| 摘要 |
A dental blank of the present invention has at least an inner zone (or la yer) of a first color and an outer zone (or layer) of a second color wherein the inner and outer zones are concentric The inner zone can be surrounded i n its entirety by the outer zone such that only the outer zone is visible on all surfaces of the blank and the inner zone is not visible on any surface of the blank Alternatively, the inner zone and the outer zone can extend to a same single surface of the blank, such that only the outer zone covers all remaining surfaces The dental blank may also have an intermediate zone betw een the inner and outer zones, wherein the intermediate zone is surrounded i n its entirety by the outer zone and/or the intermediate zone surrounds the inner zone in its entirety. |
