Endo Flashcards
What is the risk of accessing through existing crowns?
Higher risk of perforation as tooth alignment may be altered by the crown
How can you reduce risk of perforation?
carefully assess pre-tx radiograph
Why would you remove a crown for RCT treatment?
defective/caries
assessment of remaining tooth
visibility & accessed improved
avoid risk of perforation
What process is used to remove a crown?
Sectioning
What bur would be used to remove a porcelain crown?
Diamond
What bur would be used to remove a metal crown?
Tungsten carbide
Name 2 crown removers
Crown tapper
Kavo Coronaflex
Name 2 crown removers
Crown tapper
Kavo Coronaflex
What are the 2 main techniques of post removal?
ultrasonic energy
post pulling devices
What should you always warn pts before post removal?
Risk of root fracture
What frequency of ultrasonic is used for post removal?
pizoelectric 30-40 Hz
Do US tips for removal have a sharp or blunt end?
Blunt
How would you remove a screw type active post?
- remove core material w/ high speed & ultrasconic
- use wrench supplied by manufacturer for insertion
- ultrasonic can aid to break cement
How would you remove a cast post & core?
- remove coronal restoration
- cut back core w/ tungsten carbide
- use ultrasonic
Which canals are hardest to remove cast post & core from?
oval shaped canals
Name 4 types of post pulling devices
Egglers post pulling device
Ivory miniature post puller
Ruddle post pulling kit
Massarann kit
Which types of cements make retrievability of posts difficult?
adhesive resin cements
What would you use to remove a quartz fibre post?
RTD fibre post removal
Name 4 root filling materials that could require removal
Gutta Percha
Carrier based systems (thermafill & guttacore)
Silver points
Endodontic pastes
Name 4 methods of removing gutta percha
Rotary files
Ultrasonic
Heat
Solvents
What speed & torque would you use rotary protaper retreatment files?
600 rpm, 4 Ncm
What material are Hedstrom files made of?
Stainless steel
When would you use Hedstrom?
Poorly compacted GP
Single core obturation
Name 5 solvents for GP
Chloroform
Turpentine
DMS W (eugenol)
Endosolv R (resin)
Endosolv E (eugenol)