论文部分内容阅读
有一次,两架飞机在大西洋的加那利群岛机场相撞,造成577人死亡。其中,美国死亡326人。面对残缺不全、血肉模糊的众多尸体,美国专家利用牙齿最终辨明并确认了212名美国死难者的身份。牙齿怎么能“验明正身”呢?原来,牙齿是人体中最坚硬的活体器官,它从外到内由牙釉质、牙本质、牙骨质及牙髓腔中的牙髓构成。其中牙釉质是牙冠最表层的半透明、高度钙化的坚硬组织,硬度比钢铁还硬,仅次于金刚石。加之其对外界刺激的耐受性较强、变化较为缓慢,即使肉体消亡,牙齿也能长久保存。因此,牙
On one occasion, two aircraft collided at the Atlantic airport of Canary Islands, killing 577 people. Among them, 326 people died in the United States. Facing incomplete and bloody bodies, U.S. experts finally used teeth to identify and confirm the identity of 212 U.S. victims. How can the teeth “identify the body?” It turned out that the teeth are the most rigid living body in the human body. It is composed of enamel, dentin, cementum and pulp in the pulp cavity from the outside to the inside. The enamel is the translucent, highly calcified, hard tissue on the surface of the crown, harder than steel, second only to diamond. In addition, its tolerance to external stimuli is strong and its change is slow. Even if the body dies, the teeth can be preserved for a long time. Therefore, teeth