Obturation

Question 1

What is the final phase of RCT?

Answer 1

Obturation

Question 2

What is the purpose of obturation?

Answer 2

prevention of reinfection of the root canal system that has been chemo-mechanically disinfected

Question 3

What material do we use for obturation?

Answer 3

Gutta Percha

Question 4

What is the purpose of a sealer?

Answer 4

Fills the space that the solid core material (GP) cannot

Question 5

What are 4 types of sealers used in RCT?

Answer 5

1) ZOE based sealers
2) CaOH sealers
3) resin based sealers
4) bioceramic/silicate cement sealers

Question 6

What reference should be used for the GP to be used?

Answer 6

Master binding file

Question 7

What are the types of tapers of standardized GP?

Answer 7

0.02, 0.04, 0.06

Question 8

If rotary file acheives WL will GP get there too?

Answer 8

NO, may need trimming (trimming plate) or adjustments based on the scenario

Question 9

What are the 2 factors for clinical assessment of a master cone/GP?

Answer 9

reaches determined WL

achieves tugback (binding in apical portion)

Question 10

What are the 2 factors involved in the radiographic assessment of GP fit?

Answer 10

1) reaches WL
2) no criming (pig tail) of the GP point

Question 11

What is the most popular technique of Obturation?

Explain how it works?

Answer 11

Lateral compaction

single master cone/point and then using fine accessory cones and a spreader instrument. the sealer will fuse everything together.

Question 12

What are the advantages and disadvantages to the Lateral compaction technique?

Answer 12

Advantages: - simple

• does not require additional equipment

Disadvantages: - non homogenous mass

• increased sealer presence
• increased possibility of leakage

Question 13

What is another obturation technique other than Lateral compaction?

Answer 13

Warm vertical compaction

Question 14

What are the advantages and disadvantages to the warm vertical compaction technique?

Answer 14

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

Question 15

How far should you set the plugger when using the warm vertical compaction technique of obturation?

Answer 15

binding point - 1mm (plugger SHOULD NOT BIND)

Question 16

What are the 3 types of heated carries for the warm vertical compaction technique of obturation?

Answer 16

1) touch+heat
2) calamus
3) system B

Question 17

What is the process for Heat and cut using a heated carrier?

Answer 17

heat and cut the coronal GP, let cool for 5 sec, 1 sec heat and remove

Question 18

What do you do after you heat and cut the coronal GP?

Answer 18

use the largest pre-fit plugger that reaches length without binding and PACK AND CONDENSE

Question 19

When do you stop doing the heat and cut & pack and condensing during warm vertical compaction?

Answer 19

when you are 5mm from the WL

Question 20

Why do we stop the heat and cut and pack and condensing with warm vertical compaction 5mm from the WL?

Answer 20

Because just about all the apical deltas and lateral canals are within 3 mm from the apex… we want those sealed up

Question 21

What do we do after we have packed and condesned the GP for the first 5mm from the WL?

Answer 21

We Backfill; inject a warm bolus of GP into the remaining canal system

Question 22

Explain the process of Backfilling?

Answer 22

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.