Individual variations of root morphology in the post-canine teeth of squirrel monkeys

松鼠猴后犬齿牙根形态的个体差异

• 批准号: 11640711
• 负责人: KONDO Shintaro
• 金额: $ 1.66万
• 依托单位: Showa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640711/
• 关键词: primate; new world monley; Saimiri; post-canine teeth; tooth root; interradicular dentine process; molar reduction; deciduous premolars; 小臼歯; 歯槽; 大臼歯

The morphological characteristics of the roots of the post-canine teeth of squirrel monkeys (Saimin) were investigated. Materials used were 98 skulls and their extracted teeth.Maxillary molars had three roots, two buccal and one lingual, which arose from a common root.trunk. The roots were often fused in the distal molars, with the buccal roots most often fused to each other. When the maxillary molars had three roots, the interradicular dentine process running between them was Y- or T-shaped ; when they had two roots, it was a straight line. The root structure of M3 had a more reduced pattern than those of M1 and M2.The mandibular molars had mesial and distal roots. These two roots sometimes fused completely in M3. When the fusion of the two roots was slight, it occurred on the lingual side, but not on the buccal side, and it was gutter-shaped. The gutter-shaped root was most frequently found in M2.When the mandibular molars had two separated roots, the interradicular dentine process was a straight line. Maxillary permanent premolars had the most commonly two roots, one buccal and one lingual, while in more than half of the cases P2 had a single root. Of the maxillary deciduous teeth, dp2 had a single root, but dp3 and dp4 had three roots, two buccal and one lingual. The dp4 teeth resembled M1 in both crown and root structures, but dp4 had more flared and slenderroots than Ml. Most of the mandibular permanent premolars had a single root. Of the P4 teeth, 31.6% had bifurcated roots situated mesiodistally and had a well-developed talonid. The mesial mandibular deciduous premolars had only dne root, as did their successors. The dp4 teeth had both mesial and distal roots, a pattern identical to M1.

研究了松鼠猴（Saimin）的后弹药牙齿的形态学特征。使用的材料是98个头骨及其提取的牙齿。大型磨牙具有三个根，两个颊和1个舌头，是源自一个共同的根。根通常被融合在远端的磨牙中，颊根通常彼此融合。当上颌磨牙具有三个根时，它们之间的牙齿牙齿过程是y或T形的。当他们有两个根时，这是一条直线。 M3的根结构的模式比M1和M2的模式更降低。下颌磨牙具有介体和远端根。这两个根有时完全融合在M3中。当两个根的融合很小时，它发生在舌侧，但不在颊侧，并且是天沟形的。天沟形的根最常在M2中发现。下颌磨牙有两个分离的根时，牙本质牙本质过程是一条直线。上颌永久性前磨牙具有最常见的两个根，一个颊和一个舌状，而在超过一半的情况下，P2具有一个根。在上颌落叶的牙齿中，DP2具有一个根，但DP3和DP4具有三个根，两个颊和一个舌头。 DP4牙齿类似于冠和根结构中的M1，但DP4比ML更爆发和苗条。大多数下颌永久前磨牙都有一个根。在P4牙齿中，有31.6％的分叉的根部位于中静脉内，并且具有发达的tal骨。介体下颌前磨牙和继任者一样。 DP4牙齿既具有介体和远端根，又具有与M1相同的模式。

项目成果

Kondo S., Natori M., Hanamura H, Amino S.: "An odontometrical study of the molariform teeth in squirrel monkeys(Saimiri)"J Growth. 40(in print). (2001)

Kondo S.、Natori M.、Hanamura H、Amino S.：“松鼠猴（Saimiri）磨牙状牙齿的牙测量研究”J Growth。

Kondo S., Natori M., Hanamura H: "Morphological characteristics of the roots of the molars of squirrel monkeys (Saimiri).In : Brook, A.(ed.),"Dental Morphology 2001"pp.87-100"Sheffield Academic Press Ltd.. 350 (2001)

Kondo S.、Natori M.、Hanamura H：“松鼠猴磨牙根部的形态特征（Saimiri）。见：Brook, A.（编辑），“Dental Morphology 2001”pp.87-100“Sheffield

Kondo S., Natori M., and Hanamura H: "Morphological characteristics of the roots of the molars of squirrel monkeys (Saimiri). In'- Brook, A.(ed.), "Dental Morphology 2001""Sheffield Academic Press Ltd. 87 (2001)

Kondo S.、Natori M. 和 Hanamura H：“松鼠猴 (Saimiri) 臼齿根部的形态特征。In- Brook, A.(ed.)，“牙科形态学 2001””谢菲尔德学术出版社有限公司