Inuzuka K
Department of Pediatric Dentistry, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Aichi Gakuin Daigaku Shigakkai Shi. 1990 Sep;28(3):829-56.
In order to analyze individual growth, 10 cases which contained longitudinal data and materials were chosen out of the 32 cases with bilateral distal step that were used in the study of Part I. The control group comprised the same twelve cases that were used in Part I. Observations of plaster models were made on the eruption age and eruption sequence of the first maxillary and mandibular permanent molars and incisors, the mesiodistal crown diameter, the interdental spaces in the primary dentition, and individual growth of the maxillary intercanine width. Cephalometric analysis was made on linear and angular items in which a significant difference between the two groups was found in the study Part I: Growth on the Average. Growth patterns were classified according to profilograms. The relationship between the terminal planes and analyzed items was also discussed. The results were as follows: 1. Individual growth data obtained from plaster models 1) Concerning the eruption age of the permanent teeth, the first maxillary molars of the examined group erupted in 5.84 years on the average. In cases of the control group, 6.42 years was the average. There was a significant difference between the two groups. The maxillary and mandibular central incisors of the examined group tended to erupt slightly earlier than the control group. 2) Concerning the eruption sequence of the permanent teeth, the first maxillary molars or the mandibular central incisors erupted earliest in the examined group, and the first mandibular molars or the mandibular central incisors in the control group. 2. Individual growth data obtained from cephalometrics 1) Concerning skeletal patterns, the examined group showed a significantly larger increase of the lower facial height (NF-Me) than the control group in the period from eruption of the first molars to eruption of the maxillary central incisors. In this period, 8 out of 10 cases of the examined group and 3 out of 12 cases of the control group showed the maximal growth change. 2) Concerning denture patterns, the maxillary incisor height (Ul-NF) increased markedly in the period from eruption of the first molars to eruption of the maxillary central incisors. This was found in 8 cases of the examined group and 4 cases of the control group.(ABSTRACT TRUNCATED AT 400 WORDS)
为了分析个体生长情况，从用于第一部分研究的32例双侧远中阶梯病例中选取了10例包含纵向数据和资料的病例。对照组由与第一部分相同的12例病例组成。对石膏模型进行观察，内容包括上颌和下颌第一恒磨牙及切牙的萌出年龄和萌出顺序、牙冠近远中直径、乳牙列中的牙间隙以及上颌尖牙间宽度的个体生长情况。对第一部分研究中发现两组间存在显著差异的线性和角度项目进行了头影测量分析：平均生长情况。根据侧貌图对生长模式进行分类。还讨论了终末平面与分析项目之间的关系。结果如下：1. 从石膏模型获得的个体生长数据 1）关于恒牙萌出年龄，受检组上颌第一磨牙平均萌出时间为5.84岁。对照组平均为6.42岁。两组间存在显著差异。受检组上颌和下颌中切牙的萌出时间往往比对照组略早。2）关于恒牙萌出顺序，受检组最早萌出的是上颌第一磨牙或下颌中切牙，而对照组最早萌出的是下颌第一磨牙或下颌中切牙。2. 从头影测量获得的个体生长数据 1）关于骨骼模式，在第一磨牙萌出至上颌中切牙萌出期间，受检组的面下高度（NF-Me）增加幅度显著大于对照组。在此期间，受检组10例中有8例、对照组12例中有3例出现最大生长变化。2）关于牙列模式，在第一磨牙萌出至上颌中切牙萌出期间，上颌切牙高度（Ul-NF）显著增加。受检组8例、对照组4例出现这种情况。（摘要截选至400字）
