Objective To investigate the influence of three dental alloys casting crowns on the artifacts of MRI imaging during the examination of 3.0T MRI and 1.5T MRI.

目的对比钴铬合金、低钛合金及镍铬合金3种贱金属合金铸造冠，在3.0 T及1.5 T磁共振成像检查时，产生金属伪影的最大面积及伪影涉及的扫描层数。

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And quietly the trees casting their crowns.

树木将他们的王冠静静地。

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Objective To repair residual crowns and roots of anterior teeth with casting post core with metal porcelain crown.

目的探讨利用铸造核桩加金属烤瓷全冠来修复前牙残冠、残根的优点。

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