Step-back technique; Curving root canal; root canal preparation; root canal condensation.

逐步后退法；弯曲根管；根管预备；根管充填。

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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。

youdao

This traditional technique dates back to the Ming and Qing dynasties.

这种传统技艺可以追溯到明清时期。

youdao

And, in fact there's a technique of analysis used today that's called Rutherford back scattering where people actually saw that this is a means of identifying the substance, the sample.

事实上这是现在用的一种分析技术,称作卢瑟福背散射,就是人们实际上看到的那样,这是鉴别物质样品的一种方法。

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Though the technique dates back to the 1970s, the bags have become more prevalent and their contents more elaborate in recent years.

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