2020 年 11 巻 1 号 p. 24-27
An important point for disinfection of the root canal system is root canal preparation following the original canal. Negotiating and cleaning the original canal can prove difficult when the canal has been altered in previous treatments. In retreatment cases, dentists need so long time to negotiate the original canal by hand files. In this case report, the rotary device (TriAuto ZX2) was used to negotiate the original canal in the ledged canal. This step of negotiation was performed entirely under microscope, to minimize treatment time. This technique appears useful for root canal treatment.