0099-2399/96/2208-0406503.00/0
JOURNALOF ENDODONTICS

Copyright © 1996 by The American Association of Endodontists

Printed in U.S.A. VOL. 22, NO. 8, AUGUST1996

Canal Transportation Caused by a New Instrumentation Technique and ThreeStandard Techniques
Benjamin Brisefio Marroquin, DDS, Alexander Pistorius, DDS, and Brita Willershausen-Z6nnchen, DDS

The ability of three different enlarging techniques (balanced force concept, step-back, and recapitulation) and a prototype system tomaintain the original canal path during root canal preparation were compared, in vitro, with a theoretical ideally prepared root canal. Measurements were made at the concave and convex sides of the canal at four different levels (1, 4, 5, and 7 mmfrom apical, respectively). Simulated root canals embedded in clear casting resin and an enlarging computersupported device were used for this study. The results showed that none of the enlarging techniques used in this study was able to prepare a canalideally. The prototype system, at level 1, showed an ideal amount of material removed from the concave side and less, in comparison with the other techniques, from the convex side of the canals. The same tendencies persisted at all levels, with theexception of the level 4 concave side.

developed the Flex-R files to be used with the balanced force concept technique. They recommend clockwise and counterclockwise movements in the root canal to avoid the formation of ledges and to attainsuitable debris transportation in a coronal direction. Wildey and Senia (8) developed the Canal Master "U" System to be used with modifications of the step-down and step-back techniques. It is said that apical transportation is minimized through instrumentcutting segment reduction. A new root canal preparation system, which seeks the avoidance of ledging of the apical third, was presented a short time ago (9). However, research evidence that supports the theory postulated in this study has not [continua]

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