Carlsen O, Alexandersen V
Department of Dental Morphology, Royal Dental College, Copenhagen, Denmark.
Scand J Dent Res. 1990 Oct;98(5):363-73. doi: 10.1111/j.1600-0722.1990.tb00986.x.
The Royal Dental College, Copenhagen, houses an extensive collection of human teeth, extracted in Denmark. At present, the collection includes 398 permanent mandibular molars with a root complex containing a lingually-located supernumerary root. This macrostructure is called radix entomolaris (RE). By analyzing the large number of available specimens it was possible to establish uniform and precise criteria for the identification of RE on M1 inf, M2 inf, and M3 inf. The analyses included separate as well as non-separate RE. The representation of the RE variants according to tooth types was mapped. Furthermore, the following relevant clinical variables with respect to RE were registered: degree of separation, divergence, apical bend, apical gracility, and fusion. Because of the nature of the material, the investigation was mostly qualitative and non-metric. The results should be of interest to clinical dentists, dental morphologists, and dental anthropologists.
哥本哈根皇家牙科学院收藏了大量在丹麦拔除的人类牙齿。目前，该收藏包括398颗下颌恒磨牙，其牙根复合体包含一个位于舌侧的额外牙根。这种宏观结构被称为磨牙内根（RE）。通过分析大量可用标本，有可能为识别M1近中根、M2近中根和M3近中根上的RE建立统一且精确的标准。分析包括分离和未分离的RE。根据牙齿类型绘制了RE变体的分布图。此外，还记录了以下与RE相关的临床变量：分离程度、分歧度、根尖弯曲度、根尖纤细度和融合情况。由于材料的性质，该研究主要是定性的且非计量的。这些结果应该会引起临床牙医、牙齿形态学家和牙齿人类学家的兴趣。
