Endodontics Flashcards
what are the risks of endodontic treatment
perforation, instrument breaking, continued symptoms - RCT failure, hypochlorite acident, missed canals, trismus
what does sodium hypochlorite 2.5% do
dissolves necrotic and vital organic tissue, antimicrobial, lubricate
what does EDTA 17% do
dissolves the smear layer, inorganic tissue, lubricant, chelator, decalcifying agent (useful in sclerosed canals)
what are access cavity design principles
- allow removal of the entire contents of the pulp chamber
- allow visualisation of the pulp floor and canal orifices
- allow direct access to apical 1/3 of the canal for instrumentation
- allow retention and support of a temporary filling material - good seal
- provide reservior for canal irrigant
- be as conservative as possible
why would you use 3 file sizes larger
- remove dead pulp tissue, bacteria, and their substrates
- to increase the capacity of the canals to retain a larger amount of irrigation agent
- to prepare the canal for adequate obturation
what are the apical to coronal canal preparation methods
standardised, step back, modified step back
what are the coronal to apical canal preparation methods
step down, crown down, hybrid, double flared, modified double flare, balanced force
what are the advantages of coronal preparation first
- improves tactile sensation
- prevents pushing bacteria from the infected coronal aspect further into the canals reducing the incidence of flare ups
- allows more accurate working length determination
what are the different sealers used for obturation
resin, GIC, zinc oxide eugenol, calcium hydroxide and bioceramic
what are the different types of methods used for obturation
cold lateral condensation, single cone, warm vertical condensation, thermoplasticised GP injection, carrier-based GP
what cements are used when there has been a perforation
calcium silicate-based cements such as MTA or biodentine
