guidelines for improving any technique

Our extensive testing has consistently indicated that applying the following guidelines will maximize efficiency and minimize risks.

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Zone Technique

The zone technique was designed with two objectives for minimizing file stress:

One: the canal diameter should be large enough coronal to a curvature to prevent fie engagement in that portion of the canal while instrumenting apical to the curvature.

Two: the file diameter should not be too large in a curvature to cause excessive cyclic fatigue.

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Zone Technique

Once the access cavity is prepared, use an orifice opener file to establish an easy approach to each canal. Although the 25/06 One Endo file may seem extremely large for this task, its tip will actually negotiate a size 0.15 canal and it is sufficiently rigid to apply pressure without buckling.

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Zone Technique

Determine if there is a curvature of any significance and how far the curvature is from the apex. This can be accomplished by filing into or beyond a curvature and withdrawing before passively reinserting the file. If any resistance is met during reinsertion, this position indicates the beginning of a curvature since the canal is now larger than the file.

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Zone Technique

If any resistance is met during reinsertion this position indicates the beginning of a curvature since the canal is now larger than the file. The canal portion short of the resistance defines the coronal zone and the portion beyond the resistance defines the apical zone.The length of the canal to the curvature, the coronal zone, is measured and recorded with the same importance as determining the working length

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Zone Technique

The coronal zone is a straight canal and the considerations for preventing file breakage can be easily applied. The final preparation of the coronal zone should be large enough to avoid or minimize engagement of any subsequent file and provide adequate access for obturation. A frequent mistake is to use tip diameters at the terminus of the coronal zone that are smaller at that point than the largest diameters for files used in the apical zone.

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Zone Technique

Establish the working length. 20/02 or 20/04 One Endo files with their cut-flip tips are especially good to use in reaching the apical extent of the canal.

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Zone Technique

The working length minus the coronal zone length provides the distance the curvature is from the apex, the apical zone length, and helps in determining the largest file that can be used in and beyond the curvature.

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Zone Technique

Apply the guidelines above while graduating to the largest desired canal size and shape. The canal is now ready for preparing for obturation.

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