1
Q
when do we obturate
A
after disinfection and shaping of the canal
when we can achieve a dry canal
2
Q
how do we dry the canal
A
paper points
3
Q
what are the aims of obturating
A
to fill the entire pulp space
to provide a barrier for reinfection
to provide a barrier to nutrient supply from peri radicular tissue
4
Q
what are the properties of a root canal filling material
A
stable no shrinkage easy to place easy to remove biocompatible radiopauw anti bacterial long working time
5
Q
what do we need to obturate
A
GP points paper points forceps root canal sealer finger spreader
6
Q
describe the cold lateral compaction method
A
- completed cleaning and shaping
- Choose a GP point that matches to the finishing file (F1/F2/F3)
- Create a notch at the working length and grip at the WL
- Check it reaches the length
- The law few mm might require the point to bend- check there is tug back when withdrawing from the canal
- If this is achieved take a radiograph to ensure it reaches the WL- this is called the master point
- Dry the canal with PP
- Coat with a film of sealer paste and use finger spreader- ensure the stop is 1-3mm short of the WL
- Place both the finger spreader and the GP point in the canal with 15 seconds to allow for the GP to adapt and remove
- Fill the resulting space with the GP point matched and coated with sealer
- Work quickly as the space will be lost due to the recoil of the GP
- Repeat until the whole canal is filled until the spreader no longer goes further than level with the CEJ
- Take a final radiograph
- Using a heated plunger- remove XS GP and compact the coronal 1/3 of the canal
- Line the access cavity with RMGIC (fuji liner) covering the amputated GP
And finally restore the access cavity
7
Q
what problems occur
A
• 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
