Abstract
The effect of a new automated handpiece on the original canal shape of curved root canals was compared with conventional hand instrumentation. Forty extracted molars with curved roots were randomly divided into two groups. They were mounted in resin boxes and instrumented. Two tracings made from magnified radiographs clearly indicated the extent of the discrepancy of the initial file and the final file. Regardless of the preparation procedures, the files did straighten canals. However, preparation with the new automated handpiece maintained the original canal pathway more closely than did hand instrumentation. The effect of a new automated handpiece on the original canal shape of curved root canals was compared with conventional hand instrumentation. Forty extracted molars with curved roots were randomly divided into two groups. They were mounted in resin boxes and instrumented. Two tracings made from magnified radiographs clearly indicated the extent of the discrepancy of the initial file and the final file. Regardless of the preparation procedures, the files did straighten canals. However, preparation with the new automated handpiece maintained the original canal pathway more closely than did hand instrumentation.
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