After opening the chamber and locating all canals, fill the access cavity with sodium hypochlorite.
Take a K10 file and insert it passively into the canal, rotating it 1/8th of a turn to the left and right. Move forward without applying pressure and stop when the file stops moving. Note this length.
Take your first instrument from the series (GO-TWO with purple ring) and prepare the channel to this length. To do this, insert the instrument in motion into the canal and move forward passively towards the apex. Move it up brushing the canal wall. Remove the file and clean the flute. Repeat this action until you have reached the desired length. Then do the same with the second instrument of the series (white ring). You have now prepared the coronal 2/3 of the canal.
Take again your K10 file and move forward passively like before. In the majority of cases, the file will reach the working length passively. Measure this length using an apex locator. If at this point you cannot reach the working length, do not force it. Remove the K10 file and prepare the canal portion obtained using your purple and white GO-TWO instruments, then repeat this step.
Prepare the canal to the working length using the whole series. Start with the purple GO-TWO, then use the white, yellow, and finally the red instrument. Irrigate well between each instrument. The mechanical preparation of the tooth is thus completed.
Class IIa medical device. Marking CE 0197. Certification body TUV Rheinland. European authorised representative: Well Kang Limited The Black Church, St. Mary’s Place, Dublin 7, D07 P4AX, IRELAND.