Скачать или смотреть negotiate severely calcified root canals with OneG

Pt was refered to me for the treatment of upper left first premolar.
Pt's dentist said he couldn't locate canal orifices.
I prefer to use FG round bur to locate canal orifices.
But It can be done only under dental microscope.
Without microscope, FG bur may perforate pulpal floor.
Once the canal orifice is located,
OneG can used to negotiate the calcified root canal.
We can use OneG without prior use of SS hand file.
But It's safer to use SS hand file first.
After making a glide path with OneG,
I shaped coronal 1/3 of root canal with OneFlare,
followed by OneCurve(#25/06 taper) for the shaping
of middle and apical 1/3.
I felt heavy load on OneCurve duing shaping,
So changed OncCurve to TS1(#25/04 taper)
and finished apical preparation.