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Construction of the average planes. The occlusal plane (OP) was modelized by computer using the landmarks located on the buccal cusps of the deciduous and/or permanent molars, premolars, canines and the inter-incisor point. The foramen condyle plane (FCP) was calculated by computer using the condyle landmarks and the mandibular foramen. The sagittal plane (SP) referred to landmarks located in the maxilla and the cranial base
