Endodontic Materials Flashcards
Name the functions of irrigants.
Facilitate removal of debris.
Kill microogranisms.
Lubricate canal.
Disrupt biofilm.
Dissolution of organic and inorganic matter.
Penetration to canal periphery.
What should be used to irrigate after sodium hypochlorite accident ?
Saline.
What two irrigants should be used for RCT ?
Sodium hypochlorite 3%
EDTA 17%
What is the three properties of sodium hypochlorite 3% ?
Broad spectrum antibacterial.
Ability to dissolve necrotic tissue.
Proteolytic and dissolution capacity.
What is the trade name for sodium hypochlorite ?
Parcan.
How much sodium hypochlorite should be used during RCT of one canal ?
30ml
How much EDTA should be used during RCT of one canal ?
3ml
What is the function of EDTA irrigant ?
Removes smear layer formed during tooth preparation.
What is the issue with not removing smear layer before obturation ?
Prevents sealer penetration and adequate disinfection.
What irrigant should be used to check dam integrity ?
0.2% chlorhexidine digluconate (Corsydyl).
What irrigant should be used when suspected iatrogenic damage or if sodium hypochlorite allergy ?
2% chlorhexidine digluconate.
What are the two potential causes of failure of endodontic files ?
Torsional fatigue and cyclic fatigue.
Explain torsional fatigue.
Instrument binds to dentinal walls which the other portion continues to rotate - exceeds elastic limit of the material and results in plastic deformation.
Explain cyclic fatigue.
Freely rotating in curvature generating tension and compression cycle which results in work hardening.
What are four ways which torsional & cyclic fatigue of endodontic files can be prevented ?
Creating manual glide path.
Crown-down instrumentation technique.
Do not use rotary files in curved canals.
Constant motion when using hand files.
