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Porcelain on metal crowns is often used for back teeth. The metal gives strength and support to the porcelain but the metal layer reduces the translucency of the crown making it appear opaque and duller than the natural tooth. These crowns are normally considered cosmetically unacceptable for front teeth and unless there is a porcelain shoulder on the crown a dark line tends to develop after a few years where the tooth meets the gum.
Gold crowns may be white or gold in colour. Gold is alloyed with other metals to increase its strength, which makes it a very hardwearing restoration.
Full porcelain crowns are normally used for front teeth because they look very natural and appear slightly translucent like ordinary teeth.
The disadvantage of bridges is that the teeth either side of the space have to be crowned in order to accept the bridge. However without a bridge or implant the unsupported teeth will tend to tilt toward the gap altering the alignment of the occlusion and reducing the efficiency of the bite.
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