Obturation Flashcards
Drying the canal (4)
Small tip aspirator
Coarse paper point
Fine paper points
No direct air spray
Fine paper points
Use for final WL check
Make sure the canal is not bleeding and check to make sure you are not out of the canal
No direct air spray
May create an air embolism
Painful
Clearing the canal
Clear the apical debris using a MAF at WL
Apical patency
#10 file .5 - 1mm past the apex Ensure WL and clear apical portion of canal tissue debris
Ideal sealer properties
Tackiness when mixed Hermetic seal Radiopaque Very fine powder (smooth mixture) No shrinkage No staining (silver staining) Bacteriostatic Slow setting time Insoluble in tissue fluids Non-irritating to periradicular tissue Soluble in commone solvent for removal
Zinc oxide and Eugenol Sealer
most common
Grossman’s sealer (Roths)
Resin based sealer
Resilon
EndoREZ
CaOH base sealer
Sealapex
Good to use on a retreat
* Different bugs with new infection on a retreat
Glass Ionomer sealer
Part of a system
Bioceramic
BC, MTA
Use with a really infected tooth
How to place sealer?
MAF - spin in reverse Gutta percha point Paper point Lentulo Spiral (not recommended) Syringe
Core material properties
Easily manipulated with ample working time
No shrinkage
Seals laterally and apically - conforms to canal anatomy
Non irritating to PA tissues
Impervious to moisture and non porous
Unaffected by tissue fluids - no corrosion or oxidation
Bacteriostatic
Radioopaque
No discoloration of toothSterilizable
Easily removed if necessary
Core material options (6)
Gutta percha Silver cones Paste fillers - CaOH Paste fillers -- Sargenti Paste fillers -- Russian Red Thermafil, GuttaCore
Gutta Percha
From a tree 20% gutta percha 65% zinc oxide 10% radiopacifiers 5% plasticizers
May come standardized or conventional
Silver cones
Oxidation when exposed to moisture
Do not use anymore
Sargenti
Parafomaldehyde paste
Very toxic
Illegal to use in the US
Easy to blow out the apex
Russian Red
Difficult to retreat and remove
HARD as a brick
Easy to blow out the apex
Thermafil, Gutta Core
Plastic carrier covered in gutta percha
May have a gutta percha carrier
Standardized Gutta Percha vs Conventional Gutta Percha
Standardized – Sizes 15 - 140 (.02, .04, .06 taper)
Conventional – Sizes Extra fine –> Extra large
Master cone fit
Gutta percha size the same as MAF to within .05 - 1 mm of WL
Larger and softened gutta percha
Chloropercha
May be 1 mm to 1.5 mm short
Dip in chlorophorm – let dry, push in gutta percha
Use a gutta percha one size larger than MAF
Lateral condensation:
Steps for placement
Master cone fit
Larger and soften with chloroform (optional)
Spreader placement and removal:
Creating space for accessory points
Conventional gutta percha
Within 2- 3 mm of WL
Correlate spreader and accessory point size/canal size
Place accessory point to fill space
Repeat to coronal 1/3
Sear excess with heated plugger
Vertically compact with double-ended plugger
Clean chamber with alcohol soaked cotton pellet
Techniques
Lateral compaction
Vertical compaction
