Obturation
Why to Obturate?
Goal of 3D obturation
To achieve a fluid-tight seal throughout the entire root canal system.
Objectives of Obturation
1. Prevent coronal leakage:
Block microorganisms and nutrients from entering and surviving in
the root canal.
2. Confine residual microorganisms:
Trap any remaining microbes after cleaning and shaping to stop
their multiplication and pathogenic effects.
3. Block periapical fluid percolation:
Prevent fluids from the periapical area from entering the canal and
nourishing residual bacteria.
Armamentarium for Obturation
1- Paper Points Taper 2 #(15-40)#(45-80).
2- Gutta Percha Taper 2 #(15-40)#(45-80).
3- Auxiliary Gutta percha #25 Taper 2.
4- Spreader (30,35,40).
5- Condenser.
6- Torch.
7- Sealer (zinc oxide &eugenol or Adseal ).
8-Tweezer with lock.
GUTTA PERCHA
Auxiliary GP
Absorbent Paper Points
TWEEZER
WITH LOCK
SPREADER
CONDENSER
TORCH
Endodontic sealer
Steps of Obturation
1. Apical Stop Test (Resistance Form). (Apical Gauging)
2. Master cone selection and confirmation.
3. Spreader selection (30,35,40) shorter 2 mm from W.L.
4. Canal Dryness.
5. Sealer Application.
6. Master Cone Placement.
7. Auxiliary cones placement.
8. Remove excess gutta-percha.
9. Final compaction.
10.Verification.
1.Apical stop test
In a properly prepared root canal, the apical seat is a
constriction or a definite stop at the apical (end) portion
of the canal, preventing overfilling and providing a
barrier for the filling material.
➢ Apical stop: a barrier which cannot be penetrated.
➢ Apical seat: lack of a complete barrier, but the presence
of a constriction.
➢ Open apex: resembles an open cylinder, will not confine
material to the canal space.
Pathways of the Pulp and reinforced in
AAE’s Colleagues for Excellence:
Obturation publication
Apical Stop Test
(Resistance Form)

Overextended and poorly condensed gutta-percha root filling
2.Master Cone Selection
1. Choose a gutta-percha cone with the same
diameter as the master apical file.
2. Ensure there is tugback sensation at the working
length.
3. Notch the cone at the reference point (e.g.,
incisal or occlusal edge).
4. Confirm fit using a radiograph.
Schilder’s 1967
2. If Cone Fit is Not Ideal:
1. Short of working length:
Check for debris, ledges, or canal curvature
and manage appropriately.
2. Beyond the apex:
Choose a larger cone or trim the current cone
to fit.
3. S-shaped appearance on X-ray:
Indicates cone is too small → select a larger
cone.
3. Spreader Selection
Taper
2
1-The Spreader should be Short 2 mm from W.L
2- the spreader size selection
(#30, #35, #40)
# Selection Criterion Detailed Explanation
1 Spreader Taper and Size The spreader should closely match the canal’s final preparation taper and apical size. Ideally, it should be 1
size smaller than the master cone, allowing it to slide passively without binding.
2 Spreader Penetration
Depth
The spreader must reach within 1–2 mm of the working lengthto effectively compact gutta-percha
apically. Shallower penetration leads to poor seal and voids.
3 Spreader Material (SS
vs. NiTi)-NiTi: Flexible, ideal for curved canals. -Stainless Steel: Rigid, suited for straight canals. Material selection reduces the risk of ledging or
overpressure.
4 Fit Alongside Master
Cone
The spreader should passively fit alongside the master cone without displacing it apically or distorting its
shape.
5 Canal Shape and
Anatomy
Spreader selection depends on canal curvature, taper, and size. Curved or narrow canals require finer and
more flexible instruments (e.g., NiTi).
6 Insertion Resistance The spreader should insert and withdraw with minimal resistance. Excess force indicates poor fit and can
risk root fractureor misplacement.
7 Accessory Cone
Compatibility
The accessory cones should match the space created by the spreader (same ISO size). They must reach the
same depth as the spreader to ensure a dense fill.
8 Canal Curvature-Straight canals→ SS spreaders acceptable. -Moderately to severely curved canals→ Use NiTispreaders for better adaptation.
9 Root Wall Thickness In teeth with thin dentin wallsor resorbed areas, select fine or NiTi spreadersto avoid stress and
minimize fracture risk.
10 Clinical Access and
Ergonomics-Short finger spreaders (21 mm)are ideal for posterior teeth and limited access. -Pre-bent SS spreaderscan help in off-angle or difficult access cases.
Evidence-BasedCriteriaforSpreaderSelectioninEndodonticObturation
Berry et al., 1998,JOE
➢ Perform more Coronal Flaring if the spreader is not 2mm
shorter of the working length
Torabinejad & Walton, 5th ed
4.Canal
Dryness
5.Sealer Application
1. Apply endodontic sealer inside the canal.
2. Using a Lentulo spiral.
3. Using the master gutta-percha cone
itself
6.Master Cone Placement
:
1. Coat the premeasured master gutta
percha cone
with sealer.
2. Insert the cone into the canal to working
length.
7.Auxillary cones placement
7. Lateral compaction of the master
cone and creating a space in one
direction for Auxillary cones insertion
Insertion of the Auxillary cone in
the space created by the spreader
Lateral compaction the
Auxillary cones.
• In lateral compaction of gutta
percha, cones never fit as
homogenous mass, sealer
occupies the space in the
between the cones.
8.Remove excess gutta-percha
• Use a heated instrument to remove any excess gutta-percha.
9.Final compaction
Use a plugger to compact the
gutta-percha and ensure a tight
seal.
10.Verification
Verify the obturation is complete and the canal is well-filled by taking
postoperative radiograph
Post Obturation Radiograph


Grossman's Endodontic Practice - 13th edition
Clinical Hints and Tips to Avoid
Obturation Mishaps
• Preoperative assessment
It is important to identify preoperatively any neural structures or proximal risk to anatomical structures such as the maxillary
sinus in relation to the tooth undergoing endodontic therapy. Consider referral when warranted.
• Working length determination
Working length is essential and maintaining an apical foramen as small as possible is important during the cleaning and
shaping procedures.
• Resistance form
Tapered preparations should be created to ensure that an apical stop has been created to limit extrusion of material beyond
the confines of the canal.
• Technique used
The final obturation technique selected should bear in mind any anatomical constraints such as resorptive defects that may
increase the likelihood of overfilling. In general, cold lateral techniques will lead to the least risk of extrusion compared to
warm vertical compaction.
• Sealer volume
Should be kept to minimal not only to prevent long-term risk of dissolution and shrinkage but also the immediate risk of
extrusion and complications