reciproc

Question 1

what are the angles of reciprocation?

Answer 1

150 CC, 30C

Question 2

what are the diameters of R25, R40 and R50?

Answer 2

0.25mm
0.40mm
0.50mm

Question 3

how to decide which size reciproc file to use

Answer 3

ISO 20 file goes passively to working length = R40

ISO 30 goes to length = R50

Question 4

how to create coronal flare with reciproc

Answer 4

• estimated working length
• fill canal with irrigant
• set stopper to 2/3 est. working length
• 3 pecks not exceeding 3mm with very light pressure
• remove and clean instrument
• irrigate
• recapitulate with size 10 (lifts debris into solution)
• stop at 2/3 working length
• measure corrected working length with size 10/15 file and apex locator
• corrected WL -0.5mm from apex locator reading

Question 5

when to finish prep using R25?

Answer 5

• if ISO size 10 file goes to working length
• if ISO 10 only goes to working length pre curved then establish glide path with ISO 15
• if ISO 15 goes to working length ( without being pre curved ) then can finish prep with R25
• if not then finish prep with hand instruments or reciproc blue

Question 6

what medicament used to help seal canals?

Answer 6

epoxy resin
- slow setting (8 hours)
- initial toxicity declining after 24 hours

Question 7

what is apical gauging?

Answer 7

• determining apical control at end of preparation

Question 8

how to apical gauge (R25)

Answer 8

• 25 k file placed in root canal
• if it binds at length then most likely binding at apex (which is what we want)
• should be just before 0 on apex locator
• if hit 0 then increase prep diameter (most likely to R40)

Question 9

what is most important aspect in regard to failure with RCT

Answer 9

coronal restoration is most important