... 根，基础 root 牙根钻 root bur 牙根梃子 root elevator ...
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bur beggarticks root 狼把草根
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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.
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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