1.K files for glide path development and determinethe working length
2.R25:ONLY ONE FILE perform a circumferential brushing movement, and the movement should not exceed 3 mm each time.
R40/R50:ONLY ONE FILE reach full working length and perform a circumferential brushing movement.
3.Clean the grooves and irrigate the root canal. Afterwards continue with step 1-3 until full working length has been reached
R25: For narrow canals
If the canal is partially or completely invisible.
R40: For medium canals
If the canal is completely visible and hand file #20 K moves freely to working length but #30 can’t.
R50: For wide canals
If the canal is completely visible and hand file #30 K moves freely to working length.
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