Abstract
A flaring technique for opening the cervical portion of mesial root canals in mandibular molars prior to canal instrumentation was compared with a conventional filing technique. The experimental technique explored the canals to the foramina. The canals were then filed sequentially with #15, 20, and 25 K files only to the begining curve length. Next a #1 Peeso reamer in an engine-driven handpiece was moved down the canal to the curve length. After this initial opening, the rest of the canal was instrumented with a conventional filing technique. The roots were then sectioned horizontally every 2 mm and the thickness of the distal canal wall was measured and compared with canals filed with a conventional filing method. These data were analyzed using paired <i>t</i> tests. There was no statistical difference between the distal wall thicknesses of the two techniques. The advantages of the experimental technique are increased mechanical efficiency and better access to the apical portions of the canal.
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