Kieser J A, Groeneveld H T, Preston C B
Am J Phys Anthropol. 1985 Jan;66(1):21-9. doi: 10.1002/ajpa.1330660103.
Wear patterns were examined on dental casts of 202 living Lengua Indians from the Chaco area of Paraguay. Consideration was given to the development of the molar helicoidal plane, age-related changes in occlusal attrition, coalescence of dentine exposures, interproximal attrition, and erupted crown height. This study lends support to Osborn's theory of the helicoidal plane development by showing that attrition enhances rather than modifies posteruption molar occlusal planes. The rate of interproximal attrition was found to slow down with the eruption and functional initiation of the third molars. Sinuous and cavo-convex interproximal contact areas that are generated with age, however, appeared to be less abrasion resistant than straight surfaces, hence leading to an increase in interproximal attrition rates with advanced age. Maximum crown height reduction occurred between the ages of 20 and 40 years in central incisors, canines, and first molars. Kruskal-Wallis tests and log linera models failed to demonstrate significant sexually dimorphic or antimeric differences in wear patterns of Lengua teeth.
对来自巴拉圭查科地区的202名在世的伦瓜印第安人的牙模上的磨损模式进行了检查。研究考虑了磨牙螺旋平面的发育、咬合磨损的年龄相关变化、牙本质暴露的融合、邻面磨损以及萌出冠高度。这项研究通过表明磨损增强而非改变萌出后磨牙咬合平面，支持了奥斯本关于螺旋平面发育的理论。发现随着第三磨牙的萌出和功能启动，邻面磨损速率减缓。然而，随着年龄增长产生的蜿蜒状和腔凸状邻面接触区域似乎比直面更不耐磨损，因此导致高龄时邻面磨损率增加。中切牙、尖牙和第一磨牙在20至40岁之间出现最大冠高度降低。克鲁斯卡尔 - 沃利斯检验和对数线性模型未能证明伦瓜人牙齿磨损模式存在显著的性别差异或左右差异。
