This is the first comparison case I am doing to test a new crown technology. Glidewell Labs has a new type of crown for back teeth made out of zirconia, a high strength ceramic. Like gold crowns, they are virtually unbreakable, don't require a lot of tooth height. Unlike gold crowns, they are tooth colored.
Many people know about 3M's Lava crowns. They are porcelain fused to zirconia. They are beautiful in the front, but they are expensive to produce, and the porcelain is relatively fracture prone. Few problems on front teeth, but using them on high-load molars is risky; I've actually had a couple of them break myself. In every documented case of failure, (I'm talking the published clinical studies) the outer porcelain breaks off, leaving the inner zirconia intact. So the folks at Glidewell decided to make the entire crown out of zirconia.
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