A Morphological Study on the Dentition Using Fourier Analysis: The Relationship between Deciduous Dentition and Permanent Dentition Part II Comparison between Normal Occlusion and Malocclusion

Fourier analysis was used to compare the forms of the coronal and basal arches of the normal occlusion and the malocclusion. The materials consisted of 16 longitudinal stone casts of the normal occlusion and 8 longitudinal stone casts of the malocclusion. The follo w ing conclusions were obtained; 1. Upon Measuring the interdental space of deciduous dentition, the malocclusion was found to be smaller than the normal occulusion. 2. The coronal arches of the normal occulusion showed individual variations compared with the normal occlusion in the deciduous dentition. 3. No differences were observed in the size of the basal arches between the deciduous dentition and the permanent dentition of the malocclusion. 4. The sizes of the maxillary basal arches of the malocculusion was smaller than that of the normal occulusion in the deciduous dentition. 5. Definitive differences of shape were observed in the maxillary coronal arch, maxilary basal arch of the permanent dentition between the normal occulusion and the malocculusion.