maxillary and mandibular posterior position(10. 11%) in sequence.
3. The vertical position of maxilla and mandible showed the highest prevalence in the group of superior position of the maxilla (43.45%), and in the group of inferior position of the mandible(45.83%).
4. The combination of maxillary and mandibular vertical position showed the highest prevalence in the group of maxillary and mandibular superior position(35.11%) and mandibular anterior position(38.69%) and maxillary and mandibular inferior
position(21.42%), maxillary normal position and mandibular inferior position(18.45%), maxillary and mandibular normal position(11.30%) in sequence.
5. The inclination of maxillary and mandibular anterior teeth showed the showed the highest prevalence in the group of labial inclination of the maxillary anterior teeth(46.71%), and in the group of lingual inclination of the mandibular anterior
teeth(67.85%)
6. The antero-posterior and vertical structural combination of maxilla and mandible showed the highest prevalence in the group of maxillary posterior position, mandibular anterior position and maxillary superior and mandibular superior
position(14.29%)
(Table 10)
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