Endodontic Materials Flashcards
What are the uses for endodontic instruments
Mechanical removal of soft and hard tissues
Remove MOs
Create space for disinfectcants
Create appropriate shape for obturation
How can you prevent K files breaking?
Good straight line access
Correct procedural knowledge
Gentle pressure and constant motion
Avoid rotary in curved canals
What are the components of a rotary endo instrument?
Taper - diameter change along instrument
Flute - groove to collect material
Land - surface between flutes
Cutting edge - forms and deflects dentine chips
Relief - reduction in surface of land
Helix angle - angle cutting axis forms
What are the properties of an endodontic irrigant?
Facilitate removal of debris
Lubrication
Dissolution of organic and inorganic Matter
Penetrate to Cana periphery
Kill bacteria / yeasts / viruses
Biofilm disruption
Biocompatible
Does not weaken tooth
What is good/bad about NaOCl? What’s % is it?
3% and 30ml irrigation for 10 mins after canal prep =
Has an anti microbial affect on organic material
Inability to remove smear layer alone
Possible side fx on dentine
How do you remove smear layer?
17% EDTA
Ideal properties of obturation material?
Good working time and easy handling
Seals Canal apically and laterally
Non irritant
Impervious to moisture
Does not cause discolouration
Sterile
Removeable
What is a sealer used for?
Seals palace between dentinal wall and filler material
Fills voids and irregularities in canals
Lubricates during obturation
Ideal properties of a sealer?
Good adhesion
Produces good seal
Radiopaque
No shrinkage
No staining
Bacteriostatic
Insoluble in tissue fluids
What sealer usually used?
AH plus - or other resin sealers
Epoxy resin
Slow setting of 8 hours
What is MTA? What used for?
Mineral trioxide aggregate
Used for sealing the end of root canals or used in pulp capping
