Department of Stomatology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
Immunology Research Center for Oral and Systemic Health, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
J Morphol. 2024 Jan;285(1):e21657. doi: 10.1002/jmor.21657.
Studies of teleost teeth are important for understanding the evolution and mechanisms of tooth development, replacement, and regeneration. Here, we used gross specimens, microcomputed tomography, and histological analysis to characterize tooth structure, development, and resorption patterns in adult Pelteobagrus fulvidraco. The oral and pharyngeal teeth are villiform and conical. Multiple rows of dentition are densely distributed and the tooth germ is derived from the epithelium. P. fulvidraco exhibits a discontinuous and non-permanent dental lamina. Epithelial cells surround the teeth and are separated into distinct tooth units by mesenchymal tissue. Tooth development is completed in the form of independent tooth units. P. fulvidraco does not undergo simultaneous tooth replacement. Based on tooth development and resorption status, five forms of teeth are present in adult P. fulvidraco: developing tooth germs, accompanied by relatively immature tooth germs; mature and well-mineralized tooth accompanied by one tooth germ; teeth that have begun resorption, but not completely fractured; fractured teeth with only residual attachment to the underlying bone; and teeth that are completely resorbed and detached. Seven biological stages of a tooth in P. fulvidraco were also described.
硬骨鱼类牙齿的研究对于理解牙齿的发育、替换和再生的进化和机制非常重要。在这里，我们使用大体标本、微计算机断层扫描和组织学分析来描述成年黄颡鱼 Pelteobagrus fulvidraco 的牙齿结构、发育和吸收模式。口腔和咽齿呈扇形和圆锥形。多排牙齿密集分布，牙胚来源于上皮。P. fulvidraco 表现出不连续和非永久性的牙板。上皮细胞围绕牙齿，通过间充质组织被分成不同的牙齿单位。牙齿的发育是以独立的牙齿单位的形式完成的。P. fulvidraco 不会同时进行牙齿替换。根据牙齿的发育和吸收情况，成年 P. fulvidraco 中有五种类型的牙齿：发育中的牙胚，伴有相对不成熟的牙胚；成熟且矿化良好的牙齿，伴有一个牙胚；开始吸收但尚未完全断裂的牙齿；断裂的牙齿，仅与下方的骨骼有残余附着；以及完全吸收和脱落的牙齿。还描述了 P. fulvidraco 中牙齿的七个生物学阶段。
