以下为句子列表：
英文: Methods: The root canal with root canal orifice burs and helical drilling bits were prepared in advance.
中文: 方法：采用根管口台阶状车针与螺旋型根管钻组合起来扩大根管。
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英文: Objective: To introduce a new prefabricated post-and-core system, a helical drilling bit and a prefabricated post-and-core consisting of a root canal orifice bur which was designed by the author.
中文: 摘要目的：介绍一种由螺旋型根管钻、自行设计的根管口台阶状车针、预成桩核组成的预成桩核系统。
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英文: Applied anatomy on shape and location of root canal orifice in maxillary first permanent molar
中文: 上颌第一磨牙根管口形态、位置的应用解剖
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