IRRIGANTS
Volume of irrigation – must be used in copious amount - most important factor
Irrigants reduce the surface tension in the canal.
NaOCl, EDTA, H2O2, CHX, MTAD, Urea Peroxide
1. SODIUM HYPOCHLORITE
¤ Most widely used irrigant
¤ Most effective irrigant
¤ 5.25% conc. – market 5% available
¤ Adv / properties
1. it has disinfectant & effervescent*
2. Tissue dissolvent – coagulation of protein
3. Antimicrobial properties
¤ Disadv – does not remove smear layer
¤ NaOCl Accident- toxic to vital tissue- always use rubber dam
¤ Don’t push apically- Periapical damage due to the tissue dissolving property
SMEAR LAYER –
- Layer seen on the dentinal walls after cavity prep or BMP
- Contains salivary proteins from mouth, fresh–cut dentine debris from debridement, bacteria in the infected canal
- It closes the open dentinal tubules – occluding them thereby
- It is protective in restoration to reduce sensitivity from the chemicals in the restorative material
- But for RCT, composite, retention of the material will be affected.
