When orthodontic treatment, now often hear to hit the nail, why do you need to hit the nail, what exactly is the nail is a thing, is when doing orthodontics, there is a concept called support resistance. What do you mean by “support resistance”? It is the device that counteracts the orthodontic force when the orthodontic force is applied. For example, if you want to use your back teeth to internalize the front teeth, the front teeth will go inward and the back teeth will go forward, so this time you need to get a bracing device to prevent the back teeth from going forward and not to move the teeth, so this time you can put the nail on the molar area of the back teeth on the alveolar bone, so that the force on the nail will directly pull the front teeth backward, and this time the back teeth will So the role of the nail actually has many, this is only one of the role. There are several types of nails, one is pure titanium, one is titanium alloy, there is a stainless steel nail, these three nails can be used in clinical practice, because after the nail, so the three-dimensional control of the teeth, the teeth, the force is very comfortable. The use of nails is very wide, for example, to internalize the anterior teeth in a lot, that is to say, it is too convex, now after the extraction of the gap, all the anterior teeth to go back, this time on the posterior teeth on the nail, in that area on the nail, not to move the posterior teeth, on the nail up, this must be played, some patients do not want to play, may not get the best results, to achieve the best results. To achieve the best results, only after the nail can do the ultimate. In some teeth, such as teeth in the upper jaw and missing teeth in the lower jaw, the teeth in the upper jaw grow into the gap below, and the teeth in the lower jaw have to be set, so a nail is put in the inner and outer edges of the teeth in the upper jaw, and then a rubber band is hung to depress the tooth. There is also an asymmetrical missing tooth, for example, there is a missing tooth on one side and no missing tooth on the other side, and you want to close the gap by pulling all the teeth in the back to the front. All in all is that there are a lot of cases are suitable for nail, but not feel terrible to play nail, in fact, the nail is very small, the longest only 11 mm, the short only 9 mm, its diameter is also very small, just a little local anesthetic, the nail twisted in on the line. There are two ways to screw in the nail, one is the self-supply type, that is, to play a nail in, first hit on the eye, and then pull it in, there is a kind of their own on the pull in. These two are very, very small surgery, and this surgery is even more comfortable than the extraction of teeth, there is no tooth extraction so large trauma, no pain at all, because the local anesthetic, then you can add force, as long as it is not infected, the right location, you can play a very good role, and this role is generally other devices can not compare, other devices are very troublesome, and no comfort, this It is very comfortable, do not be afraid to hit the nail. How to take it? Just gently twist it back, just like a screw, a twist along the way in. The reverse twist will come out, and there is no blood, and a local sterilization can be done. How long to hit the nail, depending on the patient’s condition, this is the role of this nail.