Obturation Flashcards
What is the final phase of RCT?
Obturation
What is the purpose of obturation?
prevention of reinfection of the root canal system that has been chemo-mechanically disinfected
What material do we use for obturation?
Gutta Percha
What is the purpose of a sealer?
Fills the space that the solid core material (GP) cannot
What are 4 types of sealers used in RCT?
1) ZOE based sealers
2) CaOH sealers
3) resin based sealers
4) bioceramic/silicate cement sealers
What reference should be used for the GP to be used?
Master binding file
What are the types of tapers of standardized GP?
0.02, 0.04, 0.06
If rotary file acheives WL will GP get there too?
NO, may need trimming (trimming plate) or adjustments based on the scenario
What are the 2 factors for clinical assessment of a master cone/GP?
reaches determined WL
achieves tugback (binding in apical portion)
What are the 2 factors involved in the radiographic assessment of GP fit?
1) reaches WL
2) no criming (pig tail) of the GP point
What is the most popular technique of Obturation?
Explain how it works?
Lateral compaction
single master cone/point and then using fine accessory cones and a spreader instrument. the sealer will fuse everything together.
What are the advantages and disadvantages to the Lateral compaction technique?
Advantages: - simple
- does not require additional equipment
Disadvantages: - non homogenous mass
- increased sealer presence
- increased possibility of leakage
What is another obturation technique other than Lateral compaction?
Warm vertical compaction
What are the advantages and disadvantages to the warm vertical compaction technique?
Advantages: single homogenous mass
- 3-D obturation of the space?
- better filling of the lateral canals and irregularities
Disadvantages: - difficulty in length control
- possible increase in fracture risk when using the plugger
How far should you set the plugger when using the warm vertical compaction technique of obturation?
binding point - 1mm (plugger SHOULD NOT BIND)
What are the 3 types of heated carries for the warm vertical compaction technique of obturation?
1) touch+heat
2) calamus
3) system B
What is the process for Heat and cut using a heated carrier?
heat and cut the coronal GP, let cool for 5 sec, 1 sec heat and remove
What do you do after you heat and cut the coronal GP?
use the largest pre-fit plugger that reaches length without binding and PACK AND CONDENSE
When do you stop doing the heat and cut & pack and condensing during warm vertical compaction?
when you are 5mm from the WL
Why do we stop the heat and cut and pack and condensing with warm vertical compaction 5mm from the WL?
Because just about all the apical deltas and lateral canals are within 3 mm from the apex… we want those sealed up
What do we do after we have packed and condesned the GP for the first 5mm from the WL?
We Backfill; inject a warm bolus of GP into the remaining canal system
Explain the process of Backfilling?
once we have reached 5mm from WL, we place the extruder tip as close as possible to the 5mm fill, extrude GP until backpressure is felt and extruder is displaced 3-4mm, then condense, then place extruder tip back against GP and let sit for 10 seconds.. continue extruding until CEJ or pulp chamber floor is felt.
