Technical note: Estimating original crown height in worn mandibular canines using aspects of dentin morphology,American Journal of Physical Anthropology

当前位置： X-MOL 学术 › Am. J. Phys. Anthropol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Technical note: Estimating original crown height in worn mandibular canines using aspects of dentin morphology
American Journal of Physical Anthropology ( IF 2.6 ) Pub Date : 2021-08-04 , DOI: 10.1002/ajpa.24385
Gina McFarlane ₁ , Bruce Floyd ₂ , Caitlin Smith ₂ , Patrick Mahoney ₁

Affiliation

We present a novel method to estimate original crown height (OCH) for worn human mandibular canines using a cubic regression equation based on ratios of worn crown height and exposed dentin. This method may help alleviate issues frequently presented by worn teeth in dental analyses, including those in bioarchaeology. Mandibular canines (n = 28) from modern day New Zealand and English populations were selected. Crown height and dentin thickness were measured on dental thin sections (n = 19) and the resulting (log10) ratios were fitted to a cubic regression curve allowing OCH in worn crowns to be predicted. Variation in the dentin apex position was recorded and effects of angled wear slopes investigated allowing adjusted values to be generated. Our method is trialed for use on intact and sectioned teeth (n = 17). A cubic regression curve best describes the relationship between (log10) ratios and crown height deciles (R² = 0.996, df₁ = 3, df₂ = 336, p < 0.001). No significant differences were detected between OCH estimates using our method and digitally recreated cusp outlines of the same crowns (t = 1.024, df = 16, p > 0.05), with a mean absolute error of 0.171 mm and an adjusted coefficient of determination of 0.923. Our approach offers a quantitative method to estimate the percentage of OCH remaining on worn mandibular canines, and by extension, the OCH. Our estimates are comparable to digitally recreated cusps but less subjective and not limited to crowns with minimal wear.

中文翻译：

技术说明：使用牙本质形态方面估计磨损下颌尖牙的原始牙冠高度

我们提出了一种使用基于磨损牙冠高度和暴露牙本质比率的三次回归方程来估计磨损人类下颌尖牙原始牙冠高度 (OCH) 的新方法。这种方法可能有助于缓解牙齿分析中经常出现的磨损牙齿问题，包括生物考古学中的问题。选择了来自现代新西兰和英国种群的下颌犬 ( n = 28)。在牙齿薄切片上测量牙冠高度和牙本质厚度 ( n = 19) 并将所得 (log10) 比率拟合到三次回归曲线，从而可以预测磨损牙冠中的 OCH。记录牙本质顶点位置的变化，并研究成角度的磨损斜率的影响，允许生成调整值。我们的方法已在完整和切开的牙齿（n = 17）上试用。三次回归曲线最能描述 (log10) 比率和冠高十分位数之间的关系（R ² = 0.996，df ₁ = 3，df ₂ = 336，p < 0.001）。使用我们的方法和数字重建的相同牙冠的牙尖轮廓之间的 OCH 估计值之间没有检测到显着差异 ( t = 1.024, df = 16, p > 0.05)，平均绝对误差为 0.171 mm，调整后的决定系数为 0.923。我们的方法提供了一种定量方法来估计残留在磨损的下颌尖牙上的 OCH 的百分比，进而估计 OCH 的百分比。我们的估计与数字重建的牙尖相当，但主观性较低，不仅限于磨损最小的牙冠。

更新日期：2021-10-13

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11