Abstract : Purpose : The aim of this study was to evaluate the distance between the terminal position and anatomical apical foramen after root canal preparation using tri-auto ZX2 with two different methods : the position at ‘0.5’ and the position of 1.0 mm subtracted from ‘Apex’ as the working length.
Methods : Thirty J-shaped simulated resin canals were randomly divided into two groups (N=15 in each group). Group 1 was set at the position when the flashing bar of tri-auto ZX2 with apical action reached the level at which the word ‘0.5’ appeared on its LCD screen during root canal preparation. Group 2 was prepared with the position of 1.0 mm subtracted from ‘Apex’ as the working length without apical action. All canals were prepared with NEX files with tri-auto ZX2. The distance between the apical foramen and terminal position after final preparation was measured by stereomicroscope. The data was analyzed using Student’s t-test.
Results : The distance was 0.50±0.24 mm in Group 1 and 1.10±0.28 mm in Group 2 and the difference was significant (p<0.05).
Conclusion : The distance between the working terminal position and apical foramen after root canal preparation was significantly shorter in Group 1 than in Group 2.
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