Microradiographic aspects of the growing mandibular body during permanent premolar eruption in the dog.
Microradiographic aspects of the growing mandibular body during permanent premolar eruption in the dog.
复制标题
狗永久前磨牙萌出过程中下颌体生长的显微放射学方面。
DOI：
10.1111/j.1600-0722.1998.tb02210.x
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发表时间：
1998
影响因子：
1.9
通讯作者：
A. Dhem
中科院分区：
文献类型：
--
作者：
C. Pilipili;M. Goret;A. Dhem
为探讨前磨牙功能性萌出过程中下颌骨体的变化，对18只8 ~ 16周龄的犬，在实验开始时腹腔注射土霉素（50 mg/kg和35 mg/kg，2 wk后注射），2 wk后腹腔注射茜素红S（70 mg/kg）。显微放射照相和荧光显微镜研究表明，牙槽骨隐窝壁的变化受到它们周围生长的牙胚的影响。颈部的体积减少，这表明冠形成的结束，诱导板层，然后编织骨对相邻的牙槽壁。此外，随着牙冠咬合移位，牙齿下方的空间立即被编织骨小梁和软骨样组织填充。当牙齿萌出的速度大于牙根生长的速度时，在牙槽骨基部水平也观察到同样的现象。在前磨牙发育过程中，牙胚的变化引起相邻牙槽骨壁的适应性变化，下颌骨的横向生长具有与骨干生长相同的特征。
In order to explore the bony changes in the mandibular body during prefunctional intraosseous eruption of premolars, 18 dogs aged from 8 to 16 wk at the beginning of experimental period, were given two intraperitoneal injections of oxytetracycline (50 mg/kg and 35 mg/kg 2 wk later) and 2 wk later a final injection of Alizarin red S (70 mg/kg). Microradiographic and fluorescent light microscopy studies showed that changes of the alveolar bony crypt walls were influenced by the growing dental germs which they surrounded. The cervical volumetric reduction, which indicates the end of crown formation, induced the apposition of lamellar and then woven bone on the adjacent alveolar walls. Furthermore, with occlusal displacement of the dental crown, the space below the tooth was immediately filled with woven bone trabeculae and chondroid tissue. The same phenomenon was observed at the level of the alveolar base, when the speed of tooth eruption was greater than that of root growth. During premolar development, the changes in the dental germ produces accommodating changes in the adjacent alveolar bone walls, and mandibular transversal growth has the same characteristics as that of a growing diaphysis.