手用不锈钢K型锉和机用镍钛锉ProTaper清除根管玷污层扫描电镜比较研究
수용불수강K형촤화궤용얼태촤ProTaper청제근관점오층소묘전경비교연구
Study of effects on clearing smear layer with stainless steel hand K-file and nickel titanium file ProTaper during canal preparation by SEM
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