K file number 25. what does the 25 mean?
the K file is 0.25mm in diameter at the tip
what is the colour sequence for the following K files sizes?
- 015
- 020
- 025
- 030
- 035
- 040
white yellow red blue green black
what is the colour sequence for the following K files sizes?
- 008
- 010
grey
purple
what are the 5 roles of irrigation in RCT?
- solvent
- antimicrobial
- lubricant
- remove debris
- aid in cleansing that are inaccessible to mechanical cleaning
what is the % of NaoCl used in RCT?
2.5% - 5.25%
why non-setting CaOH is a good intercanal medicament? (2)
high pH 11-12
effective bacterial agent
why Ledermix is a good intercanal medicament? (2)
- democlocycline
- triamcinolone (reduce inflammation, pain and promote healing)
what is the name of an endo explorer?
DG16 probe
name 3 aids in locating canals?
- dentine mapping
- drop of iodine (after few mins, flush with alcohol)
- fiber optics
what is the MDB rule?
when Xray beam moves MESIALLY, the BUCCAL root will be more DISTAL.
SLOB rule
name 2 canal shaping techniques.
crown down
step back
what does MAF mean in step back technique?
Master Apical File
name 2 obturation techniques.
Cold lateral compaction
Warm compaction
what are cons(2) of step back technique?
cons
- debris likely to push into radicular tissues
- WL will change after shaping curvature
what are cons(1) of crown down technique?
cons
- increased removal of dentinal tissues
Name the 2 types of warm compaction obturation technique?
lateral condensation
vertical condensation
difference between
- odontopaste (3)
- ultracal (1)
- ledermix (2)
odontopaste
- clindamycin
- triamcinolone
- CaOH
ultracal
- 35% CaOH
ledermix
- democlocycline
- triamcinolone
after RCT, how often should we take a radiograph to assess it? (2)
1 year after RCT
every 4 years after
why CHX and NaOCl should not be used together as an endo irrigant? (2)
- creates a brown precipitate
- occludes tubules, compromise seal of canals
what primary bacterias are found in periapical infections? (3)
- Streptococci, enterococci, lactobacilli
- Prevetolla
- porphyromonas endodontalis
what primary bacterias are found in failed endo cases? (3)
- E. faecalis
- Actinomyces spp
- Strep Anginosus
Canal disappears in apical 3rd on radiograph, why? (5)
- split canal
- calcification (pulp stones)
- pulp canal obliteration
- 2* dentine
- amelogenesis / dentinogenesis imperfecta
what files are used to remove gutta percha? (3)
rotary
- Gate Glidden
- D file
hand
- Headstrom
