passive step-back technique
常見例句
- 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(duì)逐步后退法、逐步深入法、被動(dòng)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(shí)間進(jìn)行比較研究。 返回 passive step-back technique