instrumentation of RCT

Question 1

what are the design objective of rct?

Answer 1

create continuously tapering funnel shape
maintain apical foramen in original position
keep apical opening as small as possible

Question 2

what is the apical foramen?

Answer 2

small hole at apex of tooth for bv and nerves to come in and supply pulp
-if not kept small irrigants can leak

Question 3

what is a master apical file?

Answer 3

largest diameter file taken to working length so final prepared size of apical portion of canal at working length

Question 4

what is the estimated working length?

Answer 4

estimated length for instrumentation

pre-op radiograph to determine distance between coronal reference point and radiographic apex and subtract 1mm

Question 5

what is the correct working length?

Answer 5

length instrumentation and obturation limited

found by apex location/radiograph

Question 6

describe watch winding

Answer 6

30-60 oscillation
light apical pressure
K files
small files

Question 7

describe balanced force

Answer 7

CW 1/4 turn
CC 1/2 turn
to remove dentine