CANAL TRANSPORTATION CAUSED BY A NEW INSTRUMENTATION TECHNIQUE AND 3 STANDARD TECHNIQUES

The ability of three different enlarging techniques (balanced force co ncept, step-back, and recapitulation) and a prototype system to mainta in the original canal path during root canal preparation were compared , in vitro, with a theoretical ideally prepared root canal. Measuremen ts were made at the concave and convex sides of the canal at four diff erent levels (1, 4, 5, and 7 mm from apical, respectively). Simulated root canals embedded in clear casting resin and an enlarging computer- supported device were used for this study. The results showed that non e of the enlarging techniques used in this study was able to prepare a canal ideally. The prototype system, at level 1, showed an ideal amou nt of material removed from the concave side and less, in comparison w ith the other techniques, from the convex side of the canals. The same tendencies persisted at all levels, with the exception of the level 4 concave side.