One Saturday night last month, I was chewing on a steak when an old filling was broken. All of a sudden, in addition to the steak, I had gray amalgam blocks and tooth fragments in my mouth. I felt the hole with my tongue and it looked as big as a crater. In this special issue of the Science Times, we see many ways in which technology changes the medical world. My dentist later confirmed that I have a big hole in my current molar tooth, which is too big for the filling. But the dentist said he could make a crown if I could spare an hour and put it there. An hour? What do those teeth mean? Shape hat suitable for teeth should require at least two visits? First, the dentist numbers the area and drills the teeth and archives it to make room for the Crown. He or she will then leave an impression on the teeth sent to the lab. When you wait for the Crown, the hole in the tooth is covered with temporary filling. Two or three weeks later, it arrived at the office of the dental clinic. You make another appointment. The dentist numbed the area, removed the temporary filling and glued the crown in place. Now, new technologies have produced better ways. My dentist happened to be one of about 10% people using a CAD/CAM computer Computer-aided design Assist in manufacturing crown when patient is waiting. The result is a ceramic crown that can be glued to the appropriate position. After less than an hour of your first sitting in a toothpaste chair, you\'re done. Maybe you think dentists are in the dark of technology, waving pliers and talking endlessly about fluoride. As a matter of fact, the industry has quietly accepted advanced technology, and I was lucky to find a good example by chance. The process begins in the same way as before: The area is numb and the dentist drills the teeth to form the crown. But instead of making an impression on the teeth, the dentist made a three with a micro camera Size image of drill teeth. A computer program uses it to build an image that shows how the teeth look after the Crown is in place. I can see it on the computer screen and when I leave the dentist\'s office it looks the same as mine. All the details-size and shape, small ridges and dents-are then transferred to a machine in an adjacent room that grinds the crown from a large piece of porcelain. The result is an exact replica of what I see on the computer screen. About 15 minutes later, when the Crown was ready, the dentist stuck it inside. I am very excited and will be excited to see a dentist if possible. Roddy MacLeod, vice president of Sirona, said that Sirona, a company with a 95% CAD/CAM crown market, began distributing its system Cerec in the 1990 s, adding that, the technology has been upgraded for several generations. The system costs about $100,000 for dentists. ( The company provides a dental registry provided by findcerec. com. ) Some dentists who use it, such as doctors Matthew Messina of Cleveland, a spokesman for the American Dental Association, does not charge more for CAD/CAM crowns. The market will not bear more costs, the market will not bear more costsMessina said. Still, Dr. Stephen Campbell, an oral rehabilitation expert at the University of Illinois in Chicago, said that dentists should have a business plan to recover costs before investing in equipment. For many, this may mean more charges for the CAD/CAM crown. ( The repairman is a dentist with professional training in aesthetics and restoration procedures, implants and digital technology. ) However, there are limitations in the use of this technology. I made the Crown, doctor. This is a good way to do a simple little fix, says Campbell. For example, the tooth cannot be broken under the gum line, or the scanning device cannot be carried out precisely 3-D image. Since the crown is carved with solid ceramic blocks, it cannot have complex visual nuances of real teeth. The external lab can create crowns for highly visible teeth, such as the front teeth, that look exactly the same as the real thing. They use a variety of techniques and materials, including alloys, to make a crown strong enough to withstand the pressure of the back teeth, and to be true enough in terms of coloring to be used in front teeth. But even with success in an external lab, computer systems are beginning to work. Although the patient may not be aware of this, Campbell said. Castings made of dental molds are scanned and digitized and the Central Laboratory sends back images of the Crown. A dentist may approve or request a modification. Then, using a machine that could cost $1 million, the lab made a crown that could hold broken teeth below the gum line, or fit and match the front teeth. In the past, Dr. Dentists and patients have little control over the results, Campbell said. That\'s what it is, he said. This new technology is more important for dental implants whose accuracy is crucial. The dentist first implant a artificial root on the bone, fixing the artificial tooth in the appropriate position. But it is not the same as the real root, it makes the teeth move and bend. The dentist then puts a screw into a faux tooth stub and connects it to the faux root. There is a crown on the stub. This is the best if the stub is customized The doctor designed it for the patient. Campbell said. Cooperation must be accurate. If not, parts of the implant may break and the implant may fail. These days, Dr. Almost half the people, says Campbell. Ceramic crowns and many implant stubs are made from this backthe- He encourages patients who need a crown or implant to ask if their dentist has used a crown or implant. If not, they might want to find a dentist, he said. It\'s an incredible world, he said. What they are doing is cool. A version of the article appears on the New York edition D7 page with the title: a new tooth, ordered in less than an hour. The Times reporter and reporter answered your health question. Your question | All» send practical tips, expert advice, exclusive content and a little power email to your inbox every week to help you on your run trip. Coming soon.