Apical preparation, The coronal flaring already carried out makes access to the apical portion of the root easier, as there are no dentinal obstructions and access is more direct. Thus, once the coronal preparation is complete, flexible K-type files with safe tips may be used sequentially with the balanced force technique previously described. A size appropriate to the particular canal and the final size Gates Glidden drill is selected, perhaps a size 60,
the tip dipped into a canal lubricant, and the instrument worked slightly further into the canal. Sequentially smaller files are selected until the canal is prepared to 3 4 mm short of the estimated working length. Now the actual working length must be confirmed by one of the methods described earlier, radiograph or apex locator. Once the working length has been confirmed, the apical preparation can be completed. In narrow or
sclerosed canals the operator may prefer to take a small 08, 10 and 15 files to working length before commencing any canal preparation. The prepared canal then acts as guidance for the larger sizes. This procedure is illustrated diagrammatically in Figure 12.
sclerosed canals the operator may prefer to take a small 08, 10 and 15 files to working length before commencing any canal preparation. The prepared canal then acts as guidance for the larger sizes. This procedure is illustrated diagrammatically in Figure 12.