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ePaper created 2018-03-06, 08:52:14 | version 1.38.0
Fig. 5a Fig. 5b Fig. 5c Fig. 6a Fig. 6b Fig. 6c grammed with the angles of reciprocation and speed for the three instruments. The values of the forward and re- verse rotation are different. When the instrument rotates in the cutting direction (forward rotation), it will advance in the canal and engage dentine to cut it. When it rotates in the opposite direction (reverse rotation; smaller than the forward rotation), the instrument will be immediately disen- gaged. The end result, related to the forward and reverse rotation, is an advancement of the instrument in the canal. The angles set on the reciprocating motor are specific to the RECIPROC blue instruments. They were determined using the torsional properties of the instruments. Technique The technique is simple. In the majority of canals, only one RECIPROC blue instrument is used in reciprocation to complete the canal preparation without the need for hand filing or creating a glide path. The requirements for the ac- cess cavity and the straight-line access to the canals, and the irrigation protocols remain unchanged. The use of drills or orifice openers is not required prior to starting the canal preparation with the RECIPROC blue instrument. The selection of the appropriate RECIPROC blue in- strument is based on an adequate radiograph just as shown on graphics (Fig. 4). If the canal is partially or com- pletely invisible on the radiograph, the canal is consid- ered narrow and RECIPROC blue 25 is selected (Figs. 5a–c). In cases where the radiograph shows the canal clearly from the access cavity to the apex, the canal is considered relatively large (Figs. 6a–c). A size 30 hand in- strument is inserted passively to the working length (ver- ified with an apex locator) with a gentle watch-winding movement, but without a filing action. If the file reaches the working length, the canal is considered large, and RECIPROC blue 50 is selected for the canal preparation. If the size 30 hand file does not reach the working length passively, a size 20 hand file is inserted passively in the canal. If it reaches the working length, then the canal is considered medium in size and a RECIPROC blue 40 in- strument is used for the canal preparation. If the size 20 hand file does not reach the working length passively, RECIPROC blue 25 is selected. Before commencing preparation, the length of the root canal is estimated with the help of an adequately exposed and angulated preoperative radiograph. The silicone stop- per on the instrument is set at two-thirds of that length. RECIPROC blue is introduced into the canal with a slow in and out pecking motion without pulling the instrument completely out of the canal. The amplitude of the in and out movements (pecks) should not exceed 3–4 mm. With this flexible instrument, only very light pressure should be applied. The instrument will advance easily in the canal in an apical direction and should not be forced forward. Af- ter three pecks, or if resistance is encountered before the three pecks are completed, the instrument is pulled out of the canal to clean the flutes. A size 10 hand file is used to check patency to two-thirds of the estimated length. The canal is copiously irrigated. The RECIPROC blue instru- Fig. 4 roots 1 2018 29