Abstract
The theoretical possibility of using a standardized endodontic preparation and obturation technique in molars was investigated by measuring the widths of the roots and root canals of 40 teeth. Providing the canals were not too curved, circular-shaped preparations might be made with acceptable frequency only in the apical 1 to 3 mm of the buccal roots of maxillary molars and at the 1-mm level from the apex in the distal roots of mandibular molars. Theoretically, this technique is not generally applicable in molars.
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