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.
目的对逐步后退法、逐步深入法、被动逐步后退法（超声波与手用器械联合应用）三种不同方法预备后牙细弯根管的根管清理能力及操作时间进行比较研究。 返回 passive step-back technique