MTWO镍钛根管预备系统
MTWO nickel-titanium instruments
犯罪预备心理
mentality in preparation for crime
根管预备
root preparation
root-canal preparation
canal preparation
root eanal prepared
Root canal preparation
Irrigating root canal preparation
Instrumented root canal
root cancal preparation
Root canal therapy
root canal instrumentation
根管预备器械
root canal preparation instrument