Endodontic Materials
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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