Endodontics - protaper Flashcards
What is the protaper filing system
sequential process which creates a reproducible shape in every canal
What are protaper hand files made of
nickel titanium
What is advantageous about the use of nickel titanium in these files
they can be strained more than other alloys before permanent deformation
useful for curved canals
What are the S files for
shaping
they are used initially used to create a great taper in the canal
What are the S files for
shaping
they are used initially used to create a great taper in the canal
What order do we use the S files in (protaper)
S1 first
S2 second
What is S1 made to prepare
the coronal 1/3
What is S2 made to prepare
the middle third
Why do the S files not prepare the apical portion
their apical portion are much less tapered and so remain passive
How many protaper files are there in the series
8 files
What motions can we use with protaper
balanced force
reaming motion
What is balanced force
put pressure and bind dentine by turning the instrument clockwise with a ¼ turn and then go anti clockwise with a ½ turn to strip the dentine
What is reaming motion
lightly engaging dentine by gently rotating clockwise by approx 90 degrees with light apical pressure until file is just snug. Then cut dentine by rotating the handle clockwise and removing it at the same time. Repeat motion 3 times before withdrawing and irrigating
What is SX
an accessory file
What is SX used for
removal of coronal dentine in canal orifice only
shouldnt need to be used most the time
When would SX be useful
in short canals where S1 will not be effective
What are the F files for
F for finishing
they prepare the apical third and are responsible for the variable taper of the canal
W
How are the F files used
they are used in sequence until an apical stop is established at the CWL
What F file can we ideally get up to
F2 is sufficient but F3 will result in improved irrigant exchange
What should be done if the canal apical diameter exceeds the F series
turn to K files
What is the sequence for protaper
K10-15 file used to irrigate and recapitulate
S1 file is then taken 2/3 into the canal to create an initial opening
SX file used to remove any ledges and widen if required
The K10-15 files are then used to take the CWL Radiograph and for an apex locator if required
S1 file is then taken to CWL until no further resistance is noted
S2 file is then taken to CWL until no further resistance is noted
F system is then use to create the variable taper, beginning with F1 and working sequentially upwards until CWL is reached
F3 and up are used only if required
Apical gauging is then carried out and corrected if there is a large patency
