The third group were prepared using the stainless steel hand K-files with the step-down technique(SS group).

不锈钢K锉组（SS）采用常规手用不锈钢K锉、逐步后退法预备根管。

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Nailing down the technique for the detection of water is a key step toward finding Earth-like planets that have water and other key life-related molecules, Deming said.

戴明指出，确定水的探测技术是发现类地行星的关键步骤，这种行星可能拥有水和其他与生命相关的重要分子。

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Conclusion it is better apical sealing ability in root canals prepared by crown-down technique than step-back technique.

结论短期内冠根向预备技术比逐步后退技术成形的根管更有利于根管充填后根尖孔的密封。

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