Using LA Axxess Bur
1. The LA Axxess Bur should be used in a low-speed latch-type
hand piece at 5,000 – 10,000rpm.
2. Place the tip of the bur in the center of the hollow core. Activate
the hand piece at 5,000 – 10,000 RPM and drill out the core to the
desired depth using an intermittent pulsing technique. Start the
bur – press it down – stop – pull the bur back etc..., in this way
the LA Axxess Bur melts and removes the plastic core. You could
start this procedure by making a center mark with a small round
bur. The LA Axxess Burs should only be used in the top coronal
part of the filling until just below the canal opening. When using
the LA Axxess Bur, the obturator core and gutta percha will, due to
the friction heat, melt and be coiled out of the canal. However, the
plastic core will only melt to the point where the LA Axxess Bur is
placed.
3. When the desired depth has been reached using the LA Axxess
Bur, use your usual post space bur. Choose a bur dimension that
fits the post system and complete the post preparation. Other
cutting burs may be used, but care should be taken to prevent
perforation or displacement of the apical portion of the obturator
core.
3. Retreatment of an obturated root canal
Removal of the obturator is relatively simple prior to the gutta percha cooling.
Simply grasp the excess core with cotton pliers and remove it. Once the
gutta percha has cooled, or for retreatment at a later appointment, removal is
easiest achieved by using a Peeso bur, Gates, Rotary file or similar.
1. Place the selected rotary instrument between the canal wall and the
plastic core so that the rotational direction will be counter clockwise. Use
the instrument at very low speeds (250-400 rpm) and work slowly until you
feel resistance. The instrument will grasp between the plastic core and the
canal wall. The plastic core will be coiled out of the canal after a short time.
2. If necessary, a small dimension hand file can be worked down apically
along the plastic core.
3. When the plastic core has been pulled out of the canal, the gutta percha
is removed by traditional means.
Technique tips
1. Obturating multi-rooted cases
There will almost always be more than enough gutta
percha on each obturator. When obturating the canal, the
gutta percha and sealer will therefore be transported to
the coronal part of the tooth and in this way block the
opening creating a challenge when working with multiple
canals. Here is a step by step guide for obturating mul-
tiple canals.
1. Obturate the shortest canal first.
2. Place paper points or size verifiers in the other
canals prior to obturation to prevent them being cov-
ered by gutta percha. Remove them as each canal is
obturated.
3. While there is sufficient gutta percha on each obtu-
rator to fill even the most severe internally resorbed
canal, it may be too much in some cases. If it is obvi-
ous that there will be an excess of gutta percha for the
canal, use a sharp blade to trim some of the material
from the coronal end of the central core prior to heat-
ing. Care must be taken not to remove too much gutta
percha or fracture the obturator.
2. Post space preparation
Post space creation is accomplished by removing the
coronal portion of the obturation. Since the coronal 6 mm
of the plastic core is hollow, this procedure should be
easier with the Soft-Core Endodontic
Obturator than with other obturation systems.
STEP 2: Heating of the obturator
Place the selected obturator in the Soft-Core heater and activate the heater.
For more information on how to use the heater, please see section 1 of this
manual.
STEP 3: Application of sealer
While the obturator is heating, mix any heat resistant sealer with long
working time (a non-eugenol sealer is recommended). Make sure that
the root canal is completely dry, before applying sealer. Place a very thin
coating
of sealer on the wall of the canal. Too much sealer is neither desirable nor
necessary. Utilize a paper point or a Soft-Core Size Verifier
to apply a thin layer of sealer on the canal walls. When
obturating more than one canal, apply sealer in all
canals at once.
STEP 4: Insertion of the
obturator into the canal
When the oven indicates that the obturator
is ready for use, the obturator may be removed
from the heater.
Immediately insert the obturator into the
canal to the working distance, without
twisting the handle, and while using a firm
and steady pressure.
Important: The obturator should be inserted
to the full working length.
STEP 5: Removal of the handle,
excess central core and gutta percha
The handle, excess core and gutta percha may be
removed once the gutta percha has hardened.
1. For canals less than 18mm: Twist the
handle and plastic core to one side to break
off the excess.
2. For all Canals: Stabilize the plastic core
with a finger or cotton pliers, and cut away
the handle and excess plastic core with a
small inverted cone bur.
Important: Be careful to prevent vertical
movement of the core to minimize the
chance of disturbing the apical seal.
Trim away the extra gutta percha using
an endo excavator or similar instrument.
THIN LAYER OF SEALER
