Robert Fishman教授的“中产阶级乌托邦”、“科技型新城”、“全球型郊区”三篇文章分别提出了中产阶级行为价值取向的研究视角、“郊区走向消亡,科技型新城的兴起”的观点、发展中国家全球型郊区的假设,使我们对郊区化有更加深刻的认...Robert Fishman教授的“中产阶级乌托邦”、“科技型新城”、“全球型郊区”三篇文章分别提出了中产阶级行为价值取向的研究视角、“郊区走向消亡,科技型新城的兴起”的观点、发展中国家全球型郊区的假设,使我们对郊区化有更加深刻的认识。郊区化对西方发达国家的城市产生过重要影响,本文希望通过对Robert Fishman的郊区化研究在纵向尺度上的述评研究,获得对未来中国郊区化与城市发展研究的一些有益借鉴与启发。展开更多
To investigate the longitudinal sagittal growth changes of maxilla and mandible according to the quantitative cervical vertebral maturation （QCVM） for adolescents with normal occlusion, mixed longitudinal data were ...To investigate the longitudinal sagittal growth changes of maxilla and mandible according to the quantitative cervical vertebral maturation （QCVM） for adolescents with normal occlusion, mixed longitudinal data were used. The samples included 87 adolescents aged from 8 to 18 y old with normal occlusion （32 males, 55 females） selected from 901 candidates. Sequential lateral cephalograms and hand-wrist films were taken once a year, lasting for 6 y. The longitudinal sagittal growth changes of maxilla and mandible according to QCVM were measured. There were some significant differences between maxilla and mandible according to QCVM. The sagittal growth change of maxilla showed a trend towards high velocity→decelerating velocity→completing velocity from QCVM stage Ⅰ to stage Ⅳ. The sagittal growth change of mandible showed a trend towards accelerating velocity→high velocity→decelerating velocity→completing velocity from QCVM stage Ⅰ to stage Ⅳ. With sagittal relationship, growth magnitude was almost the same between maxilla and mandible at QCVM stage Ⅰ . At stage Ⅱ the growth of mandible exceeded that of maxilla and growth in mandible continued at stages Ⅲ and IV, while the maxilla ceased to grow. Growth magnitude was greater and the growth duration was longer with male mandible. It is concluded that the longitudinal sagittal growth changes of maxilla and mandible on the basis of QCVM is of value in the orthodontic practice.展开更多
基金supported by a grant from the National Natural Sciences Foundation of China (No.30801314)
文摘To investigate the longitudinal sagittal growth changes of maxilla and mandible according to the quantitative cervical vertebral maturation （QCVM） for adolescents with normal occlusion, mixed longitudinal data were used. The samples included 87 adolescents aged from 8 to 18 y old with normal occlusion （32 males, 55 females） selected from 901 candidates. Sequential lateral cephalograms and hand-wrist films were taken once a year, lasting for 6 y. The longitudinal sagittal growth changes of maxilla and mandible according to QCVM were measured. There were some significant differences between maxilla and mandible according to QCVM. The sagittal growth change of maxilla showed a trend towards high velocity→decelerating velocity→completing velocity from QCVM stage Ⅰ to stage Ⅳ. The sagittal growth change of mandible showed a trend towards accelerating velocity→high velocity→decelerating velocity→completing velocity from QCVM stage Ⅰ to stage Ⅳ. With sagittal relationship, growth magnitude was almost the same between maxilla and mandible at QCVM stage Ⅰ . At stage Ⅱ the growth of mandible exceeded that of maxilla and growth in mandible continued at stages Ⅲ and IV, while the maxilla ceased to grow. Growth magnitude was greater and the growth duration was longer with male mandible. It is concluded that the longitudinal sagittal growth changes of maxilla and mandible on the basis of QCVM is of value in the orthodontic practice.
