obturation Flashcards
Goals of Obturation
eliminate?
seal?
success dependent on?
Eliminate ALL AVENUES OF LEAKAGE from the oral cavity INTO the ROOT CANAL SYSTEM or OUT OF the ROOT CANAL SYSTEM INTO the PERIODONTAL or ORAL TISSUES
Seal within the RC system any irritants that cannot be fully removed during canal cleaning & shaping and prevent their leakage out to the peri-radicular tissues or leakage of saliva or other contaminates into pulp system
RCT Success depends upon thoroughness of removal
of irritants and quality of seal of the canal system
including coronal restoration
obturation material
gutta percha
qualities of gutta percha
– Can be softened by?
– phases?
– deminsional change?
– sealing?
– Must consider?
– Can be softened by heat and solvents
– If heated sufficiently, will change phases
– Following softening SHRINKS
– GP by itself DOES NOT SEAL
– Must consider SEALERS
isometric forms of gutta percha
Standard of Care: RC Obturation
* Avoidance of?
* Minimal Sealer?
* under-fillings?
- Avoidance of gross overextension into the peri-apical tissues (GP and Sealer)
- Minimal Sealer beyond apical constriction
- No under-fillings in the presence of a patent canal
how is GP cone positioned (to what depth)
1mm short of exit (WL)
how should canal be filled
- Totally filled with gutta percha and
sealer (no VOIDS)
radiograph of filled canal
Radiographic appearance of a
dense filling
Acceptable Obturation Techniques:
- Cold Lateral Compaction of Gutta Percha
- Hydraulic Obt Technique
- Warm vertical compaction
bad obturation technique
carrier based techniques
chemoplasticized
custom cones/ solvents
secret to CLC-GP obturation success?
COMPACTION is the secret to CLC-GP obturation success (Fill Must be dense and free of voids and have a THIN sealer layer to be effective
WHEN ARE WE READY TO OBTURATE?
after cleaning and shaping and pt is asymptomatic
pt still in pain, obturation?
- If the patient is still in pain or the original symptoms have not abated, obturation of the RC system will NOT resolve the patient’s symptoms
what size GP cone do we use (taper)
0.4
insertion of GP cone
gently insert into wet canal (NaOCl) until R felt at apex
liquid req for master cone radiograph
marking the GP cone
Make sure the “mark” on the GP cone goes EXACTLY to your reference point (WL)
If it doesn’t, DON’T TAKE A RADIOGRAPH
evaluating master cone fit
Use MC X-Ray to evaluate MC fit
Master Cone too small radio app
– Cone is too small in diameter and distorts (crinkles) near apex.
Properly fitted cone has an intimate fit at WL with NO SPACES and no crinkling.
MC and WL
MC should not extend past working length
-When Master-Cone is inserted, it should STOP at WL.
-MC must NOT be able to be pushed beyond WL. (Tap on it to check)
If the MC is NOT TIGHT at WL or pushes longer;
GET A BIGGER MASTER CONE
Master Cone too large
– Cone is too large coronally or canal taper is insufficient and will not seat at WL Black Arrow indicates level of binding
*(MC should bind only at WL)
*Fit should be INTIMATE at WL
The Master Cone Radiograph is our last chance to:
The Master Cone Radiograph is our last chance to
correct a problem easily (without re-treatment)
Until Bio-Ceramic, Bio-Active Sealers came into play,
NO SEALER was ideal and ALL SEALERS:
SHRANK with setting
DISSOLVED In body fluids over time
DIMENTIONALLY STABLE SEALER
DIMENTIONALLY STABLE SEALER
which allows
a more efficient technique.
