Sign-oriented Dirichlet Normal Energy: Aligning Dental Topography and Dental Function in the R-package molaR
Sign-oriented Dirichlet Normal Energy: Aligning Dental Topography and Dental Function in the R-package molaR
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面向符号的狄利克雷正态能量：在 R 包 molaR 中对齐牙齿地形和牙齿功能
DOI：
10.1007/s10914-022-09616-6
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发表时间：
2022
影响因子：
1.9
通讯作者：
Kay, Richard F.
中科院分区：
文献类型：
--
作者：
Pampush, James D.;Morse, Paul E.;Fuselier, Edward J.;Skinner, Matthew M.;Kay, Richard F.
狄利克雷法向能量（DNE）是一种旨在捕获咬合锐度的牙齿地形测量，并已显示出其根据感知剪切能力对灵长类磨牙进行分类的能力。如最初实施的，该测量不区分对表面锐度的凹贡献与凸贡献。这是有问题的，因为从咬合面的凹面获得的DNE信号测量到向内朝向釉质牙本质接合处而不是向外朝向食物接触的尖锐“边缘”。在饮食分析中包含的凹DNE磨牙具有深咬合沟，如那些发现在原始人膨胀，这些牙齿的感知功能的锋利度。凹陷膨胀的DNE值可能会产生误导，被解释为表明一个特定的分类群更适合于加工纤维食物，而不是保证。这里介绍的DNE测量的修改“符号导向DNE”通过消除分析中的凹锐度来解决这个问题，允许调查集中在咬合表面的特征上，这些特征与咀嚼动力冲程的第一阶段和第二阶段期间食物材料的剪切、切割或切碎密切相关。凸DNE是一样有效的分类非类人猿灵长类动物磨牙到传统的饮食类别的测量方向盲版本的初始应用程序，并产生更多的理论上一致的结果从类人猿磨牙。关注并改善测量和咬合功能之间的联系将增强牙齿地形图的能力，为我们对物种饮食生态的集体理解做出有意义的贡献。
Dirichlet normal energy (DNE) is a dental topography measurement aimed at capturing occlusal sharpness and has shown promise for its ability to sort primate molars according to perceived shearing ability. As initially implemented, this measurement does not differentiate concave versus convex contributions to surface sharpness. This is problematic because the DNE-signal derived from concave aspects of an occlusal surface measures a sharp ‘edge’ oriented inward towards the enamel dentine junction rather than outward towards food contact. The inclusion of concave DNE in dietary analyses of molars possessing deep occlusal sulci–such as those found among hominoids–inflates the perceived functional sharpness of these teeth. Concave-inflated DNE values can be misleading, being interpreted as indicating that a particular taxon is more adapted for processing fibrous food than is warranted. The modification of the DNE measurement introduced here ‘Sign-oriented DNE’ alleviates this problem by elimination of concave sharpness from analyses, allowing investigations to focus on features of occlusal surfaces plausibly linked to shearing, cutting, or shredding of food materials during Phases I and II of the masticatory power stroke. Convex DNE is just as effective at sorting non-hominoid primate molars into traditional dietary categories as the initial applications of the orientation-blind version of the measurement, and produces more theoretically coherent results from hominoid molars. Focusing on- and improving the connection between measurement and occlusal function will enhance the ability of dental topography to make meaningful contributions to our collective understanding of species’ dietary ecologies.
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