[Study on the growth of the nose].

The purpose of this study was to determine the amount and direction of nasal growth, before or during orthodontic treatment. However, the growth of the nose as a separate entity in relation to classification of cranio-facial type has not been investigated by the lateral roentgenographic cephalogram until recently. In this study, I used 2782 traces of lateral roentgenographic cephalograms to study the growth of the Japanese nose. The traces were derived from a cross-sectional study of 1,233 growth of the Japanese nose. The traces were derived from a cross-sectional study of 1,233 males and 1,549 females over 5 years and 6 months old who had not undergone the orthodontic treatment yet. Various nasal parameters were measured to study the growth of 6 linear, 2 angular nasal parameters and 1 sectional area of the external nose. The early growth in females and late growth in males were the presence of an adolescent growth spurt and the height of the maxillary prognathic type on the nasal bone and the nasal tip were longer than that of the maxillary retrognathic type. Therefore, in orthodontic treatment, the growth of the cranio-facial type should be taken into consideration before the use of orthognathic force or orthognathic surgery.