One way to replace a tooth is the Maryland bridge. This bridge technique was first developed at the University of Maryland, and this is where it gets the name.
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There are two main esthetic problems with a Maryland bridge, and both of them have to do with the use of the metal. The first problem is that natural teeth are translucent. Therefore, the metal backing that is bonded onto the back side of the front teeth will cause those teeth to darken slightly, and they will no longer match the color of the other front teeth. If the dentist doesn’t take this darkening into account (and very few dentists do), the false tooth that is replaced will also be slightly lighter in shade than these darkened teeth on either side.
The second problem is that the false tooth is a porcelain fused to metal tooth, and it lacks the natural translucency and vitality of your other teeth. The most esthetic false teeth are those made entirely with tooth-colored materials.
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An alternative is an Encore bridge, which is made entirely of tooth-colored materials, and so it is more esthetic.
You may also be interested to read about the ovate pontic technique, which makes it appear that the false tooth is growing out of the gum.