open sea

Chapter 1527 Minerals
Chen Mu reckoned that even if King Lu wanted to break his head and lose the two miniature lady-carving teeth in his mouth, he would never think that Wanli asked him to come to Asia to study.

But having said that, this was the first time Chen Mu saw someone filling his mouth with ivory.

Dentistry is not a product of the new era, but it does not have a separate branch, and it belongs to a large clinic in Chinese medicine.

The earliest understanding of dental caries in the Central Plains was found in more than [-] pieces of oracle bone inscriptions unearthed in the Yin Ruins in the [-]th century BC. There is a distinction between "tooth" and "caries".

However, tooth fillings were not available until the Han Dynasty. At that time, elm bark, osmanthus and other medicines were used to fill teeth instead of solid materials. Zhang Zhongjing was also first-class in root canal treatment to kill nerve cords.

The real tooth filling will have to wait until the Tang Dynasty.

It is recorded in the official herb "Xinxiu Materia Medica" of the Tang Dynasty that the tooth filling material is composed of white tin, silver foil and mercury, and the missing tooth is as hard as silver.

This technology is also called silver amalgam dental filling. It has been used until the early 90s of last century, and it is still used on a large scale in my country. It is still used in some parts of the world until the 21st century, such as low-income people in the European Union, because it is an insurance policy.

However, many countries have banned this material in the 21st century. Although it has not been proven to be harmful to dental fillings, mistakes in the deployment of amalgam technology can easily cause harm to dentists.

Even if not mistaken, mercury will volatilize at room temperature, which also contaminates dentists.

Of course, Mr. Lu Wang is not a low-income group, this is not suitable for him.

Silver amalgam fillings are not very good-looking, and they will turn black after a long time of use. Ordinary people only use this to fill the back teeth.

After all, this is just a joke. The real reason is that this technology is used to fill teeth. Mr. Lu Wang's tooth was broken and he needed to have a tooth implant. Even if he wanted to use silver amalgam to fill it, he couldn't use it.

He can only insert teeth. This technology was only available in the Song Dynasty. It is very popular. Silver silk, gold teeth, silver teeth, ox bone teeth and sandalwood, it is really impossible to get ivory and rhino horns.

But someone like Prince Lu who played with miniature carvings on dentures is really a rare and ruthless person.

Among other things, who can bear to eat a leek dumpling?

Chen Mu has always wanted to see it, but after coaxing King Lu for several days, this kid just doesn't eat leeks.

Not only does he not eat leeks, but he also does not eat anything that might get stuck on his teeth, and Bel loves to brush his teeth, he can brush his teeth four times a day and rinse his mouth twelve times.

Of course, bad teeth and tooth loss are major problems that plague people all over the world, and dentists are not alone in traditional Chinese medicine.

The Egyptians decorated their teeth with gold thread as early as 2000 BC. When Chen Shigong was still in Japan, he also dug up the skulls of aborigines when he was buried in anatomical experiments.

There are those who specially sharpen the teeth, grind square drill holes and inlay jade stones for decoration, and some who have lost teeth and use bone or shells to make dentures and inlay them. With the current technical conditions of the Eastern Military Government, it is impossible to carefully distinguish the true dentures of those dentures. Material.

Even the military doctor of the Kingdom of Alan mentioned the craftsmanship on the teeth in the letter sent back to the military. It was the Celtics in the past, but the technology they left behind was relatively ruthless, directly drilling a tooth with an iron nail nailed into the jawbone.

According to the analysis, the size and shape of the tooth did not match the user's other teeth. It was suspected that it was pulled out of a dead man's mouth and nailed into his own mouth.

This matter is related to eating, and eating is related to survival. Basically, the races that can survive, although their technical means have their own level, but you have the Yangguan Road and I have the single-plank bridge, and they are probably warriors who have passed this level.

Chen Mu thinks that in the whole world, he is the person who has the most right to speak about science and technology, and he is now, not the science-minded commander of Nanyang Wei many years ago, or he is now.

Now he knows too much about what science and technology are, and this thing is not so mysterious.

To put it simply, there is a need, a purpose is generated through this need, and then every possibility is tried one by one.

In the end, whether the problem can be solved and this demand can be met depends on luck to be honest.

Because he is a scientist now, when the Spanish king's envoy has arrived in Daxi Port, he has no time to go there, and his mind is full of other things.

"You should first learn blacksmithing from the masters at the clan university. What, blacksmith? Not a blacksmith, we call it metallurgy."

Chen Mu browsed through the documents on the second floor of the military government office in Mo County for a long time before finally putting the official document on the table, putting his hands in his hands and saying to Lu Wang: "This is also a credit to you, a great credit - we found the document in Mexico. A new mineral."

"Right now, I think that the most suitable teacher for the feudal lord is not in Mo County. He is in Muye and has completed a research of his own. Your Majesty should study metallurgy first, and then he will have the opportunity to participate in the research of this new material."

Lu Wang followed Wanli. Although he was only 16 years old, he was not a person who had never eaten or seen anything. He slightly raised his small chin, with a look of pride on his face, and said, "Oh, materials science, this Fan knows that in Tsinghua Garden, he checked 37 kinds of wood for the emperor, which one is the most suitable for steam warships."

"Come on!"

After all, King Lu, who was sitting on the chair, leaned forward and said with interest: "What is the new mineral that Second Uncle mentioned?"

Lu Wang's interest was good news for Chen Mu. He took an official document and pushed it across the long table, saying, "This kind of mine was actually found in Jiexian County, where the Celestial Army just landed in the New World, but at that time we thought it was It's a poor tin mine."

"Later, it was used for the production of projectiles, and it was also used for the projectiles of the inspection department's bird gunners. Because tin is lighter than lead, our flag army still uses lead bullets, which are more lethal. Only the inspection department deals with smuggling. Most merchants and robbers don’t wear armor, so it doesn’t matter if they are less powerful.”

"This year we also discovered this kind of mine in the north of Mo County. Master Zhang of the Zongshi University was originally a military craftsman. He made sailor axes and armor for people in Changsheng No. [-] shop. A kind of ore fell into the wrought iron."

"That furnace of steel was completely destroyed, and it was even worse than pig iron, which shattered when it was knocked; it was only then that we realized that there was something else in that ore besides tin."

King Lu's eyes widened: "Well, what's the use of this thing?"

"Listen to me, if you add less new ore in the steelmaking process, it will become brittle; but if you add more, the steel out of the furnace will be extremely hard and tough."

"However, at present, we don't know what the new mineral looks like after removing impurities such as tin and Japanese lead, and we don't know the composition ratio of using it to process steel, let alone what it can do-all need follow-up experiments to test. This is what the king wants to learn."

　Good morning!

　　
　
(End of this chapter)