H锉联合回旋手机与ProFile镍钛系统拆除根充牙胶能力的比较研究
H촤연합회선수궤여ProFile얼태계통탁제근충아효능력적비교연구
A comparison of H-files with reciprocal instruments and ProFile Ni-Ti system in the Re-treatment of Gutta-percha-filled root canals
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