Skeletal III malocclusions may be due to mandibular prognathism or maxillary retrognathism or any combination of these features. It had been the impression that the maxilla was shorter in Class III cases with a high maxillary-mandibular planes angle and so a comparison was made between skeletal III cases with high maxillary-mandibular planes angle and a control group. The results showed a significant shortening in the Class III group.
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