Many animals can regenerate their teeth and shed their teeth.

Losing your baby’s teeth is a strange experience. The teeth are slowly loose until their replacement is thick, more durable and permanent people. But humans are not the only animals that are capable of shedding teeth. In fact, most of the lifespan of the lifetime are two sets of teeth. And the crawling animals, embebies, fish and sharks permanently transform their teeth into their lives.

But before the teeth can be replaced, it should go through the process known as “Resource”. It includes special cells, called osteo clasters, which break the bone on the root of the tooth, which makes it loose and falls out.

So far, it has not been clear that when the ability to recover the bone on the root of the tooth has already been developed. Published in a new discovery of our team, Swiss Journal of PaulovonologyThis process begins over 380 million years.

The first fish with teeth

The first evidence of dental (rear -made animal) in any scales is in ancient armored fish, called Placoderm, which grows in Silorian and Dunnan periods (438-359 million years ago).

Placoderm’s heads and breasts were covered with bone plates, and although many hunters, scientists have long thought they lacked real teeth. Then they are found in the same tissues and the process of growth.

Most placoders have two pairs of upper bone tooth plates (known as “sprinkles”) attached to the scalp, and a pair of lower jaw (called “infranithal”), which was thought to wear to the sharp cutting edge. The arrival of Sinkotrin imaging, a powerful X -ray that can show tissue details in a lot of resolution, confirmed the presence of teeth along the bone base and pulp cavity, yet there is a lack of exterior layer of enamel.

However, scientists still thought that as the placoderm increased, the teeth were eliminating, so that many adult placoderm’s jaw bones looked like they did not have teeth.

An ancient tropical rock

Gonhindi represents an ancient Divine Tropical Reef with a rich diversity of fishes in Western Australia, which dominates many of Plakodram’s species. Many species need to distribute the same area to a rock and flourish them, they need to distribute the resources available somehow. Placoders did this only differently: One species ate different foods, or fodded in different places, or fed at different times of the day or night.

Placodrums living on the reef show a huge diversity of dentists. Dental management and shape in the mouth.

The East Menostus Reef was the largest in the placoderums, which reaches about two meters in length. As a top hunter, he gave birth to a sharp bite with two separate “fengs”. Less than half the size of the East Menositis, compaigopesses, small, pointed teeth that were used to feed invertebrates like a shrimp called arthropads.

The fish that we studied for our new study was Blairkitis. It had less flat teeth used to crush the hunting shell. These teeth showed extremely unusual arrangements: they wrapped around the bony plate. In addition, the teeth of the bilircosis had a shiny surface that looked like a lot of enamel.

How did our Placoderm re -prepare his teeth

In the early 2000s, we got two extra samples but they were actually of different sizes, and their teeth plates had different dental rows. These new patterns meant that we have found a development series, which shows how to change teeth from children to adults from children to adults.

This gave us an enclosure that the way these teeth were forming was compared to all other placoders. Instead of leaving the teeth on high dental plates, the number of teeth and teeth increased as the billers increased.

Was this an early example of this known as a whirlwind of teeth – a type of teeth – as found in kynodus, the initial shark? Or is something completely different?

Investigation Wee, we took the tooth plates to the Australian Sancutter Onsato Research Facility in Melbourne where we can find high definition imaging of tissues without damaging fossils. The results showed that, like other placoders, small teeth also had a wide open pulp cavity that was affected by bone tissues known as Dentine.

However, as the teeth age, it did not wear or fall out and it was not changed. Instead, the teeth were reused from the inside: We observed numerous small canals of blood vessels in the old teeth, which attacks a sharp bone tooth and eventually replaces the central dentine.

Under the tooth plate, according to each row of teeth, there was a new tooth sitting in the shallow pit. We have interpreted it as a soft tooth -making tissue site known as dental lamina, as is found today in bony fish like trout.

Another piece of evolution puzzle

However, we did not find it.

Many teeth of bilirchets are shown in the plates that show pits along the features related to the feature, which indicate the presence of osteo classes, the cells that break the bone.

They are not limited to a single tooth, such as living bony, ray made of fish, such as trout. Instead, they are wide across the dental plate on the outer surface. With the dramatically decreased recovery in the elderly, the amount of reserves existing is different between adults and underage children.

Placodermz, while not widely known in society, ruled the planet as the most abundant and diverse rash on the planet for more than 80 million years. Our new studies suggest that they are closer to the living bonneys than we think. And provide another piece of evolutionary puzzle about our deep -time ancestors.

This article is reproduced from the conversation under a creative license. Read the original article.