不锈钢K锉组（SS）采用常规手用不锈钢K锉、逐步后退法预备根管。

The third group were prepared using the stainless steel hand K-files with the step-down technique(SS group).

youdao

不锈钢K锉组（SS）采用常规手用不锈钢K锉、逐步后退法预备根管。

The third group were prepared using the stainless steel hand K-files with the step-down technique(SS group).

youdao