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Elastic Collisions: Case Study01:15

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...

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双边反向犬冲击:一个案例报告

Tzu-Yuan Weng1, Shiuan-Hui Wang1, Chih-Cheng Chen2

  • 1School of Dentistry, China Medical University, Taichung, 404, Taiwan, Republic of China.

Journal of medical case reports
|December 30, 2024
PubMed
概括

这项研究呈现了一种罕见的双边对称的,反向影响的尾犬在古代骨遗骸中发现的罕见病例. 这一发现表明,受影响的狗牙至少1500年来一直是人类的担忧.

关键词:
考古学 考古学 在考古学方面.双边影响的双边影响.牙科形光束计算机断层扫描.受到影响的上犬.全景X射线影像,可以看到.

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科学领域:

  • 古牙科 古牙科
  • 矯正牙科 矯正牙科是一種矯正牙科.
  • 人类进化人类进化

背景情况:

  • 上犬损伤可能导致缺陷并影响面发育.
  • 同时的双边冲击在临床环境中非常罕见.
  • 潜在的原因包括遗传,系统和局部因素.

研究的目的:

  • 报告一种罕见的双边对称的,反向影响的上犬病例.
  • 为了分析古代骨遗骸中的这种情况.
  • 为受影响的狗牙提供历史背景.

主要方法:

  • 对一个台湾女孩 (11-14岁) 的骨遗骸的分析,可追溯到公元440-598年.
  • 使用全景X射线和牙圆束计算机断层扫描 (CBCT).
  • 构建了一个3D头骨模型来检查受影响的狗.

主要成果:

  • 在古老的头骨中确定了双边对称的,反向冲击的尾犬.
  • 这代表了具有历史证据的罕见临床观察.
  • 这种情况至少持续了1500年.

结论:

  • 大约1500年前,受影响的狗牙已经存在于人类身上.
  • 双边对称的上大损伤仍然是一个罕见的现象.
  • 这一案例凸显了长期存在的正牙问题.