Abstract
The purpose of this study was to understand the relationship between the morphologic patterns of the skeletal profiles of patients with anterior cross-bite in the primary dentition and the cranial base angle (NS-Ba). The patients consisted of 74 males and 65 females whose ages ranged from 2 to 7years. Lateral roentgenographic cephalograms of all of the patients were taken before treatment at the Pedodontic Clinic, Niigata University Dental Hospital, and were used for the analysis in this study. The following results were obtained; 1) Anterior cross-bite in the primary dentition seemed to be characterized primarily by maxillary retrusion when compared with the Japanese standards in the lower age group. In contrast, in the higher age group, it may be characterized by mandibular protrusion.2) Skeletal profiles of the patients ranged widely, and profiles of the children with normal occlusion in the primary dentition showed the same tendency.3) When the patients were classified into three groups according to their Cranial base angle (large group, moderate group and small group), regarding their mean profiles, it was suggested that the mesiodistal angle of the facial line from cranial base related to their mean cranial base angle.4) Multivariate analysis proved that there was almost no relationship between cranial base angle and relative position of the maxilla and the mandible. There was also almost no relationship between the cranial base angle and the age of the patients.
