声波器械辅助镍钛根管器械预备老年人下颌第二磨牙C形根管的观察
성파기계보조얼태근관기계예비노년인하합제이마아C형근관적관찰
Combined application of sonic and Nickel-titanium endodontic instruments for C-shaped root canals in mandibular second molars in the elderly patients
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