Abstract
The theoretical possibility of using a standardized endodontic preparation and obturation technique in premolars was investigated by measuring the widths of the roots and root canals of 80 teeth. Providing the canals were not too curved, circular-shaped preparations might be made with acceptable frequency in the apical 2 to 3 mm of maxillary second premolars and mandibular premolars. Theoretically,this technique is not generally applicable in maxillary first premolars.
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