A Study on the Interrelation of Growth Changes of Upper Apical Base and Alignment of Permanent Upper Anterior Teeth.

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  • Funayama Kenji
    Department of Pediatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University

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  • 上顎歯槽基底の成長変化と永久前歯の配列状態との相互関係に関する研究

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A comparative study was made between the crowding group and the normal aligned group to clarify the relationship between the growth of the maxilla, occlusion and the alignment of teeth. The material consisted of longitudinal dental casts and lateral cephalograms (II A, III A, III C of Hellman's dental age) taken from each of the 10 children. Differences between the two groups were investigated concerning the size of teeth, dental arches and the coordinates of the landmarks. Then a factor analysis on the growth change, which the coordinates of landmarks showed, was performed.<BR>The results were as follows<BR>1. The differences of both the tooth size and the coordinates of the landmarks on the cephalograms were not significant.<BR>2. From the factor analysis, it was observed that in the crowding group the migrations of the upper anterior teeth and molars were related more closely to the cranial base, the palate and the apical base, and also the dental arch migrated in unity.<BR>3. It was suggested from the above results that although, in the normal group, the anterior teeth and molars migrated independently, stringently controlled migration of the teeth in the crowding group caused the united migration of the arch, resulting in uncompensatory accommodation of the teeth.

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