MECHANICAL OBJECTIVES 1. Develop a continuously tapering conical form in the root canal preparation. The final preparation of this system should be an exact replica of the original canal configuration in shape, taper, and flow only larger. Only too often, canals are simply “bored out” with the clinician failing to consider the spatial relationship of the canal to the overall root anatomy. 2. Prepare a sound apical dentine matrix at the DC junction. This provides the resistance form to the intraradicular cavity preparation. This also prevents the overextension of instruments and controls the apical movement of gutta-percha sealer during obturation.
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