[Principles of ontogenetic (phenotype and genotype) variability of the maxillo-dental system].

L T Levchenko
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Abstract

By means of the computer a multiple regrouping of 1090 caucasians and 1035 Mongoloids at the age of 17-21 years and 98 (corpses) caucasian ++ men at the age of 17-38 years has been performed with a subsequent inter- and ++intra-grouping analysis of 27 variants of the structure of the maxillodental system separately for the lower and upper jaws. A certain regularity between enlargement of the teeth size, increasing angle of the lower jaw and decreasing size of the longitudinal and expressive dimensions of the jaws (in accordance with decreasing size of the spongy substance and its cells) has been revealed. It is accompanied with increasing caries and vice versa within all the groups studied. There are certain borders for individual variants in every group (race, sex, wide-, middle- and ++steno-osseous). The morphotypes of the maxillo-dental system revealed are constitutional. They are marker for ontogenic rates and help to explain peculiarities++ of its individual specific reactions to caries liability.

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[上颌-牙齿系统个体发生(表型和基因型)变异的原理]。
通过计算机对年龄在17-21岁的1090名白种人和1035名蒙古人种以及年龄在17-38岁的98名(尸体)白种人++男性进行了多次重组,随后分别对上颌和下颚的27种不同的上颌系统结构进行了分组间和分组内分析。牙齿尺寸的增大、下颌角度的增大与颌骨纵向尺寸和表现尺寸的减小(与海绵状物质及其细胞的减小一致)之间存在一定的规律性。在所有被研究的人群中,它都伴随着龋齿的增加,反之亦然。每个群体(种族、性别、宽骨、中骨和窄骨)的个体变异都有一定的边界。上颌-牙齿系统的形态显示为结构型。它们是个体发生率的标志,并有助于解释其对龋齿责任的个体特定反应的特殊性。
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