Shape components of the maxillary molars in Australian aboriginals.
Shape components of the maxillary molars in Australian aboriginals.
复制标题
澳大利亚原住民上颌磨牙的形状组成。
DOI：
10.1002/ajpa.1330820306
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发表时间：
1990
影响因子：
2.8
通讯作者：
T. Brown
中科院分区：
文献类型：
--
作者：
H. Yamada;T. Brown
主成分分析被用来量化的变化，在冠轮廓的上颌磨牙在澳大利亚原住民。从中央窝到冠部周边的36个半径测量轮廓。第一个组成部分，负责超过一半的总方差，与一般冠的大小。其余四个组成部分被保留，以表明不同牙冠组成部分的发育或减少程度不同所导致的变异性来源。从第一至第三磨牙的形状变化与代表整体尺寸减小、下锥减小、后锥元素和近远中压缩的组成部分相一致。前后梯度沿着磨牙系列的平均分数和方差的所有组成部分的逐步减少的远端冠元素，增加近远中的压力，更大的形态变化。
Principal components analysis was used to quantify the variability in crown outlines of maxillary molars in Australian Aboriginals. The outlines were measured by 36 radii from the central pit to the crown periphery. The first component, responsible for over half of the total variance, was concerned with general crown size. Four remaining components were retained to indicate sources of variability resulting from contrasting degrees of development or reduction of different crown components. Shape changes from the first to third molars were identified with components representing overall size reduction, diminution of the hypocone, and metacone elements and mesiodistal compression. An anteroposterior gradient along the molar series in average scores and variances for all components resulted from the progressive reduction of distal crown elements, increasing mesiodistal compression, and greater morphological variation.