passive step-back technique

常見例句

雙語例句

• Methods Forty-five mesiobuccal root canals in fleshly extracted nu a an molar teeth were instrumented by the step-back technique , the step-down technique or the passive step-back technique.
  目的對逐步后退法、逐步深入法、被動逐步后退法（超聲波與手用器械聯(lián)合應(yīng)用）三種不同方法預(yù)備后牙細(xì)彎根管的根管清理能力及操作時間進行比較研究。
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