Human teeth strength same as sharks

2021-01-20 中國網漢..

Human teeth may not match those of a tiger shark in size or number -- but they are just as strong, research has shown, Press Association reported.

Scientists made the surprising discovery after comparing the micro-structure of human and shark teeth. They found that despite the teeth of the top ocean predator being coated with super-tough enamel, they are no stronger than the average human's.

Shark teeth have an interior of elastic dentin and an outer layer of hard enamel, toughened by the fluorine-based mineral fluoroapatite.

The crystals in human teeth have a special arrangement and they are 'glued together' by proteins.

Therefore the overall strength of human teeth is on par with that of the shark's.

據英國國家通訊社報導，研究表明，雖然人類的牙齒在數量和大小方面不能與虎鯊的相提並論，但其堅硬度卻能與虎鯊媲美。

在對人類和鯊魚牙齒的微結構進行對比後，科學家驚奇地發現，作為海洋頭號捕食者的鯊魚，雖然其牙齒表面覆蓋有極堅硬的牙釉質，但其硬度也並未超過人類的牙齒。

鯊魚牙齒內部含彈性牙本質，外部覆蓋牙釉質，由於氟磷灰石的存在，使其堅硬無比。

而人類牙齒內部晶體則以特殊的方式排列，並由蛋白質「粘合」在一起。


因此，人類牙齒整體堅硬度便同鯊魚的一樣了。

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