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Methods: The root canalroot canal orifice burs and helical drilling bits were prepared in advance.
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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An evaluation of the cutting efficiency and duration of four kinds of diamond burs
四种金刚砂钻针切割效率及耐用性的比较研究
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