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I am pretty excited to talk to you about canal preparation listen the scene of coronal excellence
was glide path management but its quite easy to shape canals that you own so there's a
lot of exciting things that happening in shaping and I am probably thinking if you are like
most dentists I interact with about 10,000 of them a year you're telling me that you
are overwhelmed and yesterday's new instrument is already in the waste basket and there's
over currently 30 systems in the world today so of course you are confused and I stand
in your shoes with compassion because I am confused I'd rather you get really good at
a couple of things then try to jump from file to file we need to look in the mirror and
sometimes remember it's not the ball it's the foot that's what they say in Latin America
anyway and in the United States we would say it's not the batter no it's not the bat it's
the batter was fooling you there for a minute wasn't I but in any event if you can get a
system down and that will follow the glide path on a reproducible basis shaping becomes
quite efficient very very safe and with an economy of instruments lets look a little
further well many of you have understood over the years that Ruddle at least for the last
decade I've been out there advocating Protaper it's currently by far the number 1 system
in the world and there's an old expression models success success leaves clues so we
have this system taught in over 960 dental schools to undergraduates around the world
and it's primarily because in the fewest number of instruments you can get a preferred deep
shape so on the left you see three instruments and the third one on the left is just a little
short one that's one we looked at just a little bit earlier remember we used that to expand
the orifice and begin to remove triangles of dentin that's the shapers on the left and
the finishers on the right really to summarize it all there's increasing percentage tapers
on the shapers which means the instruments cut in selective areas and dominantly you
can begin to appreciate the importance of a glide path because the end of those shaping
files steer the instrument through the curvatures and the work load is pushed up to the bigger
stronger more efficient blades that's quite different than other file systems in the world
today so we are cutting and shaping immediately in the upper two thirds of the canal the finishers
have decreasing percentage tapers because if you ran a fixed taper for example of eight
percent out over the active portion you would have a giant Sequoya tree it would be stiff
and not only would it be stiff it would blow out a lot of roots so by decreasing the percentage
taper two important things happen we increase flexibility and we conserve precious lateral
dentin that's Protaper so if we just looked at it briefly in a clinical op we just just
see a shaper coming in here but I wanna really emphasize brushing you tell brushing to the
masses and the masses are doing a little brushing but they're really not brushing brushing makes
the lateral space that allows the finisher to move right through the upper two-thirds
and do a little job towards its terminal extent when you pull out these finishers they're
often loaded with debris there will be a lot more to talk about finishing criteria well
well shaped canals are a great opening for disinfection but wait a minute I almost forgot
we have a post-op film this isn't complicated this is simple kinds of shapes not so complicated
little bit of curvatures you can see some anastomosis may there's a little off shoot
in the mesial root but big deal clean shapes that can be achieved through glide path management
and shaping concepts