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The teeth and dentition of the filefish (Stephanolepis cirrhifer) revisited tomographically.
Journal of Oral Science ( IF 1.9 ) Pub Date : 2020-09-26 , DOI: 10.2334/josnusd.19-0457
Hirofumi Kanazawa 1, 2 , Maki Yuguchi 1, 2, 3 , Yosuke Yamazaki 1, 2, 3 , Keitaro Isokawa 1, 2, 3
Affiliation  

The upper and lower tooth-bearing jaws of the filefish (Stephanolepis cirrhifer) were scanned using a micro-CT system in order to address the existing gaps between the traditional pictures of the morphology and histology. 2D tomograms, reconstructed 3D models and virtual dissection were employed to examine and evaluate the in situ geometry of tooth implantation and the mode of tooth attachment both separately and collectively. No distinct sockets comparable to those in mammals were evident, but shallow depressions were observed in the premaxillary and the dentary. The opening of the tooth pulp cavity was not simply oriented towards the apparent tooth base in a direction opposite to the tooth apex. The opening was distorted basoposteriorly or basoanteriorly depending on the position of the tooth, and the edge of the pulp cavity opening was barely ankylosed; i.e. the sites of pleurodont ankylosis along the basoposterior or basoanterior edge of the opening appeared to closely match the contour of the shallow depression in the bone. These 3D findings appear to be very informative when considering the phylogeny of tooth attachment, suggesting that micro-CT would be a useful modality concurrent with or in advance of histological investigations.



中文翻译:

断层扫描重新检查了斑鱼(Stephanolepis cirrhifer)的牙齿和齿列。

为了解决传统形态和组织学图像之间存在的空白,使用微型CT系统扫描了斑鱼(Stepha nolepis cirrhifer)的上,下颌牙齿。使用2D断层图,重建的3D模型和虚拟解剖来检查和评估原位牙齿植入的几何形状和牙齿附着方式既可以单独进行,也可以共同进行。没有明显的与哺乳动物相比的明显的窝,但是在上颌前和牙齿中观察到浅的凹陷。牙髓腔的开口不是简单地在与齿尖相反的方向上朝向表观牙齿基部定向。根据牙齿的位置,开口向后或向后变形,髓腔开口的边缘几乎没有被强直。也就是说,沿着开口的后后方或后方前边缘的胸膜强直的位置似乎与骨骼中浅凹陷的轮廓紧密匹配。在考虑牙齿附着的系统发育时,这些3D发现似乎非常有用,

更新日期:2020-09-25
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