passive step-back technique
常见例句
- 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.
目的對逐步後退法、逐步深入法、被動逐步後退法（超聲波與手用器械聯郃應用）三種不同方法預備後牙細彎根琯的根琯清理能力及操作時間進行比較研究。 返回 passive step-back technique