week 4

Question 1

when do we obturate

Answer 1

after disinfection and shaping of the canal

when we can achieve a dry canal

Question 2

how do we dry the canal

Answer 2

paper points

Question 3

what are the aims of obturating

Answer 3

to fill the entire pulp space
to provide a barrier for reinfection
to provide a barrier to nutrient supply from peri radicular tissue

Question 4

what are the properties of a root canal filling material

Answer 4

stable 
no shrinkage 
easy to place 
easy to remove 
biocompatible 
radiopauw 
anti bacterial 
long working time

Question 5

what do we need to obturate

Answer 5

GP points 
paper points
forceps 
root canal sealer 
finger spreader

Question 6

describe the cold lateral compaction method

Answer 6

1. completed cleaning and shaping
   
   2. Choose a GP point that matches to the finishing file (F1/F2/F3)
   3. Create a notch at the working length and grip at the WL
   4. Check it reaches the length
   5. The law few mm might require the point to bend- check there is tug back when withdrawing from the canal
   6. If this is achieved take a radiograph to ensure it reaches the WL- this is called the master point
   7. Dry the canal with PP
   8. Coat with a film of sealer paste and use finger spreader- ensure the stop is 1-3mm short of the WL
   9. Place both the finger spreader and the GP point in the canal with 15 seconds to allow for the GP to adapt and remove
   10. Fill the resulting space with the GP point matched and coated with sealer
   11. Work quickly as the space will be lost due to the recoil of the GP
   12. Repeat until the whole canal is filled until the spreader no longer goes further than level with the CEJ
   13. Take a final radiograph
   14. Using a heated plunger- remove XS GP and compact the coronal 1/3 of the canal
   15. Line the access cavity with RMGIC (fuji liner) covering the amputated GP
       And finally restore the access cavity

Question 7

what problems occur

Answer 7

• GP point gets bent 
	• No tug back 
	• GP points come out with the spreader 
	• Sealer paste sets too quickly 
	• XS pressure causes root fracture 
	• Final radiograph shows- 
	• Root filling to be short 
	• Root filling past the apex 
Voids in the canal