Objective: To study clinical importance of casting pile-core crown with negative pressure suction silastic impressions and analyze reasons for the failure of routine impressions in pile-core crown.
目的：探讨铸造桩核冠常规印模过程中失败的原因，研究负压抽吸硅橡胶印模应用于铸造桩核冠的临床意义。
The requests for dry-sand, vibrating table, structure of negative pressure sanrl box and proceedings to be noticed in casting pro-cesss have been put forward definitely.
结合工厂多年的生产经验，对于砂性能、振实台和负压砂箱的结构以及负压浇注过程中的注意事项提出了明确的要求。
The requests for dry-sand, vibrating table, structure of negative pressure sanrl box and proceedings to be noticed in casting pro-cesss have been put forward definitely.
结合工厂多年的生产经验，对于砂性能、振实台和负压砂箱的结构以及负压浇注过程中的注意事项提出了明确的要求。
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