1. 测定各组铸造的精度,表面粗糙度和硬度。
Then the marginal precision of the crowns, surface roughness and hardness were measured.

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2. 目的探讨前牙根折至龈下铸造桩修复的体会。
ObjectiveTo probe casting veneer peg prosthesis for anterior remnant root.

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3. ③硬度快速包埋方法和慢速包埋方法对铸造冠的硬度影响无差别。
Hardness The hardness of quick-heating methods groups and slow-heating method groups show no significance statistical difference.

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4. 这是一种镍基软质合金,用于铸造、桥,因合金质软所以减轻对颌牙磨损,易操作。
This is a soft nickel-based alloy used for making dental crown and bridge. Since is relatively soft, it can reduce wear of paired jaw teeth. Its processing is easy.

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5. 这是一种镍基软质合金,用于铸造、桥,因合金质软所以减轻对颌牙磨损,易操作。
This is a soft nickel-based alloy used for making dental crown and bridge. Since the alloy is relatively soft, it can reduce wear of paired jaw teeth. Its processing is easy.

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6. 铸造周围组织的影像在T1、T2、PD、GRE畸变为近似圆形的低信号金属伪影,在GEEPI畸变为大范围的不规则的片状信号失落;
Metal artifact around the crown was found on all images with different size and shape. In the T1, T2, PD, GRE images, the artifacts were circular. While in the GE EPI images which were patch-shaped.

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7. 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,在3.0T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。
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.

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8. 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,在3.0T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。
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.

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